diff --git a/run-regression.rb b/run-regression.rb
new file mode 100755
index 0000000..b241a01
--- /dev/null
+++ b/run-regression.rb
@@ -0,0 +1,345 @@
+#!/usr/local/bin/ruby
+#----------------------------------------------------------------------
+# run-regression.rb
+#----------------------------------------------------------------------
+# Copyright (c) 2007,2008,2009 by Johan Holmberg. All rights reserved.
+#----------------------------------------------------------------------
+# @(#) $Id$
+#----------------------------------------------------------------------
+
+require "rbconfig"
+require "dbm"
+require "digest/md5"
+
+#----------------------------------------------------------------------
+
+TMPFILES = [
+  "tmp-cmdtest-2",
+  "tmp-cmdtest-2/tmp-command.sh",
+  "tmp-cmdtest-2/tmp-stderr.log",
+  "tmp-cmdtest-2/tmp-stdout.log",
+  "tmp-cmdtest-2/workdir",
+  "tmp-cmdtest-2/workdir/TIMESTAMP"
+]
+
+class ActualTcRegression
+
+    def initialize
+        @count = 0
+        @f = File.open("TC_actual-regression.rb", "w")
+
+        @f.puts [
+            "class TC_cmdtest < Cmdtest::Testcase",
+            "",
+            "  def setup",
+            TMPFILES.map {|file| "    ignore_file #{file.inspect}" },
+            "  end",
+            "",
+        ]
+
+    end
+
+    def _list_elements(level, lines)
+        lines.map do |line|
+            "  " * level + line.inspect + ","
+        end
+    end
+
+    def _indent(level, lines)
+        lines.map do |line|
+            "  " * level + line
+        end
+    end
+
+    def _gen_count
+        @count += 1
+    end
+
+    def _comment_str(lines)
+        lines.each do |line|
+            if line =~ /^#/              # ..
+                res = line.sub(/^#\s*/, "")
+                return res
+            end
+        end
+        return "no comment given"
+    end
+
+    def add(prefix, code, stdout)
+        @f.puts [
+            "  def test_#{_gen_count}",
+            "    create_file \"TC_tmp.rb\", [",
+            "      'class TC_cmdtest < Cmdtest::Testcase',",
+            "      '  def test_foo',",
+            _list_elements(3, _indent(2, prefix)),
+            _list_elements(3, _indent(2, code)),
+            "      '  end',",
+            "      'end',",
+            "    ]",
+            "",
+            "    cmd 'cmdtest.rb --quiet' do",
+            "      comment #{_comment_str(code).inspect}",
+            "      stdout_equal [",
+            _list_elements(4, stdout),
+            "      ]",
+            "    end",
+            "  end",
+            "",
+        ].flatten
+    end
+
+    def write
+        @f.puts [
+            "",
+            "end",
+            "",
+        ]
+
+        @f.close
+    end
+end
+
+#----------------------------------------------------------------------
+
+class ActualRegression
+
+    def initialize
+        @o2 = ActualTcRegression.new
+
+        @f = File.open("actual-regression.rb", "w")
+    end
+
+    def add(prefix, code, stdout)
+        prefix   = prefix.map {|line| line.chomp }
+        code     = code  .map {|line| line.chomp }
+        stdout   = stdout.map {|line| line.chomp }
+
+        @o2.add(prefix,code,stdout)
+
+        @f.puts prefix
+        @f.puts "#" + "-" * 35
+        @f.puts code
+        @f.puts "# stdout begin"
+        @f.puts stdout.map {|line| "# %s" % [line] }
+        @f.puts "# stdout end"
+    end
+
+    def write
+        @o2.write
+
+        @f.close
+    end
+end
+
+#----------------------------------------------------------------------
+
+class RegressionData
+
+    def initialize(files)
+        @lines = files.map {|file| File.readlines(file) }.flatten
+        @i = 0
+    end
+
+    def eof?
+        j = @i
+        while j < @lines.size && @lines[j].strip.empty?
+            j += 1
+        end
+        return j >= @lines.size
+    end
+
+    def skip_to(pattern)
+        # ignore return value
+        get_to(pattern)
+    end
+
+    def _show_line(i)
+        puts "%d: %s" % [
+            i,
+            @lines[i],
+        ]
+    end
+
+    def get_to(pattern)
+        res = []
+        i1 = @i
+        while ! eof? && @lines[@i] !~ pattern
+            _show_line(@i) if $opt_verbose
+            res << @lines[@i]
+            @i += 1
+        end
+        if eof?
+            puts "Error: looking at:"
+            _show_line(i1)
+            raise "eof looking for #{pattern}"
+        end
+        # get past matching line
+        @i += 1
+        return res
+    end
+end
+
+#----------------------------------------------------------------------
+
+SystemResult = Struct.new(:status, :stdout, :stderr)
+
+def my_system(cmd)
+    full_cmd = "#{cmd} > tmp-stdout 2> tmp-stderr"
+    #puts "+ #{full_cmd}"
+    ok = system full_cmd
+    status = $?.exitstatus
+    stdout = File.readlines("tmp-stdout")
+    stderr = File.readlines("tmp-stderr")
+    if status != 0
+        puts "INTERNAL ERROR:"
+        puts "STDOUT:"
+        puts stdout
+        puts "STDERR:"
+        puts stderr
+        exit 1
+    end
+    #p [:my_system, cmd, status, stdout, stderr]
+    return SystemResult.new(status, stdout, stderr)
+end    
+
+#----------------------------------------------------------------------
+
+def indented(lines)
+    lines.map {|line| "    " + line.to_s }
+end
+
+#----------------------------------------------------------------------
+
+def matching_arrays(a,b)
+    return false if a.size != b.size
+    a.each_index do |i|
+        return false unless a[i] === b[i]
+    end
+    return true
+end
+
+#----------------------------------------------------------------------
+
+$opt_verbose = false
+$opt_only = nil
+$opt_remember = false
+
+while /^-/ =~ ARGV[0]
+    arg = ARGV.shift
+    case arg
+    when "-v"
+        $opt_verbose = true
+    when "-r"
+        $opt_remember = true
+    when /^--only=(\d+)$/
+        $opt_only = $1.to_i
+    else
+        puts "Error: unknown option: #{arg}"
+        exit 1
+    end
+end
+
+ENV["PATH"] = (File.expand_path("t/bin") +
+                   Config::CONFIG["PATH_SEPARATOR"] +
+                   ENV["PATH"])
+
+files = ARGV.empty? ? Dir.glob("t/*.rb") : ARGV
+rd = RegressionData.new(files)
+
+tests = []
+
+while ! rd.eof?
+    prefix = rd.get_to( /^#----------/ )
+    code   = rd.get_to( /^# stdout begin/ )
+    stdout = rd.get_to( /^# stdout end/ ).map do |line|
+        if line =~ /^# (.*\n)/ #..
+            $1
+        elsif line =~ /^#\/(.*)/ #..
+            Regexp.new($1)
+        else
+            line                # should not occur
+        end
+    end
+    tests << [prefix, code, stdout]
+end
+
+puts "###"
+puts "### found %d tests in file." % [tests.size]
+puts "###"
+
+act = ActualRegression.new
+
+already_ok = DBM.open("already_ok")
+if ! $opt_remember
+    already_ok.clear
+end
+
+errors = 0
+iii = -1
+for prefix, code, stdout in tests
+    iii += 1
+    next if $opt_only && iii != $opt_only
+
+    digest = Digest::MD5.hexdigest([prefix,code,stdout].flatten.join)
+    if already_ok.has_key?(digest)
+        #puts "### #{iii}: %s ... [[cahced]]" % [code[0].chomp]
+        next
+    end
+
+    if code.join("\n") =~ /SKIP \s+ (\S+)/x
+        skip = $1
+        if RUBY_PLATFORM.index(skip)
+            puts "### #{iii}: SKIP: %s ..." % [code[0].chomp]
+            act.add(prefix, code, stdout)
+            next
+        end
+    end
+
+    puts "### #{iii}: %s ..." % [code[0].chomp]
+
+    lines = []
+    #lines << "require 'Test/Cmd'"
+    lines << ""
+    lines << "class TC_foo < Cmdtest::Testcase"
+    lines << ""
+    lines << "    def test_foo"
+    lines << code
+    lines << "    end"
+    lines << ""
+    lines << "end"
+    lines << ""
+    lines.flatten!
+
+    File.open("CMDTEST_tmp_regression.rb", "w") do |f|
+        f.puts lines
+    end
+
+    res = my_system "ruby -w bin/cmdtest.rb --quiet --ruby_s CMDTEST_tmp_regression.rb"
+    if res.status != 0
+        puts "ERROR: non-zero exit from:"
+        puts lines
+        exit 1
+    end
+    if matching_arrays(stdout, res.stdout)
+        already_ok[digest] = true
+    else
+        puts "ERROR: unexpected STDOUT:"
+        puts "ACTUAL:"
+        puts indented(res.stdout)
+        puts "EXPECTED:"
+        puts indented(stdout)
+        errors += 1
+    end
+
+    act.add(prefix, code, res.stdout)
+end
+
+act.write
+
+puts
+if errors == 0
+    puts "### all tests OK"
+else
+    puts "--- error in #{errors} tests"
+end
+puts
diff --git a/t/00-assert.rb b/t/00-assert.rb
new file mode 100644
index 0000000..90e45f3
--- /dev/null
+++ b/t/00-assert.rb
@@ -0,0 +1,38 @@
+#======================================================================
+# test assert
+
+#-----------------------------------
+# assert -- correct
+
+cmd "true.rb" do
+    assert true
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# assert -- incorrect
+
+cmd "true.rb" do
+    assert false
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: assertion failed
+# stdout end
+
+#-----------------------------------
+# assert -- incorrect with msg
+
+cmd "true.rb" do
+    assert false, "got false"
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: assertion: got false
+# stdout end
+
diff --git a/t/00-exit_nonzero.rb b/t/00-exit_nonzero.rb
new file mode 100644
index 0000000..d9947f1
--- /dev/null
+++ b/t/00-exit_nonzero.rb
@@ -0,0 +1,37 @@
+#======================================================================
+# test exit_nonzero
+
+#-----------------------------------
+# exit_nonzero -- correct
+
+cmd "false.rb" do
+    exit_nonzero
+end
+
+# stdout begin
+# ### false.rb
+# stdout end
+
+#-----------------------------------
+# exit_nonzero -- correct 18
+
+cmd "exit.rb 18" do
+    exit_nonzero
+end
+
+# stdout begin
+# ### exit.rb 18
+# stdout end
+
+#-----------------------------------
+# exit_nonzero -- incorrect
+
+cmd "true.rb" do
+    exit_nonzero
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: expected nonzero exit status
+# stdout end
+
diff --git a/t/00-exit_status.rb b/t/00-exit_status.rb
new file mode 100644
index 0000000..3d63947
--- /dev/null
+++ b/t/00-exit_status.rb
@@ -0,0 +1,49 @@
+#======================================================================
+# test exit_status
+
+#-----------------------------------
+# exit_status -- correct 0
+
+cmd "true.rb" do
+    exit_status 0
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# exit_status -- incorrect 0
+
+cmd "false.rb" do
+    exit_status 0
+end
+
+# stdout begin
+# ### false.rb
+# --- ERROR: expected 0 exit status, got 1
+# stdout end
+
+#-----------------------------------
+# exit_status -- correct 18
+
+cmd "exit.rb 18" do
+    exit_status 18
+end
+
+# stdout begin
+# ### exit.rb 18
+# stdout end
+
+#-----------------------------------
+# exit_status -- incorrect 18
+
+cmd "exit.rb 10" do
+    exit_status 18
+end
+
+# stdout begin
+# ### exit.rb 10
+# --- ERROR: expected 18 exit status, got 10
+# stdout end
+
diff --git a/t/00-exit_zero.rb b/t/00-exit_zero.rb
new file mode 100644
index 0000000..1c6dd37
--- /dev/null
+++ b/t/00-exit_zero.rb
@@ -0,0 +1,38 @@
+#======================================================================
+# test exit_zero
+
+#-----------------------------------
+# exit_zero -- correct
+
+cmd "true.rb" do
+    exit_zero
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# exit_zero -- incorrect
+
+cmd "false.rb" do
+    exit_zero
+end
+
+# stdout begin
+# ### false.rb
+# --- ERROR: expected zero exit status, got 1
+# stdout end
+
+#-----------------------------------
+# exit_zero -- incorrect 18
+
+cmd "exit.rb 18" do
+    exit_zero
+end
+
+# stdout begin
+# ### exit.rb 18
+# --- ERROR: expected zero exit status, got 18
+# stdout end
+
diff --git a/t/00-file_equal.rb b/t/00-file_equal.rb
new file mode 100644
index 0000000..f40adc2
--- /dev/null
+++ b/t/00-file_equal.rb
@@ -0,0 +1,161 @@
+#======================================================================
+# test file_equal
+
+#-----------------------------------
+# file_equal -- correct ""
+
+File.open("foo", "w") {}
+
+cmd "true.rb" do
+    file_equal "foo", ""
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# file_equal -- incorrect ""
+
+File.open("foo", "w") {|f| f.puts "hello world" }
+
+cmd "true.rb" do
+    file_equal "foo", ""
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong file 'foo'
+# ---        actual: hello world
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# file_equal -- correct []
+
+File.open("foo", "w") {}
+
+cmd "true.rb" do
+    file_equal "foo", []
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# file_equal -- incorrect []
+
+File.open("foo", "w") {|f| f.puts "hello world" }
+
+cmd "true.rb" do
+    file_equal "foo", []
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong file 'foo'
+# ---        actual: hello world
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# file_equal -- correct [ "hello world" ]
+
+File.open("foo", "w") {|f| f.puts "hello world" }
+
+cmd "true.rb" do
+    file_equal "foo", [ "hello world" ]
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# file_equal -- incorrect [ "hello world" ]
+
+File.open("foo", "w") {}
+
+cmd "true.rb" do
+    file_equal "foo", [ "hello world" ]
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong file 'foo'
+# ---        actual: [[empty]]
+# ---        expect: hello world
+# stdout end
+
+#-----------------------------------
+# file_equal -- correct [ "hello", "world" ]
+
+File.open("foo", "w") {|f| f.puts "hello"; f.puts "world" }
+
+cmd "true.rb" do
+    file_equal "foo", [ "hello", "world" ]
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# file_equal -- incorrect [ "hello", "world" ]
+
+File.open("foo", "w") {}
+
+cmd "true.rb" do
+    file_equal "foo", [ "hello", "world" ]
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong file 'foo'
+# ---        actual: [[empty]]
+# ---        expect: hello
+# ---                world
+# stdout end
+
+#-----------------------------------
+# file_equal -- non-existing file
+
+cmd "true.rb" do
+    file_equal "foo", ""
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: no such file: 'foo'
+# stdout end
+
+#-----------------------------------
+# file_equal -- file is directory
+
+Dir.mkdir "foo"
+
+cmd "true.rb" do
+    file_equal "foo", ""
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: is a directory: 'foo'
+# stdout end
+
+#-----------------------------------
+# file_equal -- other error
+# SKIP mswin32
+
+File.symlink "foo", "foo"
+
+cmd "true.rb" do
+    file_equal "foo", ""
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: error reading file: 'foo'
+# stdout end
+
diff --git a/t/00-file_not_equal.rb b/t/00-file_not_equal.rb
new file mode 100644
index 0000000..4709d00
--- /dev/null
+++ b/t/00-file_not_equal.rb
@@ -0,0 +1,32 @@
+#======================================================================
+# test file_not_equal
+
+#-----------------------------------
+# file_not_equal -- correct ""
+
+File.open("foo", "w") {|f| f.puts "hello" }
+
+cmd "true.rb" do
+    file_not_equal "foo", ""
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# file_not_equal -- incorrect ""
+
+File.open("foo", "w") {}
+
+cmd "true.rb" do
+    file_not_equal "foo", ""
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong file 'foo'
+# ---        actual: [[empty]]
+# ---        expect: [[empty]]
+# stdout end
+
diff --git a/t/00-ignore_file.rb b/t/00-ignore_file.rb
new file mode 100644
index 0000000..5464999
--- /dev/null
+++ b/t/00-ignore_file.rb
@@ -0,0 +1,59 @@
+#======================================================================
+# test ignore_file
+
+#-----------------------------------
+# ignore_file -- actually created
+
+ignore_file "bbb"
+
+cmd "touch.rb bbb" do
+end
+
+# stdout begin
+# ### touch.rb bbb
+# stdout end
+
+#-----------------------------------
+# ignore_file -- not created
+
+ignore_file "aaa"
+
+cmd "touch.rb bbb" do
+end
+
+# stdout begin
+# ### touch.rb bbb
+# --- ERROR: created files
+# ---        actual: ["bbb"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# ignore_file -- in subdir + ok
+
+ignore_file "dir/bbb"
+Dir.mkdir "dir"
+
+cmd "touch.rb dir/bbb" do
+end
+
+# stdout begin
+# ### touch.rb dir/bbb
+# stdout end
+
+#-----------------------------------
+# ignore_file -- in subdir + error
+
+ignore_file "bbb"
+Dir.mkdir "dir"
+
+cmd "touch.rb dir/bbb" do
+end
+
+# stdout begin
+# ### touch.rb dir/bbb
+# --- ERROR: created files
+# ---        actual: ["dir/bbb"]
+# ---        expect: []
+# stdout end
+
diff --git a/t/00-import_file.rb b/t/00-import_file.rb
new file mode 100644
index 0000000..3bb702e
--- /dev/null
+++ b/t/00-import_file.rb
@@ -0,0 +1,33 @@
+#======================================================================
+# test import_file
+
+#-----------------------------------
+# import_file -- different dirs
+
+import_file "file1.txt", "qwerty1.txt"
+import_file "file2.txt", "subdir/qwerty2.txt"
+
+cmd "cat.rb qwerty1.txt subdir/qwerty2.txt > qwerty3.txt" do
+    created_files "qwerty3.txt"
+end
+
+# stdout begin
+# ### cat.rb qwerty1.txt subdir/qwerty2.txt > qwerty3.txt
+# stdout end
+
+#-----------------------------------
+# import_file -- after chdir
+
+Dir.mkdir("dir")
+Dir.chdir("dir")
+import_file "file1.txt", "qwerty1.txt"
+import_file "file2.txt", "subdir/qwerty2.txt"
+
+cmd "cat.rb qwerty1.txt subdir/qwerty2.txt > qwerty3.txt" do
+    created_files "dir/qwerty3.txt"
+end
+
+# stdout begin
+# ### cat.rb qwerty1.txt subdir/qwerty2.txt > qwerty3.txt
+# stdout end
+
diff --git a/t/00-stderr_equal.rb b/t/00-stderr_equal.rb
new file mode 100644
index 0000000..cd692bf
--- /dev/null
+++ b/t/00-stderr_equal.rb
@@ -0,0 +1,104 @@
+#======================================================================
+# test stderr_equal
+
+#-----------------------------------
+# stderr_equal -- correct ""
+
+cmd "true.rb" do
+    stderr_equal ""
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# stderr_equal -- incorrect ""
+
+cmd "echo.rb hello world >&2" do
+    stderr_equal ""
+end
+
+# stdout begin
+# ### echo.rb hello world >&2
+# --- ERROR: wrong stderr
+# ---        actual: hello world
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# stderr_equal -- correct []
+
+cmd "true.rb" do
+    stderr_equal []
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# stderr_equal -- incorrect []
+
+cmd "echo.rb hello world >&2" do
+    stderr_equal []
+end
+
+# stdout begin
+# ### echo.rb hello world >&2
+# --- ERROR: wrong stderr
+# ---        actual: hello world
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# stderr_equal -- correct [ "hello world" ]
+
+cmd "echo.rb hello world >&2" do
+    stderr_equal [ "hello world" ]
+end
+
+# stdout begin
+# ### echo.rb hello world >&2
+# stdout end
+
+#-----------------------------------
+# stderr_equal -- incorrect [ "hello world" ]
+
+cmd "true.rb" do
+    stderr_equal [ "hello world" ]
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stderr
+# ---        actual: [[empty]]
+# ---        expect: hello world
+# stdout end
+
+#-----------------------------------
+# stderr_equal -- correct [ "hello", "world" ]
+
+cmd "echo.rb hello >&2 && echo.rb world >&2" do
+    stderr_equal [ "hello", "world" ]
+end
+
+# stdout begin
+# ### echo.rb hello >&2 && echo.rb world >&2
+# stdout end
+
+#-----------------------------------
+# stderr_equal -- incorrect [ "hello", "world" ]
+
+cmd "true.rb" do
+    stderr_equal [ "hello", "world" ]
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stderr
+# ---        actual: [[empty]]
+# ---        expect: hello
+# ---                world
+# stdout end
+
diff --git a/t/00-stderr_not_equal.rb b/t/00-stderr_not_equal.rb
new file mode 100644
index 0000000..fc4fe6f
--- /dev/null
+++ b/t/00-stderr_not_equal.rb
@@ -0,0 +1,105 @@
+#======================================================================
+# test stderr_not_equal
+
+#-----------------------------------
+# stderr_not_equal -- correct ""
+
+cmd "echo.rb hello >&2" do
+    stderr_not_equal ""
+end
+
+# stdout begin
+# ### echo.rb hello >&2
+# stdout end
+
+#-----------------------------------
+# stderr_not_equal -- incorrect ""
+
+cmd "true.rb" do
+    stderr_not_equal ""
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stderr
+# ---        actual: [[empty]]
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# stderr_not_equal -- correct []
+
+cmd "echo.rb hello >&2" do
+    stderr_not_equal []
+end
+
+# stdout begin
+# ### echo.rb hello >&2
+# stdout end
+
+#-----------------------------------
+# stderr_not_equal -- incorrect []
+
+cmd "true.rb" do
+    stderr_not_equal []
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stderr
+# ---        actual: [[empty]]
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# stderr_not_equal -- correct [ "hello world" ]
+
+cmd "echo.rb not hello world >&2" do
+    stderr_not_equal [ "hello world" ]
+end
+
+# stdout begin
+# ### echo.rb not hello world >&2
+# stdout end
+
+#-----------------------------------
+# stderr_not_equal -- incorrect [ "hello world" ]
+
+cmd "echo.rb hello world >&2" do
+    stderr_not_equal [ "hello world" ]
+end
+
+# stdout begin
+# ### echo.rb hello world >&2
+# --- ERROR: wrong stderr
+# ---        actual: hello world
+# ---        expect: hello world
+# stdout end
+
+#-----------------------------------
+# stderr_not_equal -- correct [ "hello", "world" ]
+
+cmd "echo.rb hello world >&2" do
+    stderr_not_equal [ "hello", "world" ]
+end
+
+# stdout begin
+# ### echo.rb hello world >&2
+# stdout end
+
+#-----------------------------------
+# stderr_not_equal -- incorrect [ "hello", "world" ]
+
+cmd "echo.rb hello >&2 && echo.rb world >&2" do
+    stderr_not_equal [ "hello", "world" ]
+end
+
+# stdout begin
+# ### echo.rb hello >&2 && echo.rb world >&2
+# --- ERROR: wrong stderr
+# ---        actual: hello
+# ---                world
+# ---        expect: hello
+# ---                world
+# stdout end
+
diff --git a/t/00-stdout_equal.rb b/t/00-stdout_equal.rb
new file mode 100644
index 0000000..608efda
--- /dev/null
+++ b/t/00-stdout_equal.rb
@@ -0,0 +1,104 @@
+#======================================================================
+# test stdout_equal
+
+#-----------------------------------
+# stdout_equal -- correct ""
+
+cmd "true.rb" do
+    stdout_equal ""
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- incorrect ""
+
+cmd "echo.rb hello world" do
+    stdout_equal ""
+end
+
+# stdout begin
+# ### echo.rb hello world
+# --- ERROR: wrong stdout
+# ---        actual: hello world
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- correct []
+
+cmd "true.rb" do
+    stdout_equal []
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- incorrect []
+
+cmd "echo.rb hello world" do
+    stdout_equal []
+end
+
+# stdout begin
+# ### echo.rb hello world
+# --- ERROR: wrong stdout
+# ---        actual: hello world
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- correct [ "hello world" ]
+
+cmd "echo.rb hello world" do
+    stdout_equal [ "hello world" ]
+end
+
+# stdout begin
+# ### echo.rb hello world
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- incorrect [ "hello world" ]
+
+cmd "true.rb" do
+    stdout_equal [ "hello world" ]
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stdout
+# ---        actual: [[empty]]
+# ---        expect: hello world
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- correct [ "hello", "world" ]
+
+cmd "echo.rb hello && echo.rb world" do
+    stdout_equal [ "hello", "world" ]
+end
+
+# stdout begin
+# ### echo.rb hello && echo.rb world
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- incorrect [ "hello", "world" ]
+
+cmd "true.rb" do
+    stdout_equal [ "hello", "world" ]
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stdout
+# ---        actual: [[empty]]
+# ---        expect: hello
+# ---                world
+# stdout end
+
diff --git a/t/00-stdout_not_equal.rb b/t/00-stdout_not_equal.rb
new file mode 100644
index 0000000..a8ed4b4
--- /dev/null
+++ b/t/00-stdout_not_equal.rb
@@ -0,0 +1,105 @@
+#======================================================================
+# test stdout_not_equal
+
+#-----------------------------------
+# stdout_not_equal -- correct ""
+
+cmd "echo.rb hello" do
+    stdout_not_equal ""
+end
+
+# stdout begin
+# ### echo.rb hello
+# stdout end
+
+#-----------------------------------
+# stdout_not_equal -- incorrect ""
+
+cmd "true.rb" do
+    stdout_not_equal ""
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stdout
+# ---        actual: [[empty]]
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# stdout_not_equal -- correct []
+
+cmd "echo.rb hello" do
+    stdout_not_equal []
+end
+
+# stdout begin
+# ### echo.rb hello
+# stdout end
+
+#-----------------------------------
+# stdout_not_equal -- incorrect []
+
+cmd "true.rb" do
+    stdout_not_equal []
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stdout
+# ---        actual: [[empty]]
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# stdout_not_equal -- correct [ "hello world" ]
+
+cmd "echo.rb not hello world" do
+    stdout_not_equal [ "hello world" ]
+end
+
+# stdout begin
+# ### echo.rb not hello world
+# stdout end
+
+#-----------------------------------
+# stdout_not_equal -- incorrect [ "hello world" ]
+
+cmd "echo.rb hello world" do
+    stdout_not_equal [ "hello world" ]
+end
+
+# stdout begin
+# ### echo.rb hello world
+# --- ERROR: wrong stdout
+# ---        actual: hello world
+# ---        expect: hello world
+# stdout end
+
+#-----------------------------------
+# stdout_not_equal -- correct [ "hello", "world" ]
+
+cmd "echo.rb hello world" do
+    stdout_not_equal [ "hello", "world" ]
+end
+
+# stdout begin
+# ### echo.rb hello world
+# stdout end
+
+#-----------------------------------
+# stdout_not_equal -- incorrect [ "hello", "world" ]
+
+cmd "echo.rb hello && echo.rb world" do
+    stdout_not_equal [ "hello", "world" ]
+end
+
+# stdout begin
+# ### echo.rb hello && echo.rb world
+# --- ERROR: wrong stdout
+# ---        actual: hello
+# ---                world
+# ---        expect: hello
+# ---                world
+# stdout end
+
diff --git a/t/01-misc.rb b/t/01-misc.rb
new file mode 100644
index 0000000..b8a7fe1
--- /dev/null
+++ b/t/01-misc.rb
@@ -0,0 +1,643 @@
+#======================================================================
+
+#-----------------------------------
+# Ruby script called with "ruby -S"
+
+cmd "echo.rb this  is  a  line" do
+    stdout_equal "this is a line\n"
+end
+
+# stdout begin
+# ### echo.rb this  is  a  line
+# stdout end
+
+#-----------------------------------
+# actual "false.rb" will give error
+
+cmd "true.rb" do
+end
+
+cmd "false.rb" do
+end
+
+# stdout begin
+# ### true.rb
+# ### false.rb
+# --- ERROR: expected zero exit status, got 1
+# stdout end
+
+#-----------------------------------
+# actual "false.rb" will give error
+
+cmd "false.rb" do
+end
+
+# stdout begin
+# ### false.rb
+# --- ERROR: expected zero exit status, got 1
+# stdout end
+
+#-----------------------------------
+# another non-zero exit will give error
+
+cmd "exit.rb 18" do
+end
+
+# stdout begin
+# ### exit.rb 18
+# --- ERROR: expected zero exit status, got 18
+# stdout end
+
+#-----------------------------------
+# actual STDOUT will give error
+
+cmd "echo.rb a line on stdout" do
+end
+
+# stdout begin
+# ### echo.rb a line on stdout
+# --- ERROR: wrong stdout
+# ---        actual: a line on stdout
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# actual STDERR will give error
+
+cmd "echo.rb a line on stderr 1>&2" do
+end
+
+# stdout begin
+# ### echo.rb a line on stderr 1>&2
+# --- ERROR: wrong stderr
+# ---        actual: a line on stderr
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# existing files is OK
+
+File.open("before1", "w") {}
+File.open("before2", "w") {}
+cmd "true.rb" do
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# actual created file will give error
+
+cmd "echo.rb content > a-new-file" do
+end
+
+# stdout begin
+# ### echo.rb content > a-new-file
+# --- ERROR: created files
+# ---        actual: ["a-new-file"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# several actual created files will give error
+
+File.open("before1", "w") {}
+File.open("before2", "w") {}
+cmd "echo.rb x > a && echo.rb x > b" do
+end
+
+# stdout begin
+# ### echo.rb x > a && echo.rb x > b
+# --- ERROR: created files
+# ---        actual: ["a", "b"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# actual removed file will give error
+
+File.open("before", "w") {}
+cmd "rm.rb before" do
+end
+
+# stdout begin
+# ### rm.rb before
+# --- ERROR: removed files
+# ---        actual: ["before"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# several actual removed files will give error
+
+File.open("before1", "w") {}
+File.open("before2", "w") {}
+File.open("before3", "w") {}
+cmd "rm.rb before1 before2" do
+end
+
+# stdout begin
+# ### rm.rb before1 before2
+# --- ERROR: removed files
+# ---        actual: ["before1", "before2"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# actual changed files will give error
+
+# NOTE: order of writing/testing is important below
+
+File.open("changed1", "w") {}
+File.open("changed2", "w") {}
+
+File.open("script.rb", "w") do |f|
+    f.puts "t1 = File.mtime('changed2')"
+    f.puts "while File.mtime('changed2') == t1"
+    f.puts "    File.open('changed2', 'w') {|f| f.puts 111 }"
+    f.puts "    File.open('changed1', 'w') {|f| f.puts 111 }"
+    f.puts "end"
+end
+
+cmd "ruby script.rb" do
+end
+
+# stdout begin
+# ### ruby script.rb
+# --- ERROR: changed files
+# ---        actual: ["changed1", "changed2"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# mix of actual created/removed files will give error
+
+File.open("before1", "w") {}
+File.open("before2", "w") {}
+File.open("before3", "w") {}
+cmd "rm.rb before1 before2 && echo.rb x > a && echo.rb x > b" do
+end
+
+# stdout begin
+# ### rm.rb before1 before2 && echo.rb x > a && echo.rb x > b
+# --- ERROR: created files
+# ---        actual: ["a", "b"]
+# ---        expect: []
+# --- ERROR: removed files
+# ---        actual: ["before1", "before2"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# mix of "all" errros
+
+File.open("before1", "w") {}
+File.open("before2", "w") {}
+File.open("before3", "w") {}
+File.open("script.rb", "w") do |f|
+    f.puts "File.unlink 'before1'"
+    f.puts "File.unlink 'before2'"
+    f.puts "File.open('a', 'w') {}"
+    f.puts "File.open('b', 'w') {}"
+    f.puts "STDOUT.puts [11,22,33]"
+    f.puts "STDERR.puts [44,55,66]"
+    f.puts "exit 39"
+end
+cmd "ruby script.rb" do
+end
+
+# stdout begin
+# ### ruby script.rb
+# --- ERROR: expected zero exit status, got 39
+# --- ERROR: wrong stdout
+# ---        actual: 11
+# ---                22
+# ---                33
+# ---        expect: [[empty]]
+# --- ERROR: wrong stderr
+# ---        actual: 44
+# ---                55
+# ---                66
+# ---        expect: [[empty]]
+# --- ERROR: created files
+# ---        actual: ["a", "b"]
+# ---        expect: []
+# --- ERROR: removed files
+# ---        actual: ["before1", "before2"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# removed_files
+
+File.open("file1", "w") {}
+File.open("file2", "w") {}
+
+cmd "rm.rb file1" do
+    comment "removed_files"
+    removed_files "file1"
+end
+
+# stdout begin
+# ### removed_files
+# stdout end
+
+#-----------------------------------
+# FAILED removed_files
+
+File.open("file1", "w") {}
+File.open("file2", "w") {}
+
+cmd "true.rb" do
+    comment "FAILED removed_files"
+    removed_files "file1"
+end
+
+# stdout begin
+# ### FAILED removed_files
+# --- ERROR: removed files
+# ---        actual: []
+# ---        expect: ["file1"]
+# stdout end
+
+#-----------------------------------
+# changed_files
+
+File.open("file1", "w") {}
+File.open("file2", "w") {}
+
+cmd "sleep.rb 1 && touch.rb file1" do
+    comment "changed_files"
+    changed_files "file1"
+end
+
+# stdout begin
+# ### changed_files
+# stdout end
+
+#-----------------------------------
+# FAILED changed_files
+
+File.open("file1", "w") {}
+File.open("file2", "w") {}
+
+cmd "true.rb" do
+    comment "FAILED changed_files"
+    changed_files "file1"
+end
+
+# stdout begin
+# ### FAILED changed_files
+# --- ERROR: changed files
+# ---        actual: []
+# ---        expect: ["file1"]
+# stdout end
+
+#-----------------------------------
+# created_files
+
+File.open("file1", "w") {}
+File.open("file2", "w") {}
+
+cmd "touch.rb file3" do
+    comment "created_files"
+    created_files "file3"
+end
+
+# stdout begin
+# ### created_files
+# stdout end
+
+#-----------------------------------
+# FAILED created_files
+
+File.open("file1", "w") {}
+File.open("file2", "w") {}
+
+cmd "true.rb" do
+    comment "FAILED created_files"
+    created_files "file3"
+end
+
+# stdout begin
+# ### FAILED created_files
+# --- ERROR: created files
+# ---        actual: []
+# ---        expect: ["file3"]
+# stdout end
+
+#-----------------------------------
+# with comment
+
+cmd "true.rb" do
+    comment "this-is-the-comment"
+end
+
+# stdout begin
+# ### this-is-the-comment
+# stdout end
+
+#-----------------------------------
+# exit_nonzero
+
+cmd "exit.rb 33" do
+    comment "exit_nonzero"
+    exit_nonzero
+end
+
+# stdout begin
+# ### exit_nonzero
+# stdout end
+
+#-----------------------------------
+# FAILING exit_nonzero
+
+cmd "exit.rb 0" do
+    comment "failing exit_nonzero"
+    exit_nonzero
+end
+
+# stdout begin
+# ### failing exit_nonzero
+# --- ERROR: expected nonzero exit status
+# stdout end
+
+#-----------------------------------
+# exit_status
+
+cmd "exit.rb 33" do
+    comment "exit_status"
+    exit_status 33
+end
+
+# stdout begin
+# ### exit_status
+# stdout end
+
+#-----------------------------------
+# FAILING exit_status
+
+cmd "exit.rb 44" do
+    comment "failing exit_status"
+    exit_status 33
+end
+
+# stdout begin
+# ### failing exit_status
+# --- ERROR: expected 33 exit status, got 44
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- one line
+
+cmd "lines.rb 11" do
+    comment "stdout_equal"
+    stdout_equal "11\n"
+end
+
+# stdout begin
+# ### stdout_equal
+# stdout end
+
+#-----------------------------------
+# FAILING stdout_equal -- one line
+
+cmd "lines.rb 22" do
+    comment "stdout_equal"
+    stdout_equal "11\n"
+end
+
+# stdout begin
+# ### stdout_equal
+# --- ERROR: wrong stdout
+# ---        actual: 22
+# ---        expect: 11
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- two lines
+
+cmd "lines.rb 11 22" do
+    comment "stdout_equal"
+    stdout_equal "11\n22\n"
+end
+
+# stdout begin
+# ### stdout_equal
+# stdout end
+
+#-----------------------------------
+# FAILING stdout_equal -- two lines
+
+cmd "lines.rb 33 44" do
+    comment "stdout_equal"
+    stdout_equal "11\n22\n"
+end
+
+# stdout begin
+# ### stdout_equal
+# --- ERROR: wrong stdout
+# ---        actual: 33
+# ---                44
+# ---        expect: 11
+# ---                22
+# stdout end
+
+#-----------------------------------
+# stdout_equal(arr) -- two lines
+
+cmd "lines.rb 11 22" do
+    comment "stdout_equal"
+    stdout_equal ["11", "22"]
+end
+
+# stdout begin
+# ### stdout_equal
+# stdout end
+
+#-----------------------------------
+# FAILING stdout_equal(arr) -- two lines
+
+cmd "lines.rb 33 44" do
+    comment "stdout_equal"
+    stdout_equal ["11", "22"]
+end
+
+# stdout begin
+# ### stdout_equal
+# --- ERROR: wrong stdout
+# ---        actual: 33
+# ---                44
+# ---        expect: 11
+# ---                22
+# stdout end
+
+#-----------------------------------
+# FAILING stdout_equal(arr) -- different # lines
+
+cmd "lines.rb 11 22 33" do
+    comment "stdout_equal"
+    stdout_equal ["11", "22"]
+end
+
+# stdout begin
+# ### stdout_equal
+# --- ERROR: wrong stdout
+# ---        actual: 11
+# ---                22
+# ---                33
+# ---        expect: 11
+# ---                22
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- regexp argument
+
+cmd "lines.rb 11 22" do
+    comment "stdout_equal"
+    stdout_equal /^22$/
+end
+
+# stdout begin
+# ### stdout_equal
+# stdout end
+
+#-----------------------------------
+# stdout_equal -- twice, regexp argument
+
+cmd "lines.rb 11 22" do
+    comment "stdout_equal"
+    stdout_equal /^22$/
+    stdout_equal /^11$/
+end
+
+# stdout begin
+# ### stdout_equal
+# stdout end
+
+#-----------------------------------
+# FAILING first, stdout_equal -- twice, regexp argument
+
+cmd "lines.rb 99 22" do
+    comment "stdout_equal"
+    stdout_equal /^22$/
+    stdout_equal /^11$/
+end
+
+# stdout begin
+# ### stdout_equal
+# --- ERROR: wrong stdout
+# ---        actual: 99
+# ---                22
+# ---        expect: (?-mix:^11$)
+# stdout end
+
+#-----------------------------------
+# FAILING second, stdout_equal -- twice, regexp argument
+
+cmd "lines.rb 11 99" do
+    comment "stdout_equal"
+    stdout_equal /^22$/
+    stdout_equal /^11$/
+end
+
+# stdout begin
+# ### stdout_equal
+# --- ERROR: wrong stdout
+# ---        actual: 11
+# ---                99
+# ---        expect: (?-mix:^22$)
+# stdout end
+
+#-----------------------------------
+# FAILING stdout_equal -- regexp argument
+
+cmd "lines.rb 11 22" do
+    comment "stdout_equal"
+    stdout_equal /^\d+ \d+$/
+end
+
+# stdout begin
+# ### stdout_equal
+# --- ERROR: wrong stdout
+# ---        actual: 11
+# ---                22
+# ---        expect: (?-mix:^\d+ \d+$)
+# stdout end
+
+#-----------------------------------
+# stdout_equal(arr) -- regexp argument
+
+cmd "lines.rb 11 22" do
+    comment "stdout_equal"
+    stdout_equal ["11", /^22$/]
+end
+
+# stdout begin
+# ### stdout_equal
+# stdout end
+
+#-----------------------------------
+# stdout_equal(arr) -- regexp argument (II)
+
+cmd "lines.rb 11 22" do
+    comment "stdout_equal"
+    stdout_equal ["11", /^\d+$/]
+end
+
+# stdout begin
+# ### stdout_equal
+# stdout end
+
+#-----------------------------------
+# FAILING stdout_equal(arr) -- regexp argument
+
+cmd "lines.rb 11 22" do
+    comment "stdout_equal"
+    stdout_equal ["11", /^\d+ \d+$/]
+end
+
+# stdout begin
+# ### stdout_equal
+# --- ERROR: wrong stdout
+# ---        actual: 11
+# ---                22
+# ---        expect: 11
+# ---                (?-mix:^\d+ \d+$)
+# stdout end
+
+#======================================================================
+
+#-----------------------------------
+# symlinks in tree -- should work
+# TODO: this test should be improved to actually trigger the difference
+# between lstat/stat in "_update_hardlinks".
+# SKIP mswin32
+
+File.symlink "non-existing", "non-existing-link"
+
+File.open("existing", "w") {}
+File.symlink "existing", "existing-link"
+
+cmd "true.rb" do
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# file with mtime in future
+
+File.open("future-file", "w") {}
+future = Time.now + 86400
+File.utime future, future, "future-file"
+
+cmd "true.rb" do
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
diff --git a/t/01-simple.rb b/t/01-simple.rb
new file mode 100644
index 0000000..4749776
--- /dev/null
+++ b/t/01-simple.rb
@@ -0,0 +1,341 @@
+
+#-----------------------------------
+# try to run non-existing command
+
+cmd "non-existing" do
+    exit_nonzero
+    stderr_equal /non-existing: .*not found/
+end
+
+# stdout begin
+# ### non-existing
+# stdout end
+
+#-----------------------------------
+# FAILING try to run non-existing command
+
+cmd "non-existing" do
+end
+
+# stdout begin
+# ### non-existing
+# --- ERROR: expected zero exit status, got 127
+# --- ERROR: wrong stderr
+#/---        actual:.*non-existing: .*not found
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# "true.rb" is archetypic command: zero exit status, no output
+
+cmd "true.rb" do
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# true - explicit exit_zero
+
+cmd "true.rb" do
+    exit_zero
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# true - incorrect exit_nonzero
+
+cmd "true.rb" do
+    exit_nonzero
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: expected nonzero exit status
+# stdout end
+
+#-----------------------------------
+# true - incorrect exit_status
+
+cmd "true.rb" do
+    exit_status 18
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: expected 18 exit status, got 0
+# stdout end
+
+#-----------------------------------
+# true - correct exit_status
+
+cmd "true.rb" do
+    exit_status 0
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# true - incorrect stdout
+
+cmd "true.rb" do
+    stdout_equal ["hello"]
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stdout
+# ---        actual: [[empty]]
+# ---        expect: hello
+# stdout end
+
+#-----------------------------------
+# true - correct stdout
+
+cmd "true.rb" do
+    stdout_equal []
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# true - incorrect stderr
+
+cmd "true.rb" do
+    stderr_equal ["hello"]
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: wrong stderr
+# ---        actual: [[empty]]
+# ---        expect: hello
+# stdout end
+
+#-----------------------------------
+# true - correct stderr
+
+cmd "true.rb" do
+    stderr_equal []
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# true - incorrect created_files
+
+cmd "true.rb" do
+    created_files "foo"
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: created files
+# ---        actual: []
+# ---        expect: ["foo"]
+# stdout end
+
+#-----------------------------------
+# true - incorrect created_files
+
+cmd "true.rb" do
+    created_files "foo", "bar"
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: created files
+# ---        actual: []
+# ---        expect: ["bar", "foo"]
+# stdout end
+
+#-----------------------------------
+# true - correct created_files
+
+cmd "true.rb" do
+    created_files
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# true - incorrect changed_files
+
+cmd "true.rb" do
+    changed_files "foo"
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: changed files
+# ---        actual: []
+# ---        expect: ["foo"]
+# stdout end
+
+#-----------------------------------
+# true - incorrect changed_files
+
+cmd "true.rb" do
+    changed_files "foo", "bar"
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: changed files
+# ---        actual: []
+# ---        expect: ["bar", "foo"]
+# stdout end
+
+#-----------------------------------
+# true - correct changed_files
+
+cmd "true.rb" do
+    changed_files
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# true - incorrect removed_files
+
+cmd "true.rb" do
+    removed_files "foo"
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: removed files
+# ---        actual: []
+# ---        expect: ["foo"]
+# stdout end
+
+#-----------------------------------
+# true - incorrect removed_files
+
+cmd "true.rb" do
+    removed_files "foo", "bar"
+end
+
+# stdout begin
+# ### true.rb
+# --- ERROR: removed files
+# ---        actual: []
+# ---        expect: ["bar", "foo"]
+# stdout end
+
+#-----------------------------------
+# true - correct removed_files
+
+cmd "true.rb" do
+    removed_files
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#======================================================================
+# test - without assertions
+
+#-----------------------------------
+# without assertions -- correct
+
+cmd "true.rb" do
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# without assertions -- incorrect exit status
+
+cmd "false.rb" do
+end
+
+# stdout begin
+# ### false.rb
+# --- ERROR: expected zero exit status, got 1
+# stdout end
+
+#-----------------------------------
+# without assertions -- incorrect stdout
+
+cmd "echo.rb hello" do
+end
+
+# stdout begin
+# ### echo.rb hello
+# --- ERROR: wrong stdout
+# ---        actual: hello
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# without assertions -- incorrect stderr
+
+cmd "echo.rb hello >&2" do
+end
+
+# stdout begin
+# ### echo.rb hello >&2
+# --- ERROR: wrong stderr
+# ---        actual: hello
+# ---        expect: [[empty]]
+# stdout end
+
+#-----------------------------------
+# without assertions -- incorrect created_files
+
+cmd "touch.rb new_file" do
+end
+
+# stdout begin
+# ### touch.rb new_file
+# --- ERROR: created files
+# ---        actual: ["new_file"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# without assertions -- incorrect changed_files
+
+touch_file "changed_file"
+cmd "echo.rb ... >> changed_file" do
+end
+
+# stdout begin
+# ### echo.rb ... >> changed_file
+# --- ERROR: changed files
+# ---        actual: ["changed_file"]
+# ---        expect: []
+# stdout end
+
+#-----------------------------------
+# without assertions -- incorrect removed_files
+
+touch_file "removed_file"
+cmd "rm.rb removed_file" do
+end
+
+# stdout begin
+# ### rm.rb removed_file
+# --- ERROR: removed files
+# ---        actual: ["removed_file"]
+# ---        expect: []
+# stdout end
+