Refactor tests for read_tree, write_tree, and commit_tree (#679)

Signed-off-by: James Couball <jcouball@yahoo.com>

git.gemspec

@@ -32,6 +32,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'bump', '~> 0.10'
   s.add_development_dependency 'create_github_release', '~> 0.2'
   s.add_development_dependency 'minitar', '~> 0.9'
+  s.add_development_dependency 'mocha', '~> 2.1'
   s.add_development_dependency 'rake', '~> 13.0'
   s.add_development_dependency 'test-unit', '~> 3.3'
 

lib/git/lib.rb

@@ -1043,7 +1043,7 @@ def commit_tree(tree, opts = {})
       arr_opts = []
       arr_opts << tree
       arr_opts << '-p' << opts[:parent] if opts[:parent]
-      arr_opts += [opts[:parents]].map { |p| ['-p', p] }.flatten if opts[:parents]
+      arr_opts += Array(opts[:parents]).map { |p| ['-p', p] }.flatten if opts[:parents]
       command('commit-tree', *arr_opts, redirect: "< #{escape t.path}")
     end
 
@@ -1113,7 +1113,7 @@ def current_command_version
     # @example
     #   lib.current_command_version #=> [2, 42, 0]
     #
-    #   lib.compare_version_to(2, 41, 0) #=> 1 
+    #   lib.compare_version_to(2, 41, 0) #=> 1
     #   lib.compare_version_to(2, 42, 0) #=> 0
     #   lib.compare_version_to(2, 43, 0) #=> -1
     #

tests/test_helper.rb

@@ -2,6 +2,7 @@
 require 'fileutils'
 require 'minitar'
 require 'test/unit'
+require 'mocha/test_unit'
 require 'tmpdir'
 
 require "git"
@@ -148,6 +149,7 @@ def with_custom_env_variables(&block)
   # @param expected_command_line [Array<String>] The expected arguments to be sent to Git::Lib#command
   # @param git_cmd [Symbol] the method to be called on the Git::Base object
   # @param git_cmd_args [Array<Object>] The arguments to be sent to the git_cmd method
+  # @param git_output [String] The output to be returned by the Git::Lib#command method
   #
   # @yield [git] An initialization block
   #   The initialization block is called after a test project is created with Git.init.
@@ -157,9 +159,11 @@ def with_custom_env_variables(&block)
   #
   # @return [void]
   #
-  def assert_command_line(expected_command_line, git_cmd, git_cmd_args)
+  def assert_command_line(expected_command_line, git_cmd, git_cmd_args, git_output = nil)
     actual_command_line = nil
 
+    command_output = ''
+
     in_temp_dir do |path|
       git = Git.init('test_project')
 
@@ -169,17 +173,26 @@ def assert_command_line(expected_command_line, git_cmd, git_cmd_args)
         # Mock the Git::Lib#command method to capture the actual command line args
         git.lib.define_singleton_method(:command) do |cmd, *opts, &block|
           actual_command_line = [cmd, *opts.flatten]
+          git_output
         end
 
-        git.send(git_cmd, *git_cmd_args)
+        command_output = git.send(git_cmd, *git_cmd_args)
       end
     end
 
     assert_equal(expected_command_line, actual_command_line)
+
+    command_output
   end
 
   def assert_child_process_success(&block)
     yield
     assert_equal 0, $CHILD_STATUS.exitstatus, "Child process failed with exitstatus #{$CHILD_STATUS.exitstatus}"
   end
+
+  def windows_platform?
+    # Check if on Windows via RUBY_PLATFORM (CRuby) and RUBY_DESCRIPTION (JRuby)
+    win_platform_regex = /mingw|mswin/
+    RUBY_PLATFORM =~ win_platform_regex || RUBY_DESCRIPTION =~ win_platform_regex
+  end
 end