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@@ -55,7 +55,8 @@
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     end
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     def validate!
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-      raise NotWorkingCopy unless self.exist? && self.pistonized?
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+      raise NotWorkingCopy unless self.pistonized?
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+      self
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     end
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     # Creates the initial working copy for pistonizing a new repository.

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@@ -1 +1,69 @@
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+require File.dirname(__FILE__) + "/../../test_helper"
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+
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+class TestWorkingCopyValidate < Test::Unit::TestCase
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+  def setup
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+    @wcdir = Pathname.new("tmp/wc")
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+    @wcdir.rmtree rescue nil
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+    @wcdir.mkpath
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+    @wc = Piston::WorkingCopy.new(@wcdir)
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+  end
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+
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+  def teardown
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+    @wcdir.rmtree rescue nil
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+  end
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+
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+  def test_exists_when_the_directory_exists
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+    assert @wc.exist?, "WorkingCopy should have existed, since the directory exists"
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+  end
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+
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+  def test_does_not_exist_when_directory_not_present
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+    @wcdir.rmtree
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+    deny @wc.exist?, "WorkingCopy should NOT have existed, since the directory does not exist"
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+  end
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+
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+  def test_does_not_exist_when_directory_is_a_file
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+    @wcdir.rmtree
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+    touch(@wcdir)
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+    deny @wc.exist?, "WorkingCopy should NOT have existed, since the directory is a file"
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+  end
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+  
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+  def test_is_pistonized_if_exist_and_has_piston_dot_yaml_file
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+    @wc.stubs(:exist?).returns(true)
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+    touch(@wcdir + ".piston.yml")
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+    assert @wc.pistonized?, "WorkingCopy should be Pistonized, since the .piston.yml file exists"
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+  end
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+
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+  def test_is_NOT_pistonized_if_no_piston_dot_yaml_file
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+    @wc.stubs(:exist?).returns(true)
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+    deny @wc.pistonized?, "WorkingCopy should not be Pistonized, since the .piston.yml does not file exists"
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+  end
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+
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+  def test_is_NOT_pistonized_if_exist_returns_false
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+    @wc.stubs(:exist?).returns(false)
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+    deny @wc.pistonized?, "WorkingCopy should not be Pistonized, since #exist? returned false"
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+  end
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+
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+  def test_is_NOT_pistonized_if_piston_dot_yaml_is_a_directory
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+    @wc.stubs(:exist?).returns(true)
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+    (@wcdir + ".piston.yml").mkdir
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+    deny @wc.pistonized?, "WorkingCopy should not be Pistonized, since .piston.yml is a directory"
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+  end
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+
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+  def test_validate_bang_returns_self_when_ok
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+    @wc.stubs(:pistonized?).returns(true)
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+    assert_equal @wc, @wc.validate!
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+  end
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+
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+  def test_validate_bang_raises_not_working_copy_when_not_pistonized
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+    @wc.stubs(:pistonized?).returns(false)
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+    assert_raise(Piston::WorkingCopy::NotWorkingCopy) do
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+      @wc.validate!
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+    end
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+  end
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+
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+  protected
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+  def touch(path)
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+    File.open(path, "wb") {|f| f.write ""}
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+  end
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+end