1 files changed, 75 insertions, 0 deletions
diff --git a/test/rake/test_invocation_chain.rb b/test/rake/test_invocation_chain.rb
new file mode 100644
index 0000000000..a5843bfd2a
--- /dev/null
+++ b/test/rake/test_invocation_chain.rb
@@ -0,0 +1,75 @@
+require 'test/unit'
+require 'rake'
+
+######################################################################
+class TestAnEmptyInvocationChain < Test::Unit::TestCase
+
+  def setup
+    @empty = Rake::InvocationChain::EMPTY
+  end
+
+  def test_should_be_able_to_add_members
+    assert_nothing_raised do
+      @empty.append("A")
+    end
+  end
+
+  def test_to_s
+    assert_equal "TOP", @empty.to_s
+  end
+end
+
+######################################################################
+class TestAnInvocationChainWithOneMember < Test::Unit::TestCase
+
+  def setup
+    @empty = Rake::InvocationChain::EMPTY
+    @first_member = "A"
+    @chain = @empty.append(@first_member)
+  end
+
+  def test_should_report_first_member_as_a_member
+    assert @chain.member?(@first_member)
+  end
+
+  def test_should_fail_when_adding_original_member
+    ex = assert_raise RuntimeError do
+      @chain.append(@first_member)
+    end
+    assert_match(/circular +dependency/i, ex.message)
+    assert_match(/A.*=>.*A/, ex.message)
+  end
+
+  def test_to_s
+    assert_equal "TOP => A", @chain.to_s
+  end
+
+end
+
+######################################################################
+class TestAnInvocationChainWithMultipleMember < Test::Unit::TestCase
+
+  def setup
+    @first_member = "A"
+    @second_member = "B"
+    ch = Rake::InvocationChain::EMPTY.append(@first_member)
+    @chain = ch.append(@second_member)
+  end
+
+  def test_should_report_first_member_as_a_member
+    assert @chain.member?(@first_member)
+  end
+
+  def test_should_report_second_member_as_a_member
+    assert @chain.member?(@second_member)
+  end
+
+  def test_should_fail_when_adding_original_member
+    ex = assert_raise RuntimeError do
+      @chain.append(@first_member)
+    end
+    assert_match(/A.*=>.*B.*=>.*A/, ex.message)
+  end
+end
+
+