1 files changed, 52 insertions, 0 deletions
diff --git a/spec/mspec/spec/matchers/complain_spec.rb b/spec/mspec/spec/matchers/complain_spec.rb
new file mode 100644
index 0000000000..709b57be6c
--- /dev/null
+++ b/spec/mspec/spec/matchers/complain_spec.rb
@@ -0,0 +1,52 @@
+require 'spec_helper'
+require 'mspec/expectations/expectations'
+require 'mspec/matchers'
+
+describe ComplainMatcher do
+  it "matches when executing the proc results in output to $stderr" do
+    proc = lambda { warn "I'm gonna tell yo mama" }
+    ComplainMatcher.new(nil).matches?(proc).should == true
+  end
+
+  it "maches when executing the proc results in the expected output to $stderr" do
+    proc = lambda { warn "Que haces?" }
+    ComplainMatcher.new("Que haces?\n").matches?(proc).should == true
+    ComplainMatcher.new("Que pasa?\n").matches?(proc).should == false
+    ComplainMatcher.new(/Que/).matches?(proc).should == true
+    ComplainMatcher.new(/Quoi/).matches?(proc).should == false
+  end
+
+  it "does not match when there is no output to $stderr" do
+    ComplainMatcher.new(nil).matches?(lambda {}).should == false
+  end
+
+  it "provides a useful failure message" do
+    matcher = ComplainMatcher.new(nil)
+    matcher.matches?(lambda { })
+    matcher.failure_message.should == ["Expected a warning", "but received none"]
+    matcher = ComplainMatcher.new("listen here")
+    matcher.matches?(lambda { warn "look out" })
+    matcher.failure_message.should ==
+      ["Expected warning: \"listen here\"", "but got: \"look out\""]
+    matcher = ComplainMatcher.new(/talk/)
+    matcher.matches?(lambda { warn "listen up" })
+    matcher.failure_message.should ==
+      ["Expected warning to match: /talk/", "but got: \"listen up\""]
+  end
+
+  it "provides a useful negative failure message" do
+    proc = lambda { warn "ouch" }
+    matcher = ComplainMatcher.new(nil)
+    matcher.matches?(proc)
+    matcher.negative_failure_message.should ==
+      ["Unexpected warning: ", "\"ouch\""]
+    matcher = ComplainMatcher.new("ouchy")
+    matcher.matches?(proc)
+    matcher.negative_failure_message.should ==
+      ["Expected warning: \"ouchy\"", "but got: \"ouch\""]
+    matcher = ComplainMatcher.new(/ou/)
+    matcher.matches?(proc)
+    matcher.negative_failure_message.should ==
+      ["Expected warning not to match: /ou/", "but got: \"ouch\""]
+  end
+end