Add integration tests for profiler

.gitignore

@@ -11,6 +11,7 @@
 /Library/Homebrew/.npmignore
 /Library/Homebrew/bin
 /Library/Homebrew/doc
+/Library/Homebrew/prof
 /Library/Homebrew/test/.gem
 /Library/Homebrew/test/.subversion
 /Library/Homebrew/test/coverage

Library/Homebrew/test/dev-cmd/prof_spec.rb

@@ -5,4 +5,24 @@ require "cmd/shared_examples/args_parse"
 
 describe "brew prof" do
   it_behaves_like "parseable arguments"
+
+  describe "integration tests", :integration_test do
+    after do
+      FileUtils.rm_rf HOMEBREW_LIBRARY_PATH/"prof"
+    end
+
+    it "works using ruby-prof (the default)" do
+      expect { brew "prof", "help", "HOMEBREW_BROWSER" => "echo" }
+        .to output(/^Example usage:/).to_stdout
+        .and not_to_output.to_stderr
+        .and be_a_success
+    end
+
+    it "works using stackprof" do
+      expect { brew "prof", "--stackprof", "help", "HOMEBREW_BROWSER" => "echo" }
+        .to output(/^Example usage:/).to_stdout
+        .and not_to_output.to_stderr
+        .and be_a_success
+    end
+  end
 end