Convert brew uninstall test to spec.

Library/Homebrew/test/cmd/uninstall_spec.rb

@@ -0,0 +1,12 @@
+describe "brew uninstall", :integration_test do
+  it "uninstalls a given Formula" do
+    shutup do
+      expect { brew "install", testball }.to be_a_success
+    end
+
+    expect { brew "uninstall", "--force", testball }
+      .to output(/Uninstalling testball/).to_stdout
+      .and not_to_output.to_stderr
+      .and be_a_success
+  end
+end

Library/Homebrew/test/uninstall_test.rb

@@ -60,10 +60,3 @@ class UninstallTests < Homebrew::TestCase
     end
   end
 end
-
-class IntegrationCommandTestUninstall < IntegrationCommandTestCase
-  def test_uninstall
-    cmd("install", testball)
-    assert_match "Uninstalling testball", cmd("uninstall", "--force", testball)
-  end
-end