support for tagging and filtering

README.md

@@ -73,8 +73,10 @@ Thanks to D's User Defined Attributes, test names no longer have to start with
 "test".
 
 Put `mixin UnitTest;` in your test class and attach `@Test`,
-`@BeforeEach`, `@AfterEach`, `@BeforeAll`, `@AfterAll`, and `@Disabled("...")`
-(borrowed from JUnit 5) to the member functions to state their purpose.
+`@BeforeEach`, `@AfterEach`, `@BeforeAll`, `@AfterAll`, `@Tag("...")`,
+and `@Disabled("...")`
+(borrowed from [JUnit 5](http://junit.org/junit5/docs/current/user-guide/))
+to the member functions to state their purpose.
 
 Test Results
 ------------

example.d

@@ -143,7 +143,10 @@ class TestingThisAndThat
     }
 
     // test function can even be private
+    // tagged test functions can be selected to be included or excluded
     @Test
+    @Tag("fast")
+    @Tag("smoke")
     private void success()
     {
         testResult(true);
@@ -207,6 +210,7 @@ class TestingAsynchronousCode
     }
 
     @Test
+    @Tag("slow")
     public void test()
     {
         assertFalse(done);

src/dunit/attributes.d

@@ -11,6 +11,11 @@ struct Disabled
     string reason;
 }
 
+struct Tag
+{
+    string name;
+}
+
 deprecated("use AfterEach instead") alias After = AfterEach;
 deprecated("use AfterAll instead") alias AfterClass = AfterAll;
 deprecated("use BeforeEach instead") alias Before = BeforeEach;