1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package vogar.target.junit;
18
19import java.lang.annotation.Annotation;
20import java.lang.reflect.Method;
21import java.lang.reflect.Modifier;
22import org.junit.runner.RunWith;
23import org.junit.runners.Parameterized;
24import org.junit.runners.Suite;
25
26/**
27 * Utilities for manipulating JUnit4 tests.
28 */
29public final class Junit4 {
30    private Junit4() {}
31
32    public static boolean isJunit4Test(Class<?> klass) {
33        boolean isTestSuite = false;
34        boolean hasSuiteClasses = false;
35
36        boolean concrete = !Modifier.isAbstract(klass.getModifiers());
37
38        // @RunWith(Suite.class)
39        // @SuiteClasses( ... )
40        // public class MyTest { ... }
41        //   or
42        // @RunWith(Parameterized.class)
43        // public class MyTest { ... }
44        for (Annotation a : klass.getAnnotations()) {
45            Class<?> annotationClass = a.annotationType();
46
47            if (RunWith.class.isAssignableFrom(annotationClass)) {
48                Class<?> runnerClass = ((RunWith) a).value();
49                if (Suite.class.isAssignableFrom(runnerClass)) {
50                    isTestSuite = true;
51                } else if (Parameterized.class.isAssignableFrom(runnerClass)) {
52                    // @Parameterized test classes are instantiated so must be concrete.
53                    return concrete;
54                }
55            } else if (Suite.SuiteClasses.class.isAssignableFrom(annotationClass)) {
56                hasSuiteClasses = true;
57            }
58
59            if (isTestSuite && hasSuiteClasses) {
60                // This doesn't instantiate the class so doesn't care if it's abstract.
61                return true;
62            }
63        }
64
65        // Test classes that have methods annotated with @Test are instantiated so must be concrete.
66        if (!concrete) {
67            return false;
68        }
69
70        // public class MyTest {
71        //     @Test
72        //     public void example() { ... }
73        // }
74        for (Method m : klass.getMethods()) {
75            for (Annotation a : m.getAnnotations()) {
76                if (org.junit.Test.class.isAssignableFrom(a.annotationType())) {
77                    return true;
78                }
79            }
80        }
81
82        return false;
83    }
84}
85