PowerMockでPrivateメソッドをモック化したい

どなたか、解決策をご教示いただけますでしょうか。

Javaにて、JUnit＋PowerMockでテストを行っております。

privateメソッド（下ソース：SampleTarget.setDto）をMock化しようとしたところ、
SamplePropTest#test001 メソッドの
.　PowerMockito.when(mockInstance, MemberMatcher.method(SampleTarget.class, "setDto", ant(), any()))
.withNoArguments().thenReturn(mockDto);
の場所で、以下のエラーが発生してしまいました。

エラーの内容見た限り引数のany()に原因があるようですが、any()以外に当てはまる引数の書き方があるでしょうか？

お手数をおかけいたしますが、よろしくお願いいたします。

発生している問題・エラーメッセージ

java
1org.mockito.exceptions.misusing.InvalidUseOfMatchersException:
2Misplaced or misused argument matcher detected here:
3
4-> at
5com.sample.sampletest(sampleTest.java:10)
6-> at
7com.sample.sampletest(sampleTest.java:10)
8
9You cannot use argument matchers outside of verification or stubbing.
10Examples of correct usage of argument matchers:
11     when(mock.get(anyInt())).thenReturn(null);
12     doThrow(new RuntimeException()).when(mock).someVoidMethod(anyObject());
13     verify(mock).someMethod(contains("foo"))
14
15This message may appear after an NullPointerException if the last
16matcher is returning an object
17like any() but the stubbed method signature expect a primitive argument,
18in this case,
19use primitive alternatives.
20     when(mock.get(any())); // bad use, will raise NPE
21     when(mock.get(anyInt())); // correct usage use
22
23Also, this error might show up because you use argument matchers with
24methods that cannot be mocked.
25Following methods *cannot* be stubbed/verified:
26final/private/equals()/hashCode().
27Mocking methods declared on non-public parent classes is not supported.
28
29     at
30org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.resetMocks(ResetMocksTestExecutionListener.java:82)
31     at
32org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.resetMocks(ResetMocksTestExecutionListener.java:69)
33     at
34org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.afterTestMethod(ResetMocksTestExecutionListener.java:63)
35     at
36org.springframework.test.context.TestContextManager.afterTestMethod(TestContextManager.java:441)
37     at
38org.springframework.test.context.junit.jupiter.SpringExtension.afterEach(SpringExtension.java:140)
39     at
40org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAfterEachCallbacks$11(TestMethodTestDescriptor.java:255)
41     at
42org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$12(TestMethodTestDescriptor.java:271)
43     at
44org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
45     at
46org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$13(TestMethodTestDescriptor.java:271)
47     at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
48     at
49org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAllAfterMethodsOrCallbacks(TestMethodTestDescriptor.java:270)
50     at
51org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAfterEachCallbacks(TestMethodTestDescriptor.java:254)
52     at
53org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:143)
54     at
55org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:71)
56     at
57org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
58     at
59org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
60     at
61org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
62     at
63org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
64     at
65org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
66     at
67org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
68     at
69org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
70     at
71org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
72     at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
73     at
74org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
75     at
76org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
77     at
78org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
79     at
80org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
81     at
82org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
83     at
84org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
85     at
86org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
87     at
88org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
89     at
90org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
91     at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
92     at
93org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
94     at
95org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
96     at
97org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
98     at
99org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
100     at
101org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
102     at
103org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
104     at
105org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
106     at
107org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
108     at
109org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
110     at
111org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
112     at
113org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
114     at
115org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
116     at
117org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248)
118     at
119org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211)
120     at
121org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226)
122     at
123org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199)
124     at
125org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:141)
126     at
127org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:98)
128     at
129org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
130     at
131org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:542)
132     at
133org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770)
134     at
135org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)
136     at
137org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)
138Destroy method on bean with name 'restapiLifeCycle' threw an exception:
139java.lang.NullPointerException

該当のソースコード

java
1package sample;
2
3import Sample1;
4import Smaple2;
5
6/**
7 * テスト対象クラス.
8 */
9public class SampleTarget {
10
11    private Dto setDto(Sample1 sample1, Smaple2 sample2)
12    throws Exception {
13        Dto dto = new Dto();
14
15        dto.setAAA(sample1.AAA);
16        dto.setBBB(sample2.BBB);
17
18        return dto;
19    }
20}

java
1@RunWith(PowerMockRunner.class)
2@PrepareForTest({SampleTarget.class})
3public class SamplePropTest extends TestCase{
4
5    @Test
6    public void test001() throws Exception{
7
8    Dto mockDto = new Dto();
9    mockDto.setAAA(aaa);
10    mockDto.setBBB(bbb)
11
12    SampleTarget mockInstance = PowerMockito.mock(SampleTarget.class);
13    PowerMockito.when(mockInstance, MemberMatcher.method(SampleTarget.class, "setDto", ant(), any()))
14                .withNoArguments().thenReturn(mockDto);
15
16    // privateメソッドにアクセスするためにリフレクションを使う
17    Method method = SampleTarget.class.getDeclaredMethod("setDto");
18    method.setAccessible(true);
19
20    }

補足情報

・JDK：11.0.2
・JUnit：4.12
・Eclipse：4.16
・org.mockito:mockito-core:2.+
・org.powermock:powermock-module-junit4:2.0.0-RC.4
・org.powermock:powermock-api-mockito2:2.0.0-RC.4

行動規範の内容に同意します

回答1件

ベストアンサー

MemberMatcher.method の引数にはリフレクションするメソッドと一致する class 変数、
matcher を渡したいのであれば withArguments の方に渡す必要があります。
withArguments に渡す時も any(SampleC1.class) のように引数の型をany に渡す必要があるので注意してください

        SampleTarget mockInstance = PowerMockito.mock(SampleTarget.class);
        PowerMockito.when(mockInstance, MemberMatcher.method(SampleTarget.class, "setDto", Sample1.class, Sample2.class)) // setDto(Sample1, Sample2) の形式のため
                .withArguments(any(Sample1.class), any(Sample2.class)) // 引数ですべての引数に当てはめたい場合
                .thenReturn(mockDto);

        // privateメソッドにアクセスするためにリフレクションを使う
        Method method = SampleTarget.class.getDeclaredMethod("setDto", Sample1.class, Sample2.class);
        method.setAccessible(true);

投稿2021/02/13 06:07

maigo_name

総合スコア557

kachikata96

2021/02/14 04:05

回答ありがとうございます。上記の書き方で試したところ同じエラーとなりました。しかし、引数がある場合withNoArgumentsではなくwithArgumentsにしてそちらにも引数を設定する必要があったり、getDeclaredMethodのほうにも引数が必要であるという情報は見つけられなかったのでとても参考になりました。

maigo_name

2021/02/14 04:17

確認ありがとうございます。解決に至らず残念です。同じエラーとありますが、全く同じでしたでしょうか。手元で実装して確認したのですが、私の環境では正常に動作するのを確認したのでどこに違いがあったか気になっています。エラー文の上位（PowerMockやMockitoが出している、何が悪いかの原因）や、出している例外部分だけでも抜粋して見せていただくことは可能でしょうか

kachikata96

2021/02/14 04:53

さらなる対応ありがとうございます。見辛かったら申し訳ありませんが下記にエラー文を載せさせていただきます。 org.mockito.exceptions.misusing.InvalidUseOfMatchersException: Misplaced or misused argument matcher detected here: -> at com.sample.sampletest(sampleTest.java:10) -> at com.sample.sampletest(sampleTest.java:10) You cannot use argument matchers outside of verification or stubbing. Examples of correct usage of argument matchers: when(mock.get(anyInt())).thenReturn(null); doThrow(new RuntimeException()).when(mock).someVoidMethod(anyObject()); verify(mock).someMethod(contains("foo")) This message may appear after an NullPointerException if the last matcher is returning an object like any() but the stubbed method signature expect a primitive argument, in this case, use primitive alternatives. when(mock.get(any())); // bad use, will raise NPE when(mock.get(anyInt())); // correct usage use Also, this error might show up because you use argument matchers with methods that cannot be mocked. Following methods *cannot* be stubbed/verified: final/private/equals()/hashCode(). Mocking methods declared on non-public parent classes is not supported. at org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.resetMocks(ResetMocksTestExecutionListener.java:82) at org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.resetMocks(ResetMocksTestExecutionListener.java:69) at org.springframework.boot.test.mock.mockito.ResetMocksTestExecutionListener.afterTestMethod(ResetMocksTestExecutionListener.java:63) at org.springframework.test.context.TestContextManager.afterTestMethod(TestContextManager.java:441) at org.springframework.test.context.junit.jupiter.SpringExtension.afterEach(SpringExtension.java:140) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAfterEachCallbacks$11(TestMethodTestDescriptor.java:255) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$12(TestMethodTestDescriptor.java:271) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$13(TestMethodTestDescriptor.java:271) at java.base/java.util.ArrayList.forEach(ArrayList.java:1540) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAllAfterMethodsOrCallbacks(TestMethodTestDescriptor.java:270) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAfterEachCallbacks(TestMethodTestDescriptor.java:254) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:143) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:71) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at java.base/java.util.ArrayList.forEach(ArrayList.java:1540) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at java.base/java.util.ArrayList.forEach(ArrayList.java:1540) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248) at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211) at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:141) at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:98) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:542) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210) Destroy method on bean with name 'restapiLifeCycle' threw an exception: java.lang.NullPointerException