我想使用以下测试代码对 java.nio.file.Files 中的公共(public)静态函数 readAllBytes 进行 stub 。
@PrepareForTest(Files.class)
public void testGetNotExistingRestFile() throws Exception {
PowerMockito.mockStatic(Files.class);
PowerMockito.doThrow(mock(IOException.class)).when(Files.readAllBytes(any(Path.class)));
}
每次抛出 NullPointerException 时,我都能弄清楚我做错了什么。
java.lang.NullPointerException
at java.nio.file.Files.provider(Files.java:67)
at java.nio.file.Files.newByteChannel(Files.java:317)
at java.nio.file.Files.newByteChannel(Files.java:363)
at java.nio.file.Files.readAllBytes(Files.java:2981)
at nl.mooij.bob.RestFileProviderTest.testGetNotExistingRestFile(RestFileProviderTest.java:53)
如何使用 PowerMockito stub java.nio.file.Files 中的 readAllBytes 函数?
最佳答案
调用 Mockito,而不是 PowerMockito 并反转 stub 顺序:
@Test(expected=IOException.class)
@PrepareForTest(Files.class)
public void testGetNotExistingRestFile() throws Exception {
// arrange
PowerMockito.mockStatic(Files.class);
Mockito.when(Files.readAllBytes(Matchers.any(Path.class))).thenThrow(Mockito.mock(IOException.class));
// act
Files.readAllBytes(Mockito.mock(Path.class));
}
另一种可能是:
@Test(expected=IOException.class)
@PrepareForTest(Files.class)
public void testGetNotExistingRestFile() throws Exception {
// arrange
PowerMockito.mockStatic(Files.class);
Files filesMock = PowerMockito.mock(Files.class);
Mockito.when(filesMock.readAllBytes(Matchers.any(Path.class))).thenThrow(Mockito.mock(IOException.class));
// act
filesMock.readAllBytes(Mockito.mock(Path.class));
}
关于java - stub 时 PowerMockito NullPointerException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29583236/