mockito3 mockConstruction能在“新文件”上生成存根吗

Question

我看到Mockito也支持模拟施工：

https://javadoc.io/static/org.mockito/mockito-core/3.11.2/org/mockito/Mockito.html#49https://rieckpil.de/mock-java-constructors-and-their-object-creation-with-mockito/

但是我不能在文件的构造上做存根:

try (MockedConstruction<File> ignored = Mockito.mockConstruction(File.class,
      (context) -> {
          Log.info("new file: {} in {},{},{}", context.getCount(), context.arguments(), context.constructor());
          return Mockito.withSettings().defaultAnswer(CALLS_REAL_METHODS);
       })) {
       File stub = new File("test");
}

它将为java.lang.StackOverflowError

at java.base/java.io.File.exists(File.java:816)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at java.base/java.io.File.exists(File.java:816)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at java.base/java.io.File.exists(File.java:816)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:642)

你知道如何模拟“新”文件类吗？

谢谢。

Answer 1

通过在测试中添加以下代码，我成功地运行了该程序：

 static class Foo implements Serializable, Comparable<Foo> {
    String method() {
        return "foo";
    }

    public int compareTo(Foo o) {
        return 0;
    }
}

@Test
void testFile() {
    try (MockedConstruction mocked = mockConstruction(Foo.class)) {
        Foo foo = new Foo();
        when(foo.method()).thenReturn("bar");
        assertEquals("bar", foo.method());
        verify(foo).method();
    }
    
    try (MockedConstruction<File> ignored = Mockito.mockConstruction(File.class,
            (context) -> {
                Log.info("new file: {} in {},{},{}", context.getCount(), context.arguments(), context.constructor());
                return Mockito.withSettings().defaultAnswer(CALLS_REAL_METHODS);
            })) {
        File stub = new File("test");
    }
}

恕我直言，莫基托/字节芽中的一个错误