@Test
@PrepareForTest({Configuration.class})

public void testLoadDefaultSettings() throws Exception {
    InputStream mockInStream = mock(InputStream.class);
    Configuration mockConfig = mock(Configuration.class);
    when(mockAssets.open(anyString())).thenReturn(mockInStream);
    when(mockContext.getAssets()).thenReturn(mockAssets);
    mockStatic(Configuration.class);
    doReturn(mockConfig).when(Configuration.class, "read", any(Reader.class));
    assertSame(mockConfig, FileHelper.loadDefaultSettings(mockContext));
    Mockito.verify(mockAssets.open(anyString()));
}