@Test
public void testGetLogContentWhenFileDoesNotExistShouldReturnFileNotFoundMessage() {

    //GIVEN
    Collection<File> files = getFileCollection();
    String fileName = "non-existent-file";
    given(fileUtils.getFilesWithExtension(LOG_PATH, LOG_EXTENSION)).willReturn(files);
    //WHEN
    String result = underTest.getLogContent(fileName);
    //THEN
    assertEquals(FILE_NOT_FOUND_MESSAGE, result);
}