public String getValue(String source, String defaultValue) {
        return properties.getProperty(source, defaultValue);
    }
@Test
    void testGetValue() {
        properties.setProperty("test.key", "test.value");
        assertEquals("test.value", loggingProperties.getValue("test.key", "default.value"));
        properties.clear();
        assertEquals("default.value", loggingProperties.getValue("test.key", "default.value"));
    }