Use MockEnvironment.withProperty in test

Replace MockEnvironment.setProperty(...) with withProperty(...) in SpringApplicationUtilsTest#testGetLoggingLevel to use the fluent API and correctly set the logging level property for the test.

Author: mercyblitz

microsphere-spring-boot-core/src/test/java/io/microsphere/spring/boot/util/SpringApplicationUtilsTest.java

@@ -112,7 +112,7 @@ void testLog() {
 
     void testGetLoggingLevel(String level) {
         MockEnvironment environment = new MockEnvironment();
-        environment.setProperty(MICROSPHERE_SPRING_BOOT_LOGGING_LEVEL_PROPERTY_NAME, level);
+        environment.withProperty(MICROSPHERE_SPRING_BOOT_LOGGING_LEVEL_PROPERTY_NAME, level);
         assertEquals(level, getLoggingLevel(environment));
     }