refactor: use JUnit 5 expectations

* JUnit 5 has a better way to assert on an expected exception.
* Cleaned up an unncessary type specification.
* Fixed a typo.
* Cleaned up an import.

metrics-data/src/test/java/org/cloudfoundry/identity/uaa/util/JsonUtilsTest.java

@@ -10,8 +10,8 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.junit.jupiter.api.Assertions.fail;
 
 class JsonUtilsTest {
   private static final String jsonTestObjectString = "{\"pattern\":\"/pattern\",\"group\":\"group\",\"limit\":1000,\"category\":\"category\"}";
@@ -69,13 +69,10 @@ void testSerializeExcludingProperties() {
 
   @Test
   void testSerializeExcludingPropertiesInnerCallFails() {
-    Map<String, String> groupProperties = JsonUtils.readValue(jsonTestObjectString, new TypeReference<Map<String, String>>() {});
-    try {
-      JsonUtils.serializeExcludingProperties(groupProperties, "limit.unkonwn");
-      fail("not expected");
-    } catch (Exception e) {
-      assertTrue(e instanceof JsonUtils.JsonUtilException);
-    }
+    Map<String, String> groupProperties = JsonUtils.readValue(jsonTestObjectString, new TypeReference<>() {});
+    assertThrows(JsonUtils.JsonUtilException.class, () -> {
+      JsonUtils.serializeExcludingProperties(groupProperties, "limit.unknown");
+    });
   }
 
   @Test