Added/updated tests

src/test/java/de/rwu/easydrop/util/ConfigImplTest.java

@@ -1,6 +1,7 @@
 package de.rwu.easydrop.util;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.fail;
 
@@ -34,7 +35,9 @@ class ConfigImplTest {
     }
 
     @Test
-    void testGetProperty_ConfigNotLoaded() {
+    void testGetProperty_ConfigNotLoaded() throws Exception {
+        config.reset();
+
         NoSuchElementException exception = assertThrows(NoSuchElementException.class, () -> {
             config.getProperty(TESTDATA_KEY);
         });
@@ -92,4 +95,19 @@ class ConfigImplTest {
 
         assertEquals("Couldn't load required config file", exception.getMessage());
     }
+
+    @Test
+    void testReset() throws ConfigurationException {
+        config.setConfigLocation("src/test/resources/testdata.properties");
+        config.loadConfig();
+
+        assertNotNull(config.getProperty(TESTDATA_KEY));
+        config.reset();
+
+        NoSuchElementException exception = assertThrows(NoSuchElementException.class, () -> {
+            config.getProperty(TESTDATA_KEY);
+        });
+
+        assertEquals("Config has not been loaded", exception.getMessage());
+    }
 }