#39 Fixed tests and added some more

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

@@ -0,0 +1,95 @@
+package de.rwu.easydrop.util;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.fail;
+
+import java.util.NoSuchElementException;
+
+import javax.naming.ConfigurationException;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class ConfigImplTest {
+    private Config config;
+    private final static String TESTDATA_PATH = "testResources/testdata.properties";
+    private final static String TESTDATA_KEY = "API_KEY";
+    private final static String TESTDATA_VAL = "keyIsHere";
+
+    @BeforeEach
+    void setUp() {
+        config = Config.getInstance();
+    }
+
+    @Test
+    void testGetProperty_ExistingKey() throws ConfigurationException {
+        config.setConfigLocation(TESTDATA_PATH);
+        config.loadConfig();
+        config.setProperty(TESTDATA_KEY, TESTDATA_VAL);
+
+        String value = config.getProperty(TESTDATA_KEY);
+
+        assertEquals(TESTDATA_VAL, value);
+    }
+
+    @Test
+    void testGetProperty_ConfigNotLoaded() {
+        NoSuchElementException exception = assertThrows(NoSuchElementException.class, () -> {
+            config.getProperty(TESTDATA_KEY);
+        });
+
+        assertEquals("Config has not been loaded", exception.getMessage());
+    }
+
+    @Test
+    void testGetProperty_NonExistingKey() {
+        try {
+            config.setConfigLocation(TESTDATA_PATH);
+            config.loadConfig();
+
+            NoSuchElementException exception = assertThrows(NoSuchElementException.class, () -> {
+                config.getProperty("I_DONT_EXIST");
+            });
+
+            assertEquals("Requested config value does not exist", exception.getMessage());
+        } catch (ConfigurationException e) {
+            fail("ConfigurationException should not be thrown");
+        }
+    }
+
+    @Test
+    void testSetProperty() {
+        try {
+            config.setConfigLocation(TESTDATA_PATH);
+            config.loadConfig();
+            config.setProperty(TESTDATA_KEY, "12345");
+
+            assertEquals("12345", config.getProperty(TESTDATA_KEY));
+        } catch (ConfigurationException e) {
+            fail("ConfigurationException should not be thrown");
+        }
+    }
+
+    @Test
+    void testLoadConfigSuccessfully() {
+        try {
+            config.setConfigLocation("testResources/testdata.properties");
+            config.loadConfig();
+            assertEquals(TESTDATA_VAL, config.getProperty(TESTDATA_KEY));
+        } catch (ConfigurationException e) {
+            fail("ConfigurationException should not be thrown");
+        }
+    }
+
+    @Test
+    void testLoadConfigMissingFile() {
+        config.setConfigLocation("path/that/doesnt/exist/config.properties");
+
+        ConfigurationException exception = assertThrows(ConfigurationException.class, () -> {
+            config.loadConfig();
+        });
+
+        assertEquals("Couldn't load required config file", exception.getMessage());
+    }
+}