Added test cases to validate the default config and language files.

src/test/java/com/nisovin/shopkeepers/config/ConfigTests.java

@@ -0,0 +1,72 @@
+package com.nisovin.shopkeepers.config;
+
+import static com.nisovin.shopkeepers.config.ConfigHelper.toConfigKey;
+
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.bukkit.configuration.Configuration;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.nisovin.shopkeepers.Messages;
+import com.nisovin.shopkeepers.Settings;
+
+public class ConfigTests {
+
+	private List<String> getConfigClassKeys(Class<?> configClass) {
+		Field[] fields = configClass.getDeclaredFields();
+		List<String> keys = new ArrayList<>(fields.length);
+		for (Field field : fields) {
+			if (field.isSynthetic()) continue;
+			if (!Modifier.isPublic(field.getModifiers())) {
+				continue;
+			}
+			String configKey = toConfigKey(field.getName());
+			keys.add(configKey);
+		}
+		return keys;
+	}
+
+	private Configuration loadConfigFromResource(String resourcePath) {
+		InputStream configResource = this.getClass().getClassLoader().getResourceAsStream(resourcePath);
+		return YamlConfiguration.loadConfiguration(new InputStreamReader(configResource));
+	}
+
+	@Test
+	public void testDefaultConfigConsistency() {
+		// Expected default config:
+		List<String> expectedKeys = this.getConfigClassKeys(Settings.class);
+
+		// Actual default config:
+		Configuration defaultConfig = this.loadConfigFromResource("config.yml");
+		List<String> actualKeys = new ArrayList<>(defaultConfig.getKeys(false));
+
+		// This checks: Missing keys, unexpected keys, order of keys, duplication of keys.
+		Assert.assertEquals("Default config keys do not match the expected keys!", expectedKeys, actualKeys);
+	}
+
+	@Test
+	public void testDefaultLanguageFilesConsistency() {
+		// Expected messages:
+		List<String> expectedKeys = this.getConfigClassKeys(Messages.class);
+
+		// Actual default language files:
+		String[] languageFilePaths = new String[] {
+			"lang/language-en-default.yml",
+			"lang/language-de.yml"
+		};
+		for (String languageFilePath : languageFilePaths) {
+			Configuration languageFile = this.loadConfigFromResource(languageFilePath);
+			List<String> actualKeys = new ArrayList<>(languageFile.getKeys(false));
+			// This checks: Missing keys, unexpected keys, order of keys, duplication of keys.
+			Assert.assertEquals("Keys of default language file '" + languageFilePath + "' do not match the expected keys!",
+					expectedKeys, actualKeys);
+		}
+	}
+}