Add more tests for internationalization

It seems the I18nTest class was incomplete - I just had one test,
checking that English exists.  I guess my coverage-based approach didn't
catch it.

1 files changed, 57 insertions, 3 deletions

diff --git a/src/test/java/sevenUnitsGUI/I18nTest.java b/src/test/java/sevenUnitsGUI/I18nTest.java
index 1513373..78f5da4 100644
--- a/src/test/java/sevenUnitsGUI/I18nTest.java
+++ b/src/test/java/sevenUnitsGUI/I18nTest.java
@@ -16,9 +16,15 @@
  */
 package sevenUnitsGUI;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 
+import java.util.stream.Stream;
+
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
 
 /**
  * Tests for the internationalization system.
@@ -26,17 +32,65 @@ import org.junit.jupiter.api.Test;
  * @since v1.0.0
  */
 class I18nTest {
+	private static final Stream<Arguments> testLocalization() {
+		return Stream.of(
+				Arguments.of("tv.title", "en", "7Units [v]"),
+				Arguments.of("tv.title", "fr", "7Unités [v]"),
+				Arguments.of("tv.convert_units.title", "en", "Convert Units"),
+				Arguments.of("tv.convert_units.title", "fr", "Convertir Unités"));
+	}
+	
+	private static final Stream<String> testLocaleSupported() {
+		return Stream.of("en", "fr");
+	}
 
 	/**
-	 * Tests that the default locale exists.
+	 * Tests that the default locale is supported.
 	 * 
 	 * @since v1.0.0
+	 * @see Presenter#DEFAULT_LOCALE
 	 */
 	@Test
-	void testDefaultLocale() {
+	void testDefaultLocaleSupported() {
 		Presenter p = new Presenter(new ViewBot());
 		assertNotNull(p.locales.get(Presenter.DEFAULT_LOCALE),
-				"Default locale does not exist.");
+				"Default locale is not supported.");
+	}
+	
+	/**
+	 * Ensures that the system supports the provided locale.
+	 * 
+	 * @param localeName locale to test for support
+	 * 
+	 * @since 2025-06-04
+	 * @since v1.0.0
+	 */
+	@ParameterizedTest
+	@MethodSource
+	void testLocaleSupported(String localeName) {
+		Presenter p = new Presenter(new ViewBot());
+		assertNotNull(p.locales.get(localeName),
+				"Locale \"" + localeName + "\" is not supported.");
+	}
+
+	/**
+	 * Tests that the system can correctly localize text,
+	 * using the default locales.
+	 * 
+	 * @param key      key of text to localize
+	 * @param locale   locale to use
+	 * @param expected expected value of output text
+	 * 
+	 * @since 2025-06-04
+	 * @since v1.0.0
+	 */
+	@ParameterizedTest
+	@MethodSource
+	void testLocalization(String key, String locale, String expected) {
+		Presenter p = new Presenter(new ViewBot());
+		p.setUserLocale(locale);
+		String actual = p.getLocalizedText(key);
+		assertEquals(expected, actual);
 	}
 
 }