Use strategy pattern in Language enum

Add test

Author: grumpyf0x48

src/Application.java

@@ -15,7 +15,7 @@ void sayHello(ParsedArgs parsedArgs) {
     if (parsedArgs.hasHelpFlag()) {
         printHelp();
     } else {
-        IO.println(parsedArgs.getLanguage().getGreeting());
+        IO.println(parsedArgs.getLanguage().greet());
     }
 }
 

src/Greeter.java

@@ -0,0 +1,3 @@
+interface Greeter {
+    String greet();
+}

src/Language.java

@@ -1,21 +1,19 @@
 import module java.base;
 
-enum Language {
+enum Language implements Greeter {
 
-    French("Bonjour", new int[]{0x1F1EB, 0x1F1F7}),
-    English("Hello", new int[]{0x1F1EC, 0x1F1E7});
-
-    private final String message;
-    private final int[] emoji;
-
-    Language(String message, int[] emoji) {
-        this.message = message;
-        this.emoji = emoji;
-    }
-
-    String getGreeting() {
-        return "%s %s%s".formatted(message, Character.toString(emoji[0]), Character.toString(emoji[1]));
-    }
+    French() {
+        @Override
+        public String greet() {
+            return "Bonjour 🇫🇷";
+        }
+    },
+    English() {
+        @Override
+        public String greet() {
+            return "Hello 🇬🇧";
+        }
+    };
 
     static Optional<Language> fromString(String language) {
         return Arrays.stream(values())

src/LanguageTest.java

@@ -14,7 +14,12 @@ void failingTest() {
     assert false : "Test was expected to fail.";
 }
 
-void getGreetingTest() {
-    String greeting = Language.French.getGreeting();
-    assert greeting.equals("Bonjour 🇫🇷") : "Incorrect greeting returned";
+void frenchGreetTest() {
+    String greet = Language.French.greet();
+    assert greet.equals("Bonjour 🇫🇷") : "Incorrect greet returned";
 }
+
+void englishGreetTest() {
+    String greet = Language.French.greet();
+    assert greet.equals("Hello 🇬🇧") : "Incorrect greet returned";
+}