feat: Replace Camel case uppercase with Pascal case

The main modification is in `NamingConvention.java` replacing the enumeration `CAMEL_CASE_UPPERCASE` with `PASCAL_CASE`. This change can help to improve the readability of the code by reducing the verbosity of names and ensure convention consistency. Also, a new test file `NamingConventionTest.java` has been introduced to ensure correctness and stability of the code against these modifications.

src/main/java/de/marhali/easyi18n/settings/presets/NamingConvention.java

@@ -10,7 +10,7 @@
  */
 public enum NamingConvention {
     CAMEL_CASE("Camel Case"),
-    CAMEL_CASE_UPPERCASE("Camel Case (Uppercase)"),
+    PASCAL_CASE("Pascal Case"),
     SNAKE_CASE("Snake Case"),
     SNAKE_CASE_UPPERCASE("Snake Case (Uppercase)");
 
@@ -76,7 +76,7 @@ static public String convertKeyToConvention(String key, NamingConvention convent
                 yield formatToSnakeCase(newKey, true);
             case CAMEL_CASE:
                 yield formatToCamelCase(newKey, false);
-            case CAMEL_CASE_UPPERCASE:
+            case PASCAL_CASE:
                 yield formatToCamelCase(newKey, true);
 
         };

src/test/java/de/marhali/easyi18n/settings/NamingConventionTest.java

@@ -0,0 +1,35 @@
+package de.marhali.easyi18n.settings;
+
+import com.intellij.testFramework.fixtures.BasePlatformTestCase;
+import de.marhali.easyi18n.settings.presets.NamingConvention;
+
+import java.io.IOException;
+
+public class NamingConventionTest extends BasePlatformTestCase {
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+    }
+
+    public void testConvertToNamingConvention() throws IOException {
+        assertEquals("helloWorld", NamingConvention.convertKeyToConvention("Hello World", NamingConvention.CAMEL_CASE));
+        assertEquals("hello_world", NamingConvention.convertKeyToConvention("Hello World", NamingConvention.SNAKE_CASE));
+        assertEquals("HelloWorld", NamingConvention.convertKeyToConvention("Hello World", NamingConvention.PASCAL_CASE));
+        assertEquals("HELLO_WORLD", NamingConvention.convertKeyToConvention("Hello World", NamingConvention.SNAKE_CASE_UPPERCASE));
+    }
+
+    public void testGetEnumNames() throws Exception {
+        String[] expected = {"Camel Case", "Pascal Case", "Snake Case", "Snake Case (Uppercase)"};
+        String[] actual = NamingConvention.getEnumNames();
+        assertEquals(expected.length, actual.length);
+    }
+
+
+    public void testFromString() {
+        assertEquals(NamingConvention.CAMEL_CASE, NamingConvention.fromString("Camel Case"));
+        assertEquals(NamingConvention.PASCAL_CASE, NamingConvention.fromString("Pascal Case"));
+        assertEquals(NamingConvention.SNAKE_CASE, NamingConvention.fromString("Snake Case"));
+        assertEquals(NamingConvention.SNAKE_CASE_UPPERCASE, NamingConvention.fromString("Snake Case (Uppercase)"));
+        assertEquals(NamingConvention.CAMEL_CASE, NamingConvention.fromString("Invalid Input"));
+    }
+}