Fix reserveMethodNames to reserve each supplied name

GeneratedClass.reserveMethodNames(String...) passed the entire varargs
array to MethodName.of() inside the per-name loop instead of the current
element. Since MethodName.of(String...) joins all parts into a single
camel-case name, reserving two or more names (for example "apply" and
"test") produced "applyTest", and the per-element check
Assert.state(generatedName.equals(reservedMethodName)) failed with an
IllegalStateException. Single-name calls worked only by accident.

Reserve each supplied name individually by passing the loop variable.

Signed-off-by: junhyeong9812 <pickjog@gmail.com>

spring-core/src/main/java/org/springframework/aot/generate/GeneratedClass.java

@@ -81,7 +81,7 @@ public final class GeneratedClass {
 	 */
 	public void reserveMethodNames(String... reservedMethodNames) {
 		for (String reservedMethodName : reservedMethodNames) {
-			String generatedName = generateSequencedMethodName(MethodName.of(reservedMethodNames));
+			String generatedName = generateSequencedMethodName(MethodName.of(reservedMethodName));
 			Assert.state(generatedName.equals(reservedMethodName),
 					() -> String.format("Unable to reserve method name '%s'", reservedMethodName));
 		}

spring-core/src/test/java/org/springframework/aot/generate/GeneratedClassTests.java

@@ -78,6 +78,14 @@ class GeneratedClassTests {
 		assertThat(generatedMethod.getName()).isEqualTo("apply1");
 	}
 
+	@Test
+	void reserveMethodNamesWhenMultipleNamesReservesEachName() {
+		GeneratedClass generatedClass = createGeneratedClass(TEST_CLASS_NAME);
+		generatedClass.reserveMethodNames("apply", "test");
+		assertThat(generatedClass.getMethods().add("apply", emptyMethodCustomizer).getName()).isEqualTo("apply1");
+		assertThat(generatedClass.getMethods().add("test", emptyMethodCustomizer).getName()).isEqualTo("test1");
+	}
+
 	@Test
 	void generateMethodNameWhenAllEmptyPartsGeneratesSetName() {
 		GeneratedClass generatedClass = createGeneratedClass(TEST_CLASS_NAME);