SONARJAVA-5678 Add example of false negative for S7479 to fix quality gate (#5244)

Author: romainbrenguier

java-checks-test-sources/default/src/main/java/checks/ClassBuilderWithMethodCheckSample.java

@@ -1,8 +1,10 @@
 package checks;
 
 import java.lang.classfile.ClassBuilder;
+import java.lang.classfile.MethodBuilder;
 import java.lang.classfile.attribute.ExceptionsAttribute;
 import java.lang.constant.ClassDesc;
+import java.util.function.Consumer;
 
 import static java.lang.classfile.ClassFile.ACC_PUBLIC;
 import static java.lang.classfile.ClassFile.ACC_STATIC;
@@ -64,4 +66,12 @@ ClassBuilder addMethodCompliantWithCall(ClassBuilder builder) {
           .invokevirtual(ClassDesc.of("java.io.PrintStream"), "println", MTD_void)
           .return_()));
   }
+
+  ClassBuilder addMethodFalseNegativeNotALambda(ClassBuilder builder) {
+    Consumer<MethodBuilder> consumer = methodBuilder -> methodBuilder
+      .withCode(codeBuilder -> {});
+    return builder
+      // False negative, because we don't support case where the last argument is not a lambda
+      .withMethod("foo", MTD_void, ACC_PUBLIC | ACC_STATIC, consumer);
+  }
 }