test: add test for createReference (INRIA#4078)

Author: Rohitesh-Kumar-Jain

src/test/java/spoon/test/factory/MethodFactoryTest.java

@@ -0,0 +1,61 @@
+package spoon.test.factory;
+
+import org.junit.jupiter.api.Test;
+import spoon.Launcher;
+import spoon.reflect.declaration.CtClass;
+import spoon.reflect.declaration.CtMethod;
+import spoon.reflect.factory.Factory;
+import spoon.reflect.factory.MethodFactory;
+import spoon.reflect.reference.CtExecutableReference;
+import spoon.reflect.reference.CtTypeReference;
+import spoon.test.factory.testclasses4.Bar;
+
+import java.lang.reflect.Method;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.CoreMatchers.is;
+
+public class MethodFactoryTest {
+
+    @Test
+    public void testCreateReference() {
+        // contract: createReference creates a method reference of the foo method
+
+        Factory factory = new Launcher().getFactory();
+        CtClass<?> testClass = factory.Class().get(Bar.class);
+        CtMethod<?> foo = testClass.getMethodsByName("foo").get(0);
+        CtExecutableReference<?> expectedReference = testClass.getMethod("foo").getReference();
+        MethodFactory methodFactory = testClass.getFactory().Method();
+        CtExecutableReference<?> actualCreatedReference = null;
+
+        actualCreatedReference = methodFactory.createReference(foo);
+
+        assertThat(actualCreatedReference, is(expectedReference));
+    }
+
+    @Test
+    public void testCreateReferenceWithActualMethod() throws ClassNotFoundException, NoSuchMethodException {
+        // contract: createReference creates a method reference of a actual method foo
+
+        // arrange
+        Launcher launcher = new Launcher();
+        Factory factory = launcher.getFactory();
+        Class<?> testClass = Class.forName("spoon.test.factory.testclasses4.Bar");
+        Method testMethod = testClass.getMethod("foo");
+
+        CtExecutableReference<Void> expectedReference = factory.createExecutableReference();
+        expectedReference.setSimpleName("foo");
+        CtTypeReference<?> ctTypeReference = factory.Type().createReference(Bar.class);
+        expectedReference.setDeclaringType(ctTypeReference);
+        expectedReference.setType(launcher.getFactory().Type().voidPrimitiveType());
+
+        MethodFactory methodFactory = factory.Method();
+        CtExecutableReference<?> actualCreatedReference = null;
+
+        // act
+        actualCreatedReference = methodFactory.createReference(testMethod);
+
+        // assert
+        assertThat(actualCreatedReference, is(expectedReference));
+    }
+}

src/test/java/spoon/test/factory/testclasses4/Bar.java

@@ -0,0 +1,6 @@
+package spoon.test.factory.testclasses4;
+
+public class Bar {
+
+    public void foo() { }
+}