HSEARCH-3525 Add some basic unit tests for property handles

Since we're declaring some property handles classes that are not used in
our integration tests, but will be used in Quarkus, we need some basic
testing.

mapper/pojo/src/test/java/org/hibernate/search/mapper/pojo/model/spi/PropertyHandleTest.java

@@ -0,0 +1,186 @@
+/*
+ * Hibernate Search, full-text search for your domain model
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.search.mapper.pojo.model.spi;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.AccessibleObject;
+import java.lang.reflect.Field;
+import java.lang.reflect.Member;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+@RunWith(Parameterized.class)
+public class PropertyHandleTest {
+
+	@Parameterized.Parameters(name = "{0}")
+	public static List<Object[]> data() {
+		MethodHandles.Lookup lookup = MethodHandles.lookup();
+		return Arrays.asList( new Object[][] {
+				{ PropertyHandleFactory.usingMethodHandle( lookup ) },
+				{ PropertyHandleFactory.usingJavaLangReflect() }
+		} );
+	}
+
+	private final PropertyHandleFactory factory;
+
+	public PropertyHandleTest(PropertyHandleFactory factory) {
+		this.factory = factory;
+	}
+
+	@Test
+	public void privateField() throws Exception {
+		testFieldPropertyHandle( "privateField" );
+	}
+
+	@Test
+	public void privateFinalField() throws Exception {
+		testFieldPropertyHandle( "privateFinalField" );
+	}
+
+	@Test
+	public void packagePrivateField() throws Exception {
+		testFieldPropertyHandle( "packagePrivateField" );
+	}
+
+	@Test
+	public void packagePrivateFinalField() throws Exception {
+		testFieldPropertyHandle( "packagePrivateFinalField" );
+	}
+
+	@Test
+	public void protectedField() throws Exception {
+		testFieldPropertyHandle( "protectedField" );
+	}
+
+	@Test
+	public void protectedFinalField() throws Exception {
+		testFieldPropertyHandle( "protectedFinalField" );
+	}
+
+	@Test
+	public void publicField() throws Exception {
+		testFieldPropertyHandle( "publicField" );
+	}
+
+	@Test
+	public void publicFinalField() throws Exception {
+		testFieldPropertyHandle( "publicFinalField" );
+	}
+
+	@Test
+	public void privateMethod() throws Exception {
+		testMethodPropertyHandle( "privateMethod" );
+	}
+
+	@Test
+	public void packagePrivateMethod() throws Exception {
+		testMethodPropertyHandle( "packagePrivateMethod" );
+	}
+
+	@Test
+	public void protectedMethod() throws Exception {
+		testMethodPropertyHandle( "protectedMethod" );
+	}
+
+	@Test
+	public void publicMethod() throws Exception {
+		testMethodPropertyHandle( "publicMethod" );
+	}
+
+	private void testFieldPropertyHandle(String fieldName) throws IllegalAccessException, NoSuchFieldException {
+		String propertyName = fieldName + "PropertyName";
+		String expectedValue = fieldName + "Value";
+		Field field = EntityType.class.getDeclaredField( fieldName );
+		setAccessible( field );
+		Field otherField = EntityType.class.getDeclaredField( "otherField" );
+		setAccessible( otherField );
+
+		PropertyHandle propertyHandle = factory.createForField( propertyName, field );
+
+		assertThat( propertyHandle.getName() ).isEqualTo( propertyName );
+		assertThat( propertyHandle.get( new EntityType() ) ).isEqualTo( expectedValue );
+
+		assertThat( propertyHandle.toString() )
+				.contains( propertyHandle.getClass().getSimpleName() )
+				.contains( field.toString() );
+
+		PropertyHandle equalPropertyHandle = factory.createForField( propertyName, field );
+		PropertyHandle differentNamePropertyHandle = factory.createForField( propertyName + "foo", field );
+		PropertyHandle differentFieldPropertyHandle = factory.createForField( propertyName, otherField );
+		assertThat( propertyHandle ).isEqualTo( equalPropertyHandle );
+		assertThat( propertyHandle.hashCode() ).isEqualTo( equalPropertyHandle.hashCode() );
+		assertThat( propertyHandle ).isNotEqualTo( differentNamePropertyHandle );
+		assertThat( propertyHandle ).isNotEqualTo( differentFieldPropertyHandle );
+	}
+
+	private void testMethodPropertyHandle(String methodName) throws IllegalAccessException, NoSuchMethodException {
+		String propertyName = methodName + "PropertyName";
+		String expectedValue = methodName + "Value";
+		Method method = EntityType.class.getDeclaredMethod( methodName );
+		setAccessible( method );
+		Method otherMethod = EntityType.class.getDeclaredMethod( "otherMethod" );
+		setAccessible( otherMethod );
+
+		PropertyHandle propertyHandle = factory.createForMethod( propertyName, method );
+		assertThat( propertyHandle.getName() ).isEqualTo( propertyName );
+		assertThat( propertyHandle.get( new EntityType() ) ).isEqualTo( expectedValue );
+
+		assertThat( propertyHandle.toString() )
+				.contains( propertyHandle.getClass().getSimpleName() )
+				.contains( method.toString() );
+
+		PropertyHandle equalPropertyHandle = factory.createForMethod( propertyName, method );
+		PropertyHandle differentNamePropertyHandle = factory.createForMethod( propertyName + "foo", method );
+		PropertyHandle differentMethodPropertyHandle = factory.createForMethod( propertyName + "foo", otherMethod );
+		assertThat( propertyHandle ).isEqualTo( equalPropertyHandle );
+		assertThat( propertyHandle.hashCode() ).isEqualTo( equalPropertyHandle.hashCode() );
+		assertThat( propertyHandle ).isNotEqualTo( differentNamePropertyHandle );
+		assertThat( propertyHandle ).isNotEqualTo( differentMethodPropertyHandle );
+	}
+
+	private static void setAccessible(Member member) {
+		if ( !Modifier.isPublic( member.getModifiers() ) ) {
+			( (AccessibleObject) member ).setAccessible( true );
+		}
+	}
+
+	private static class EntityType {
+		private String privateField = "privateFieldValue";
+		private final String privateFinalField = "privateFinalFieldValue";
+		String packagePrivateField = "packagePrivateFieldValue";
+		final String packagePrivateFinalField = "packagePrivateFinalFieldValue";
+		protected String protectedField = "protectedFieldValue";
+		protected final String protectedFinalField = "protectedFinalFieldValue";
+		public String publicField = "publicFieldValue";
+		public final String publicFinalField = "publicFinalFieldValue";
+		private String otherField;
+
+		private String privateMethod() {
+			return "privateMethodValue";
+		}
+		String packagePrivateMethod() {
+			return "packagePrivateMethodValue";
+		}
+		protected String protectedMethod() {
+			return "protectedMethodValue";
+		}
+		public String publicMethod() {
+			return "publicMethodValue";
+		}
+		public String otherMethod() {
+			return "otherMethod";
+		}
+	}
+}