Readd (and fix) injector tests

injector/injector.gradle.kts

@@ -14,8 +14,10 @@ dependencies {
     vanillaDep(group = "net.runelite.rs", name = "vanilla", version = rsversion.toString())
 
     annotationProcessor(group = "org.projectlombok", name = "lombok", version = ProjectVersions.lombokVersion)
+    testAnnotationProcessor(group = "org.projectlombok", name = "lombok", version = ProjectVersions.lombokVersion)
 
     compileOnly(group = "org.projectlombok", name = "lombok", version = ProjectVersions.lombokVersion)
+    testCompileOnly(group = "org.projectlombok", name = "lombok", version = ProjectVersions.lombokVersion)
 
     implementation(gradleApi())
 
@@ -29,6 +31,8 @@ dependencies {
     implementation(group = "org.jetbrains", name = "annotations", version = "22.0.0")
     implementation(group = "com.google.guava", name = "guava", version = "30.1.1-jre")
     implementation(group = "net.sf.jopt-simple", name = "jopt-simple", version = "5.0.4")
+
+    testImplementation(group = "junit", name = "junit", version = "4.12")
 }
 
 tasks.register<JavaExec>("inject") {

injector/src/main/java/com/openosrs/injector/injection/InjectData.java

@@ -13,7 +13,9 @@ import com.openosrs.injector.rsapi.RSApi;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.function.BiConsumer;
+import lombok.AllArgsConstructor;
 import lombok.Getter;
+import lombok.NoArgsConstructor;
 import net.runelite.asm.ClassFile;
 import net.runelite.asm.ClassGroup;
 import net.runelite.asm.Field;
@@ -24,6 +26,8 @@ import net.runelite.asm.signature.Signature;
 /**
  * Abstract class meant as the interface of {@link com.openosrs.injector.Injector injection} for injectors
  */
+@AllArgsConstructor
+@NoArgsConstructor
 public abstract class InjectData
 {
 	public static final String HOOKS = "net/runelite/client/callback/Hooks";

injector/src/test/java/com/openosrs/injector/TestInjection.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2019, Lucas <https://github.com/Lucwousin>
+ * All rights reserved.
+ *
+ * This code is licensed under GPL3, see the complete license in
+ * the LICENSE file in the root directory of this source tree.
+ */
+package com.openosrs.injector;
+
+import com.openosrs.injector.injection.InjectData;
+import com.openosrs.injector.injectors.Injector;
+import com.openosrs.injector.rsapi.RSApi;
+import net.runelite.asm.ClassGroup;
+
+public class TestInjection extends InjectData
+{
+	public TestInjection(ClassGroup vanilla, ClassGroup deobfuscated, ClassGroup mixins, RSApi rsApi)
+	{
+		super(vanilla, deobfuscated, mixins, rsApi);
+	}
+
+	@Override
+	public void runChildInjector(Injector injector) throws InjectException
+	{
+		injector.inject();
+	}
+}

injector/src/test/java/com/openosrs/injector/injectors/MixinInjectorTest.java

@@ -0,0 +1,311 @@
+/*
+ * Copyright (c) 2017, Adam <Adam@sigterm.info>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.openosrs.injector.injectors;
+
+import com.google.common.io.ByteStreams;
+import com.openosrs.injector.TestInjection;
+import com.openosrs.injector.rsapi.RSApi;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.ListIterator;
+import java.util.Map;
+import javax.inject.Provider;
+import net.runelite.api.mixins.Copy;
+import net.runelite.api.mixins.Replace;
+import net.runelite.api.mixins.Shadow;
+import net.runelite.asm.ClassFile;
+import net.runelite.asm.ClassGroup;
+import net.runelite.asm.Field;
+import net.runelite.asm.Method;
+import static net.runelite.asm.Type.INT;
+import net.runelite.asm.attributes.code.Instruction;
+import net.runelite.asm.attributes.code.instructions.GetStatic;
+import net.runelite.asm.attributes.code.instructions.IMul;
+import net.runelite.asm.attributes.code.instructions.InvokeVirtual;
+import net.runelite.asm.attributes.code.instructions.LDC;
+import net.runelite.asm.signature.Signature;
+import net.runelite.asm.visitors.ClassFileVisitor;
+import net.runelite.deob.util.JarUtil;
+import net.runelite.mapping.ObfuscatedGetter;
+import net.runelite.mapping.ObfuscatedName;
+import net.runelite.mapping.ObfuscatedSignature;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import org.junit.Test;
+import org.objectweb.asm.ClassReader;
+import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
+import static org.objectweb.asm.Opcodes.ACC_STATIC;
+
+@ObfuscatedName("com/openosrs/injector/injectors/VanillaTarget")
+class DeobTarget
+{
+	@ObfuscatedName("ob_foo4")
+	@ObfuscatedGetter(intValue = 1157381415)
+	static int foo4;
+
+	@ObfuscatedName("ob_foo3")
+	@ObfuscatedSignature(
+		descriptor = "(I)V",
+		garbageValue = "123"
+	)
+	private void foo3()
+	{
+		// De-obfuscated foo3
+		System.out.println("foo3");
+	}
+}
+
+class VanillaTarget
+{
+	static int ob_foo4;
+
+	private void ob_foo3(int garbageValue)
+	{
+		// Obfuscated foo3
+		if (garbageValue != 123)
+		{
+			return;
+		}
+		System.out.println("foo3");
+	}
+}
+
+abstract class Source
+{
+	@net.runelite.api.mixins.Inject
+	private static int foo;
+	@Shadow("foo4")
+	private static int foo4;
+
+	@net.runelite.api.mixins.Inject
+	private void foo2()
+	{
+	}
+
+	@Copy("foo3")
+	@Replace("foo3")
+	private void copy$foo3()
+	{
+		System.out.println("replaced");
+		System.out.println(foo4);
+		copy$foo3();
+	}
+}
+
+// Test shadowing the "foo" field injected by Source
+abstract class Source2
+{
+	@Shadow("foo")
+	private static int foo;
+
+	@net.runelite.api.mixins.Inject
+	private void foo5()
+	{
+		System.out.println(foo);
+	}
+}
+
+public class MixinInjectorTest
+{
+	@Test
+	public void testInject() throws Exception
+	{
+		InputStream deobIn = getClass().getResourceAsStream("DeobTarget.class");
+		ClassFile deobTarget = JarUtil.loadClass(ByteStreams.toByteArray(deobIn));
+
+		ClassGroup deob = new ClassGroup();
+		deob.addClass(deobTarget);
+
+		InputStream vanillaIn = getClass().getResourceAsStream("VanillaTarget.class");
+		ClassFile vanillaTarget = JarUtil.loadClass(ByteStreams.toByteArray(vanillaIn));
+
+		ClassGroup vanilla = new ClassGroup();
+		vanilla.addClass(vanillaTarget);
+
+		Map<Provider<ClassFile>, List<ClassFile>> mixinClasses = new HashMap<>();
+		mixinClasses.put(() -> loadClass(Source.class), Collections.singletonList(vanillaTarget));
+		mixinClasses.put(() -> loadClass(Source2.class), Collections.singletonList(vanillaTarget));
+
+		TestInjection inject = new TestInjection(vanilla, deob, new ClassGroup(), new RSApi());
+		inject.initToVanilla();
+		new MixinInjector(inject).inject(mixinClasses);
+
+		// Check if "foo" has been injected
+		Field foo = vanillaTarget.findField("foo");
+		assertNotNull(foo);
+		assertEquals(INT, foo.getType());
+		assertEquals(ACC_PUBLIC | ACC_STATIC, foo.getAccessFlags());
+
+		// Check if "foo2()V" has been injected
+		Method foo2 = vanillaTarget.findMethod("foo2");
+		assertNotNull(foo2);
+		assertEquals(new Signature("()V"), foo2.getDescriptor());
+		assertEquals(ACC_PUBLIC, foo2.getAccessFlags());
+
+		// Check if "ob_foo3(I)V" was copied
+		Method foo3 = vanillaTarget.findMethod("copy$foo3");
+		assertNotNull(foo3);
+		assertEquals(new Signature("(I)V"), foo3.getDescriptor());
+		assertEquals(ACC_PUBLIC, foo3.getAccessFlags());
+
+		// Check if "ob_foo3(I)V" was replaced
+		Method ob_foo3 = vanillaTarget.findMethod("ob_foo3");
+		assertNotNull(ob_foo3);
+		assertEquals(new Signature("(I)V"), ob_foo3.getDescriptor());
+		assertEquals(ob_foo3
+			.getCode()
+			.getInstructions()
+			.getInstructions()
+			.stream()
+			.filter(i -> i instanceof LDC && ((LDC) i).getConstant().equals("replaced"))
+			.count(), 1);
+		// Check that the "foo4" field access in the new code body was mapped correctly
+		assertEquals(ob_foo3
+			.getCode()
+			.getInstructions()
+			.getInstructions()
+			.stream()
+			.filter(i ->
+			{
+				if (!(i instanceof GetStatic))
+				{
+					return false;
+				}
+
+				net.runelite.asm.pool.Field field = ((GetStatic) i).getField();
+
+				if (!field.getClazz().getName().equals("com/openosrs/injector/injectors/VanillaTarget"))
+				{
+					return false;
+				}
+
+				if (!field.getName().equals("ob_foo4"))
+				{
+					return false;
+				}
+
+				return true;
+			})
+			.count(), 1);
+
+		assert getStaticHasGetter(ob_foo3, "ob_foo4");
+		// Check that the "foo3()" call in the new code body was mapped to the copy
+		assertEquals(ob_foo3
+			.getCode()
+			.getInstructions()
+			.getInstructions()
+			.stream()
+			.filter(i ->
+			{
+				if (!(i instanceof InvokeVirtual))
+				{
+					return false;
+				}
+
+				net.runelite.asm.pool.Method method = ((InvokeVirtual) i).getMethod();
+
+				if (!method.getClazz().getName().equals("com/openosrs/injector/injectors/VanillaTarget"))
+				{
+					return false;
+				}
+
+				if (!method.getName().equals("copy$foo3"))
+				{
+					return false;
+				}
+
+				return true;
+			})
+			.count(), 1);
+
+		// Check if "foo5()V" was injected
+		Method foo5 = vanillaTarget.findMethod("foo5");
+		assertNotNull(foo5);
+		assertEquals(new Signature("()V"), foo5.getDescriptor());
+		assertEquals(ACC_PUBLIC, foo5.getAccessFlags());
+		// Check that the shadow "foo" field access was mapped correctly
+		assertEquals(foo5
+			.getCode()
+			.getInstructions()
+			.getInstructions()
+			.stream()
+			.filter(i ->
+			{
+				if (!(i instanceof GetStatic))
+				{
+					return false;
+				}
+
+				net.runelite.asm.pool.Field field = ((GetStatic) i).getField();
+
+				if (!field.getClazz().getName().equals("com/openosrs/injector/injectors/VanillaTarget"))
+				{
+					return false;
+				}
+
+				if (!field.getName().equals("foo"))
+				{
+					return false;
+				}
+
+				return true;
+			})
+			.count(), 1);
+	}
+
+	private boolean getStaticHasGetter(Method ob_foo3, String gottenField)
+	{
+		ListIterator<Instruction> it = ob_foo3.getCode().getInstructions().listIterator();
+		Instruction i;
+		while (it.hasNext() &&
+			!((i = it.next()) instanceof GetStatic &&
+			((GetStatic) i).getField().getName().equals(gottenField)));
+
+		return
+			(i = it.next()) instanceof LDC &&
+			((LDC) i).getConstantAsInt() == 1157381415 &&
+			it.next() instanceof IMul;
+	}
+
+	private static ClassFile loadClass(Class<?> clazz)
+	{
+		try (InputStream is = clazz.getClassLoader().getResourceAsStream(clazz.getName().replace('.', '/') + ".class"))
+		{
+			ClassReader reader = new ClassReader(is);
+			ClassFileVisitor cv = new ClassFileVisitor();
+
+			reader.accept(cv, 0);
+
+			return cv.getClassFile();
+		}
+		catch (IOException e)
+		{
+			throw new RuntimeException(e);
+		}
+	}
+}

injector/src/test/java/com/openosrs/injector/injectors/raw/DrawAfterWidgetsTest.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2018, Lotto <https://github.com/devLotto>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.openosrs.injector.injectors.raw;
+
+import com.google.common.io.ByteStreams;
+import com.openosrs.injector.InjectUtil;
+import com.openosrs.injector.TestInjection;
+import com.openosrs.injector.injection.InjectData;
+import com.openosrs.injector.rsapi.RSApi;
+import javax.swing.plaf.TabbedPaneUI;
+import net.runelite.asm.Annotation;
+import net.runelite.asm.ClassFile;
+import net.runelite.asm.ClassGroup;
+import net.runelite.asm.Field;
+import net.runelite.asm.Named;
+import net.runelite.asm.Type;
+import net.runelite.asm.attributes.Annotated;
+import net.runelite.deob.DeobAnnotations;
+import net.runelite.deob.util.JarUtil;
+import org.junit.Test;
+import static net.runelite.deob.DeobAnnotations.OBFUSCATED_NAME;
+import static net.runelite.deob.DeobAnnotations.OBFUSCATED_SIGNATURE;
+
+public class DrawAfterWidgetsTest
+{
+	@Test
+	public void testInjectDrawWidgetsRev160() throws Exception
+	{
+		// Rev 160 does not have the drawWidgets call inlined
+
+		ClassFile deobClient = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Client_deob160.class")));
+		ClassFile deobRasterizer = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Rasterizer2D_deob160.class")));
+
+		ClassGroup deob = new ClassGroup();
+		deob.addClass(deobClient);
+		deob.addClass(deobRasterizer);
+
+		ClassFile obClient = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Client_ob160.class")));
+		ClassFile obRasterizer = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Rasterizer2D_ob160.class")));
+
+		ClassGroup vanilla = new ClassGroup();
+		vanilla.addClass(obClient);
+		vanilla.addClass(obRasterizer);
+
+		InjectData inject = new TestInjection(vanilla, deob, new ClassGroup(), new RSApi());
+		addPhonyFields(deob, vanilla);
+		inject.initToVanilla();
+		new DrawAfterWidgets(inject).inject();
+	}
+
+	@Test
+	public void testInjectDrawWidgetsRev180() throws Exception
+	{
+		// Rev 180 has the drawWidgets call inlined
+
+		ClassFile deobClient = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Client_deob180.class")));
+		ClassFile deobRasterizer = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Rasterizer2D_deob180.class")));
+
+		ClassGroup deob = new ClassGroup();
+		deob.addClass(deobClient);
+		deob.addClass(deobRasterizer);
+
+		ClassFile obClient = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Client_ob180.class")));
+		ClassFile obRasterizer = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Rasterizer2D_ob180.class")));
+
+		ClassGroup vanilla = new ClassGroup();
+		vanilla.addClass(obClient);
+		vanilla.addClass(obRasterizer);
+
+		InjectData inject = new TestInjection(vanilla, deob, new ClassGroup(), new RSApi());
+		addPhonyFields(deob, vanilla);
+		inject.initToVanilla();
+		new DrawAfterWidgets(inject).inject();
+	}
+
+	private static void addPhonyFields(ClassGroup deob, ClassGroup vanilla)
+	{
+		final ClassFile d = deob.findClass("Client");
+		final ClassFile v = vanilla.findClass("client");
+		final Field clientD = new Field(d, "client", new Type("LClient;"));
+		clientD.findAnnotation(OBFUSCATED_NAME, true).setElement("obclient");
+		clientD.findAnnotation(OBFUSCATED_SIGNATURE, true).setElement("descriptor", "Lclient;");
+		clientD.setStatic();
+		d.addField(clientD);
+		final Field clientV = new Field(v, "obclient", new Type("Lclient;"));
+		clientV.setStatic();
+		v.addField(clientV);
+		final Field callbacks = new Field(v, "callbacks", new Type("LCallbacks;"));
+		v.addField(callbacks);
+	}
+}

injector/src/test/java/com/openosrs/injector/injectors/raw/DrawMenuTest.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2019, Lucas <https://github.com/Lucwousin>
+ * All rights reserved.
+ *
+ * This code is licensed under GPL3, see the complete license in
+ * the LICENSE file in the root directory of this source tree.
+ */
+package com.openosrs.injector.injectors.raw;
+
+import com.google.common.io.ByteStreams;
+import com.openosrs.injector.TestInjection;
+import com.openosrs.injector.injection.InjectData;
+import com.openosrs.injector.rsapi.RSApi;
+import net.runelite.asm.ClassFile;
+import net.runelite.asm.ClassGroup;
+import net.runelite.deob.util.JarUtil;
+import org.junit.Test;
+
+public class DrawMenuTest
+{
+	@Test
+	public void test160() throws Exception
+	{
+		// 160 has both drawMenu and drawTopLeftText inlined
+		ClassFile deobClient = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Client_deob160.class")));
+		ClassFile obClient = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Client_ob160.class")));
+
+		ClassGroup van = new ClassGroup();
+		van.addClass(obClient);
+		ClassGroup deob = new ClassGroup();
+		deob.addClass(deobClient);
+
+		InjectData inject = new TestInjection(van, deob, new ClassGroup(), new RSApi());
+		inject.initToVanilla();
+		new DrawMenu(inject).inject();
+	}
+
+	@Test
+	public void test180() throws Exception
+	{
+		// 180 has only drawMenu inlined
+		ClassFile deobClient = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Client_deob180.class")));
+		ClassFile obClient = JarUtil.loadClass(ByteStreams.toByteArray(getClass().getResourceAsStream("/drawafterwidgets/Client_ob180.class")));
+
+		ClassGroup van = new ClassGroup();
+		van.addClass(obClient);
+		ClassGroup deob = new ClassGroup();
+		deob.addClass(deobClient);
+
+		InjectData inject = new TestInjection(van, deob, new ClassGroup(), new RSApi());
+		inject.initToVanilla();
+		new DrawMenu(inject).inject();
+	}
+}

injector/src/test/java/com/openosrs/injector/transformers/SourceChangerTest.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2020, Lucas <https://github.com/Lucwousin>
+ * All rights reserved.
+ *
+ * This code is licensed under GPL3, see the complete license in
+ * the LICENSE file in the root directory of this source tree.
+ */
+package com.openosrs.injector.transformers;
+
+import com.openosrs.injector.InjectException;
+import com.openosrs.injector.injection.InjectData;
+import com.openosrs.injector.injectors.Injector;
+import com.openosrs.injector.transformers.srcchangeclasses.NewName;
+import com.openosrs.injector.transformers.srcchangeclasses.OldName;
+import java.lang.invoke.MethodHandles;
+import java.util.function.BiConsumer;
+import net.runelite.asm.ClassFile;
+import net.runelite.asm.ClassGroup;
+import net.runelite.asm.objectwebasm.NonloadingClassWriter;
+import net.runelite.asm.visitors.ClassFileVisitor;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassWriter;
+
+public class SourceChangerTest
+{
+	private static final String PACKAGE = "com.openosrs.injector.transformers.srcchangeclasses.";
+
+	@Test
+	@Ignore // Ignored because it's not really testing anything atm, but it works!
+	public void test() throws Exception
+	{
+		final ClassFileVisitor deob = new ClassFileVisitor(), vann = new ClassFileVisitor();
+		new ClassReader(PACKAGE + "NewName").accept(deob, ClassReader.SKIP_FRAMES);
+		new ClassReader(PACKAGE + "OldName").accept(vann, ClassReader.SKIP_FRAMES);
+
+		new SourceChanger(
+			new InjectData(new ClassGroup(), new ClassGroup(), null, null) {
+				public void runChildInjector(Injector injector) throws InjectException
+				{}
+
+				@Override
+				public void forEachPair(BiConsumer<ClassFile, ClassFile> consumer)
+				{
+					consumer.accept(deob.getClassFile(), vann.getClassFile());
+				}
+			}).transformImpl();
+
+		final ClassGroup group = new ClassGroup();
+		group.addClass(vann.getClassFile());
+
+		final ClassWriter cw = new NonloadingClassWriter(group, 0);
+		vann.getClassFile().accept(cw);
+
+		OldName obj = (OldName) MethodHandles.privateLookupIn(
+				NewName.class,
+				MethodHandles.lookup())
+			.defineClass(cw.toByteArray())
+			.getDeclaredConstructor()
+			.newInstance();
+
+		obj.obfMethodName();
+	}
+}

injector/src/test/java/com/openosrs/injector/transformers/srcchangeclasses/NewName.java

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2020, Lucas <https://github.com/Lucwousin>
+ * All rights reserved.
+ *
+ * This code is licensed under GPL3, see the complete license in
+ * the LICENSE file in the root directory of this source tree.
+ */
+package com.openosrs.injector.transformers.srcchangeclasses;
+
+public class NewName
+{
+	public void deobMethodName()
+	{
+		// do something interesting
+	}
+}

injector/src/test/java/com/openosrs/injector/transformers/srcchangeclasses/OldName.java

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2020, Lucas <https://github.com/Lucwousin>
+ * All rights reserved.
+ *
+ * This code is licensed under GPL3, see the complete license in
+ * the LICENSE file in the root directory of this source tree.
+ */
+package com.openosrs.injector.transformers.srcchangeclasses;
+
+public class OldName
+{
+	public void obfMethodName()
+	{
+		new RuntimeException().printStackTrace();
+	}
+}