Add basic tests

Beethoven.iml

@@ -4,6 +4,7 @@
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />

test/MergeInject.java

@@ -0,0 +1,20 @@
+import dev.w1zzrd.asm.InjectClass;
+import dev.w1zzrd.asm.Inject;
+import dev.w1zzrd.asm.Merger;
+
+@InjectClass(value = MergeTest.class)
+public class MergeInject implements Runnable {
+
+    @Inject
+    public String test(){
+        System.out.println(Merger.field("s"));
+        return "Modified";
+    }
+
+    @Override
+    @Inject
+    public void run() {
+        for (int i = 0; i < 5; ++i)
+            System.out.println(test());
+    }
+}

test/MergeTest.java

@@ -0,0 +1,21 @@
+public class MergeTest {
+
+    private String s = "Hello";
+
+
+    public MergeTest(){
+
+    }
+
+    public MergeTest(String s) {
+        this.s = s;
+    }
+
+    public String test(){
+        return s;
+    }
+
+    public String test1(){
+        return s;
+    }
+}

test/Test.java

@@ -0,0 +1,14 @@
+import dev.w1zzrd.asm.Merger;
+
+import java.io.IOException;
+
+public class Test {
+    public static void main(String... args) throws IOException {
+        Merger m = new Merger("MergeTest");
+        m.inject(Merger.getClassNode("MergeInject"));
+        m.compile();
+
+        Runnable r = (Runnable)new MergeTest("Constructor message");
+        r.run();
+    }
+}