diff --git a/meson.build b/meson.build
index d7dd47e..0e929e1 100644
--- a/meson.build
+++ b/meson.build
@@ -51,4 +51,19 @@ qjs = executable('qjs',
   'qjs.c', 'quickjs-libc.c', qjscalc_c, qjsrepl_c,
   dependencies: [quickjs_dep, threads],
   build_by_default:false
-)
\ No newline at end of file
+)
+
+test_root = join_paths(meson.project_source_root(), 'tests')
+
+test('closure', qjs, args: ['test_closure.js'], workdir: test_root)
+test('language', qjs, args: ['test_language.js'], workdir: test_root)
+test('builtin', qjs, args: ['test_builtin.js'], workdir: test_root)
+test('loop', qjs, args: ['test_loop.js'], workdir: test_root)
+test('std', qjs, args: ['test_std.js'], workdir: test_root)
+test('worker', qjs, args: ['test_worker.js'], workdir: test_root)
+
+test('op_overloading', qjs, args: ['--bignum', 'test_op_overloading.js'], workdir: test_root)
+test('bignum', qjs, args: ['--bignum', 'test_bignum.js'], workdir: test_root)
+test('qjscalc', qjs, args: ['--qjscalc', 'test_qjscalc.js'], workdir: test_root)
+
+benchmark('microbench', qjs, args: ['microbench.js'], workdir: test_root, timeout: 0)
\ No newline at end of file
diff --git a/qjs.c b/qjs.c
index 2eaa9ee..892eb92 100644
--- a/qjs.c
+++ b/qjs.c
@@ -512,7 +512,7 @@ int main(int argc, char **argv)
     if (dump_memory) {
         JSMemoryUsage stats;
         JS_ComputeMemoryUsage(rt, &stats);
-        JS_DumpMemoryUsage(stdout, &stats, rt);
+//        JS_DumpMemoryUsage(stdout, &stats, rt);
     }
     js_std_free_handlers(rt);
     JS_FreeContext(ctx);
diff --git a/quickjs-libc.c b/quickjs-libc.c
index 929caa0..d947bb8 100644
--- a/quickjs-libc.c
+++ b/quickjs-libc.c
@@ -736,7 +736,7 @@ static JSValue js_std_getenviron(JSContext *ctx, JSValueConst this_val,
 static JSValue js_std_gc(JSContext *ctx, JSValueConst this_val,
                          int argc, JSValueConst *argv)
 {
-    JS_RunGC(JS_GetRuntime(ctx), ctx);
+    JS_RunGC(JS_GetRuntime(ctx));
     return JS_UNDEFINED;
 }
 
diff --git a/quickjs.c b/quickjs.c
index 5c3dda8..a8e609c 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -7581,15 +7581,9 @@ static JSValue js_object_isPrototypeOf(JSContext *ctx, JSValueConst this_val, in
 /* return TRUE, FALSE or (-1) in case of exception */
 int JS_IsInstanceOf(JSContext *ctx, JSValueConst val, JSValueConst obj)
 {
-  JSValue ret = js_object_isPrototypeOf(ctx, obj, 1, &val);
-  int b = JS_ToBool(ctx,ret);
-  JS_FreeValue(ctx,ret);
-    return b;
-/*
     JSValue method;
     if (!JS_IsObject(obj))
         goto fail;
-    if (!JS_
     method = JS_GetProperty(ctx, obj, JS_ATOM_Symbol_hasInstance);
     if (JS_IsException(method))
         return -1;
@@ -7605,7 +7599,6 @@ int JS_IsInstanceOf(JSContext *ctx, JSValueConst val, JSValueConst obj)
         return -1;
     }
     return JS_OrdinaryIsInstanceOf(ctx, val, obj);
-*/
 }
 
 /* return the value associated to the autoinit property or an exception */