diff --git a/PORTING.md b/PORTING.md
index 4607b87..dd42faf 100644
--- a/PORTING.md
+++ b/PORTING.md
@@ -58,7 +58,7 @@ Tests covering the engine-specific part of Node-API, defined in `js_native_api.h
 | `test_exception`             | Ported ✅  | Medium     |
 | `test_finalizer`             | Ported ✅  | Medium     |
 | `test_function`              | Ported ✅  | Medium     |
-| `test_general`               | Not ported | Hard       |
+| `test_general`               | Partial    | Hard       |
 | `test_handle_scope`          | Ported ✅  | Easy       |
 | `test_instance_data`         | Not ported | Medium     |
 | `test_new_target`            | Ported ✅  | Easy       |
diff --git a/tests/js-native-api/test_general/CMakeLists.txt b/tests/js-native-api/test_general/CMakeLists.txt
new file mode 100644
index 0000000..1d36e70
--- /dev/null
+++ b/tests/js-native-api/test_general/CMakeLists.txt
@@ -0,0 +1 @@
+add_node_api_cts_addon(test_general test_general.c)
diff --git a/tests/js-native-api/test_general/test.js b/tests/js-native-api/test_general/test.js
new file mode 100644
index 0000000..54450d1
--- /dev/null
+++ b/tests/js-native-api/test_general/test.js
@@ -0,0 +1,96 @@
+const test_general = loadAddon('test_general');
+
+const val1 = '1';
+const val2 = 1;
+const val3 = 1;
+
+class BaseClass {
+}
+
+class ExtendedClass extends BaseClass {
+}
+
+const baseObject = new BaseClass();
+const extendedObject = new ExtendedClass();
+
+// napi_strict_equals
+assert.ok(test_general.testStrictEquals(val1, val1));
+assert.strictEqual(test_general.testStrictEquals(val1, val2), false);
+assert.ok(test_general.testStrictEquals(val2, val3));
+
+// napi_get_prototype
+assert.strictEqual(
+  test_general.testGetPrototype(baseObject),
+  Object.getPrototypeOf(baseObject),
+);
+assert.strictEqual(
+  test_general.testGetPrototype(extendedObject),
+  Object.getPrototypeOf(extendedObject),
+);
+// Prototypes for base and extended should be different.
+assert.notStrictEqual(
+  test_general.testGetPrototype(baseObject),
+  test_general.testGetPrototype(extendedObject),
+);
+
+// napi_get_version. Upstream pins this to Node.js's own Node-API version;
+// portably, the addon must report whatever version the runtime declares.
+assert.strictEqual(test_general.testGetVersion(), napiVersion);
+
+// napi_typeof
+[
+  123,
+  'test string',
+  function() {},
+  new Object(),
+  true,
+  undefined,
+  Symbol(),
+].forEach((val) => {
+  assert.strictEqual(test_general.testNapiTypeof(val), typeof val);
+});
+
+// typeof null is 'object' in JS, so napi_null gets its own case.
+assert.strictEqual(test_general.testNapiTypeof(null), 'null');
+
+// Wrapping the same object twice fails.
+const x = {};
+test_general.wrap(x);
+assert.throws(
+  () => test_general.wrap(x),
+  { name: 'Error', message: 'Invalid argument' },
+);
+// Clean up here, otherwise derefItemWasCalled() will be polluted.
+test_general.removeWrap(x);
+
+// Wrapping twice succeeds if a removeWrap() separates the instances.
+const y = {};
+test_general.wrap(y);
+test_general.removeWrap(y);
+test_general.wrap(y);
+// Clean up here, otherwise derefItemWasCalled() will be polluted.
+test_general.removeWrap(y);
+
+// napi_adjust_external_memory
+const adjustedValue = test_general.testAdjustExternalMemory();
+assert.strictEqual(typeof adjustedValue, 'number');
+assert.ok(adjustedValue > 0);
+
+// Garbage collecting a wrapped object calls the finalizer.
+assert.strictEqual(test_general.derefItemWasCalled(), false);
+
+(() => test_general.wrap({}))();
+await gcUntil(
+  'deref_item() was called upon garbage collecting a wrapped object.',
+  () => test_general.derefItemWasCalled(),
+);
+
+// Removing a wrap and then garbage collecting does not call the finalizer.
+let z = {};
+test_general.testFinalizeWrap(z);
+test_general.removeWrap(z);
+z = null;
+await gcUntil(
+  'finalize callback was not called upon garbage collection.',
+  () => !test_general.finalizeWasCalled(),
+);
diff --git a/tests/js-native-api/test_general/testGlobals.js b/tests/js-native-api/test_general/testGlobals.js
new file mode 100644
index 0000000..ad33b54
--- /dev/null
+++ b/tests/js-native-api/test_general/testGlobals.js
@@ -0,0 +1,4 @@
+const test_general = loadAddon('test_general');
+
+assert.strictEqual(test_general.getUndefined(), undefined);
+assert.strictEqual(test_general.getNull(), null);
diff --git a/tests/js-native-api/test_general/testInstanceOf.js b/tests/js-native-api/test_general/testInstanceOf.js
new file mode 100644
index 0000000..52f79b9
--- /dev/null
+++ b/tests/js-native-api/test_general/testInstanceOf.js
@@ -0,0 +1,41 @@
+const test_general = loadAddon('test_general');
+
+// napi_instanceof must agree with the `instanceof` operator, including when a
+// constructor overrides Symbol.hasInstance.
+function compareToNative(theObject, theConstructor) {
+  assert.strictEqual(
+    test_general.doInstanceOf(theObject, theConstructor),
+    theObject instanceof theConstructor,
+  );
+}
+
+function MyClass() {}
+Object.defineProperty(MyClass, Symbol.hasInstance, {
+  value: function(candidate) {
+    return 'mark' in candidate;
+  },
+});
+
+function MySubClass() {}
+MySubClass.prototype = new MyClass();
+
+// MySubClass inherits MyClass's Symbol.hasInstance, so both constructors
+// answer "does the candidate carry a mark?" rather than walking the prototype
+// chain -- which is exactly what makes y fail against its own constructor.
+let x = new MySubClass();
+let y = new MySubClass();
+x.mark = true;
+
+compareToNative(x, MySubClass);
+compareToNative(y, MySubClass);
+compareToNative(x, MyClass);
+compareToNative(y, MyClass);
+
+x = new MyClass();
+y = new MyClass();
+x.mark = true;
+
+compareToNative(x, MySubClass);
+compareToNative(y, MySubClass);
+compareToNative(x, MyClass);
+compareToNative(y, MyClass);
diff --git a/tests/js-native-api/test_general/testNapiRun.js b/tests/js-native-api/test_general/testNapiRun.js
new file mode 100644
index 0000000..d11ed81
--- /dev/null
+++ b/tests/js-native-api/test_general/testNapiRun.js
@@ -0,0 +1,7 @@
+const test_general = loadAddon('test_general');
+
+assert.strictEqual(test_general.testNapiRun('(41.92 + 0.08);'), 42);
+assert.throws(
+  () => test_general.testNapiRun({ abc: 'def' }),
+  /string was expected/,
+);
diff --git a/tests/js-native-api/test_general/testNapiStatus.js b/tests/js-native-api/test_general/testNapiStatus.js
new file mode 100644
index 0000000..1a1cdf3
--- /dev/null
+++ b/tests/js-native-api/test_general/testNapiStatus.js
@@ -0,0 +1,10 @@
+const test_general = loadAddon('test_general');
+
+// createNapiError provokes a failing call, then checks that
+// napi_get_last_error_info reports that failure. The next successful call must
+// reset the recorded status back to napi_ok.
+test_general.createNapiError();
+assert.ok(
+  test_general.testNapiErrorCleanup(),
+  'napi_status cleaned up for second call',
+);
diff --git a/tests/js-native-api/test_general/testV8Instanceof.js b/tests/js-native-api/test_general/testV8Instanceof.js
new file mode 100644
index 0000000..6d274b0
--- /dev/null
+++ b/tests/js-native-api/test_general/testV8Instanceof.js
@@ -0,0 +1,99 @@
+// This test is adopted from V8's test suite.
+// See deps/v8/test/mjsunit/instanceof.js in Node.js source repository.
+//
+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * 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.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// 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.
+
+const addon = loadAddon('test_general');
+
+assert.ok(addon.doInstanceOf({}, Object));
+assert.ok(addon.doInstanceOf([], Object));
+
+assert.ok(!addon.doInstanceOf({}, Array));
+assert.ok(addon.doInstanceOf([], Array));
+
+function TestChains() {
+  const A = {};
+  const B = {};
+  const C = {};
+  Object.setPrototypeOf(B, A);
+  Object.setPrototypeOf(C, B);
+
+  function F() { }
+  F.prototype = A;
+  assert.ok(addon.doInstanceOf(C, F));
+  assert.ok(addon.doInstanceOf(B, F));
+  assert.ok(!addon.doInstanceOf(A, F));
+
+  F.prototype = B;
+  assert.ok(addon.doInstanceOf(C, F));
+  assert.ok(!addon.doInstanceOf(B, F));
+  assert.ok(!addon.doInstanceOf(A, F));
+
+  F.prototype = C;
+  assert.ok(!addon.doInstanceOf(C, F));
+  assert.ok(!addon.doInstanceOf(B, F));
+  assert.ok(!addon.doInstanceOf(A, F));
+}
+
+TestChains();
+
+function TestExceptions() {
+  function F() { }
+  const items = [ 1, new Number(42),
+                  true,
+                  'string', new String('hest'),
+                  {}, [],
+                  F, new F(),
+                  Object, String ];
+
+  let exceptions = 0;
+  let instanceofs = 0;
+
+  for (let i = 0; i < items.length; i++) {
+    for (let j = 0; j < items.length; j++) {
+      try {
+        if (addon.doInstanceOf(items[i], items[j])) instanceofs++;
+      } catch (e) {
+        assert.ok(addon.doInstanceOf(e, TypeError));
+        exceptions++;
+      }
+    }
+  }
+  assert.strictEqual(instanceofs, 10);
+  assert.strictEqual(exceptions, 88);
+
+  // Make sure to throw an exception if the function prototype
+  // isn't a proper JavaScript object.
+  function G() { }
+  G.prototype = undefined;
+  assert.throws(function() {
+    addon.doInstanceOf({}, G);
+  }, Error);
+}
+
+TestExceptions();
diff --git a/tests/js-native-api/test_general/testV8Instanceof2.js b/tests/js-native-api/test_general/testV8Instanceof2.js
new file mode 100644
index 0000000..9a49531
--- /dev/null
+++ b/tests/js-native-api/test_general/testV8Instanceof2.js
@@ -0,0 +1,335 @@
+// This test is adopted from V8's test suite.
+// See deps/v8/test/mjsunit/instanceof-2.js in Node.js source repository.
+//
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * 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.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// 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.
+
+const addon = loadAddon('test_general');
+
+const except = 'exception';
+
+let correct_answer_index = 0;
+const correct_answers = [
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, true, false, false, true,
+  false, true, true, false, false, true, true, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, false, true,
+  except, except, true, false, except, except, true, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, true, false, except, except,
+  false, true, except, except, false, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, false, false, true, true,
+  false, true, true, false, false, true, true, false,
+  true, true, false, false, false, true, true, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, true, false,
+  except, except, false, false, except, except, true, false,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, true, false, except, except,
+  false, true, except, except, false, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, true, true, false,
+  true, false, false, true, true, true, false, false,
+  false, true, true, false, false, true, true, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, false, true,
+  except, except, true, false, except, except, true, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, false, true, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, false, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, true, true, false,
+  true, false, false, true, false, true, true, false,
+  false, true, true, false, false, true, true, false,
+  true, true, false, false, false, true, true, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, true, false,
+  except, except, false, false, except, except, true, false,
+  false, false, except, except, false, true, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, false, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, false, false, true, true,
+  false, true, true, false, true, true, false, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, false, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, false, false, except, except,
+  false, true, except, except, true, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, false, false, true, true,
+  false, true, true, false, true, true, false, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, false, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, false, false, except, except,
+  false, true, except, except, true, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, true, true, false, false,
+  true, false, false, true, true, true, false, false,
+  false, true, true, false, true, true, false, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, false, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, true, true, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, true, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, true, true, false, false,
+  true, false, false, true, true, true, false, false,
+  false, true, true, false, true, true, false, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, false, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, true, true, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, true, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, true, true, false, false,
+  false, true, true, false, false, false, true, true,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, false, false,
+  except, except, true, false, except, except, true, true,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, false, false, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, false, false, true, true,
+  false, true, true, false, false, false, true, true,
+  true, true, false, false, false, false, true, true,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, true, true,
+  except, except, false, false, except, except, true, true,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, false, false, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, true, true, false, false,
+  false, true, true, false, false, false, true, true,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, false, false,
+  except, except, true, false, except, except, true, true,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, false, false, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, false, false, true, true,
+  false, true, true, false, false, false, true, true,
+  true, true, false, false, false, false, true, true,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, true, true,
+  except, except, false, false, except, except, true, true,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, false, false, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, false, false, true, true,
+  false, true, true, false, true, true, false, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, false, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, false, false, except, except,
+  false, true, except, except, true, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, false, false, true, true,
+  true, false, false, true, false, false, true, true,
+  false, true, true, false, true, true, false, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, false, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, false, false, except, except,
+  true, false, except, except, false, false, except, except,
+  false, true, except, except, true, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, true, true, false, false,
+  true, false, false, true, true, true, false, false,
+  false, true, true, false, true, true, false, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, false, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, true, true, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, true, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  false, false, true, true, true, true, false, false,
+  true, false, false, true, true, true, false, false,
+  false, true, true, false, true, true, false, false,
+  true, true, false, false, true, true, false, false,
+  except, except, true, true, except, except, true, true,
+  except, except, false, true, except, except, true, true,
+  except, except, true, false, except, except, false, false,
+  except, except, false, false, except, except, false, false,
+  false, false, except, except, true, true, except, except,
+  true, false, except, except, true, true, except, except,
+  false, true, except, except, true, true, except, except,
+  true, true, except, except, true, true, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except,
+  except, except, except, except, except, except, except, except];
+
+for (let i = 0; i < 256; i++) {
+  Test(i & 1, i & 2, i & 4, i & 8, i & 0x10, i & 0x20, i & 0x40, i & 0x80);
+}
+
+
+function InstanceTest(x, func) {
+  try {
+    const answer = addon.doInstanceOf(x, func);
+    assert.strictEqual(correct_answers[correct_answer_index], answer);
+  } catch (e) {
+    assert.match(`${e}`, /prototype/);
+    assert.strictEqual(correct_answers[correct_answer_index], except);
+  }
+  correct_answer_index++;
+}
+
+
+function Test(a, b, c, d, e, f, g, h) {
+  function Foo() { }
+
+  function Bar() { }
+
+  if (c) Foo.prototype = 12;
+  if (d) Bar.prototype = 13;
+  const x = a ? new Foo() : new Bar();
+  const y = b ? new Foo() : new Bar();
+  InstanceTest(x, Foo);
+  InstanceTest(y, Foo);
+  InstanceTest(x, Bar);
+  InstanceTest(y, Bar);
+  if (e) x.__proto__ = Bar.prototype;
+  if (f) y.__proto__ = Foo.prototype;
+  if (g) {
+    Object.setPrototypeOf(x, y);
+  } else if (h) {
+    Object.setPrototypeOf(y, x);
+  }
+  InstanceTest(x, Foo);
+  InstanceTest(y, Foo);
+  InstanceTest(x, Bar);
+  InstanceTest(y, Bar);
+}
diff --git a/tests/js-native-api/test_general/test_general.c b/tests/js-native-api/test_general/test_general.c
new file mode 100644
index 0000000..a08512f
--- /dev/null
+++ b/tests/js-native-api/test_general/test_general.c
@@ -0,0 +1,244 @@
+#include <js_native_api.h>
+#include <stdint.h>
+#include "../common.h"
+#include "../entry_point.h"
+
+static napi_value testStrictEquals(napi_env env, napi_callback_info info) {
+  size_t argc = 2;
+  napi_value args[2];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  bool bool_result;
+  napi_value result;
+  NODE_API_CALL(env, napi_strict_equals(env, args[0], args[1], &bool_result));
+  NODE_API_CALL(env, napi_get_boolean(env, bool_result, &result));
+
+  return result;
+}
+
+static napi_value testGetPrototype(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  napi_value result;
+  NODE_API_CALL(env, napi_get_prototype(env, args[0], &result));
+
+  return result;
+}
+
+static napi_value testGetVersion(napi_env env, napi_callback_info info) {
+  uint32_t version;
+  napi_value result;
+  NODE_API_CALL(env, napi_get_version(env, &version));
+  NODE_API_CALL(env, napi_create_uint32(env, version, &result));
+  return result;
+}
+
+static napi_value doInstanceOf(napi_env env, napi_callback_info info) {
+  size_t argc = 2;
+  napi_value args[2];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  bool is_instance;
+  NODE_API_CALL(env, napi_instanceof(env, args[0], args[1], &is_instance));
+
+  napi_value result;
+  NODE_API_CALL(env, napi_get_boolean(env, is_instance, &result));
+
+  return result;
+}
+
+static napi_value getNull(napi_env env, napi_callback_info info) {
+  napi_value result;
+  NODE_API_CALL(env, napi_get_null(env, &result));
+  return result;
+}
+
+static napi_value getUndefined(napi_env env, napi_callback_info info) {
+  napi_value result;
+  NODE_API_CALL(env, napi_get_undefined(env, &result));
+  return result;
+}
+
+static napi_value createNapiError(napi_env env, napi_callback_info info) {
+  napi_value value;
+  NODE_API_CALL(env, napi_create_string_utf8(env, "xyz", 3, &value));
+
+  double double_value;
+  napi_status status = napi_get_value_double(env, value, &double_value);
+
+  NODE_API_ASSERT(env, status != napi_ok, "Failed to produce error condition");
+
+  const napi_extended_error_info* error_info = 0;
+  NODE_API_CALL(env, napi_get_last_error_info(env, &error_info));
+
+  NODE_API_ASSERT(env,
+                  error_info->error_code == status,
+                  "Last error info code should match last status");
+  NODE_API_ASSERT(env,
+                  error_info->error_message,
+                  "Last error info message should not be null");
+
+  return NULL;
+}
+
+static napi_value testNapiErrorCleanup(napi_env env, napi_callback_info info) {
+  const napi_extended_error_info* error_info = 0;
+  NODE_API_CALL(env, napi_get_last_error_info(env, &error_info));
+
+  napi_value result;
+  bool is_ok = error_info->error_code == napi_ok;
+  NODE_API_CALL(env, napi_get_boolean(env, is_ok, &result));
+
+  return result;
+}
+
+static napi_value testNapiTypeof(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  napi_valuetype argument_type;
+  NODE_API_CALL(env, napi_typeof(env, args[0], &argument_type));
+
+  const char* name = NULL;
+  switch (argument_type) {
+    case napi_number: name = "number"; break;
+    case napi_string: name = "string"; break;
+    case napi_function: name = "function"; break;
+    case napi_object: name = "object"; break;
+    case napi_boolean: name = "boolean"; break;
+    case napi_undefined: name = "undefined"; break;
+    case napi_symbol: name = "symbol"; break;
+    case napi_null: name = "null"; break;
+    default: return NULL;
+  }
+
+  napi_value result;
+  NODE_API_CALL(
+      env, napi_create_string_utf8(env, name, NAPI_AUTO_LENGTH, &result));
+  return result;
+}
+
+static bool deref_item_called = false;
+
+static void deref_item(node_api_basic_env env, void* data, void* hint) {
+  (void)hint;
+
+  NODE_API_BASIC_ASSERT_RETURN_VOID(
+      data == &deref_item_called,
+      "Finalize callback was called with the correct pointer");
+
+  deref_item_called = true;
+}
+
+static napi_value deref_item_was_called(napi_env env, napi_callback_info info) {
+  napi_value it_was_called;
+
+  NODE_API_CALL(env, napi_get_boolean(env, deref_item_called, &it_was_called));
+
+  return it_was_called;
+}
+
+static napi_value wrap_first_arg(napi_env env,
+                                 napi_callback_info info,
+                                 node_api_basic_finalize finalizer,
+                                 void* data) {
+  size_t argc = 1;
+  napi_value to_wrap;
+
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, &to_wrap, NULL, NULL));
+  NODE_API_CALL(env, napi_wrap(env, to_wrap, data, finalizer, NULL, NULL));
+
+  return to_wrap;
+}
+
+static napi_value wrap(napi_env env, napi_callback_info info) {
+  deref_item_called = false;
+  return wrap_first_arg(env, info, deref_item, &deref_item_called);
+}
+
+static napi_value remove_wrap(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value wrapped;
+  void* data;
+
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, &wrapped, NULL, NULL));
+  NODE_API_CALL(env, napi_remove_wrap(env, wrapped, &data));
+
+  return NULL;
+}
+
+static bool finalize_called = false;
+
+static void test_finalize(node_api_basic_env env, void* data, void* hint) {
+  (void)env;
+  (void)data;
+  (void)hint;
+
+  finalize_called = true;
+}
+
+static napi_value test_finalize_wrap(napi_env env, napi_callback_info info) {
+  return wrap_first_arg(env, info, test_finalize, NULL);
+}
+
+static napi_value finalize_was_called(napi_env env, napi_callback_info info) {
+  napi_value it_was_called;
+
+  NODE_API_CALL(env, napi_get_boolean(env, finalize_called, &it_was_called));
+
+  return it_was_called;
+}
+
+static napi_value testAdjustExternalMemory(napi_env env,
+                                           napi_callback_info info) {
+  napi_value result;
+  int64_t adjustedValue;
+
+  NODE_API_CALL(env, napi_adjust_external_memory(env, 1, &adjustedValue));
+  NODE_API_CALL(env, napi_create_double(env, (double)adjustedValue, &result));
+
+  return result;
+}
+
+static napi_value testNapiRun(napi_env env, napi_callback_info info) {
+  napi_value script, result;
+  size_t argc = 1;
+
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, &script, NULL, NULL));
+  NODE_API_CALL(env, napi_run_script(env, script, &result));
+
+  return result;
+}
+
+EXTERN_C_START
+napi_value Init(napi_env env, napi_value exports) {
+  napi_property_descriptor descriptors[] = {
+      DECLARE_NODE_API_PROPERTY("testStrictEquals", testStrictEquals),
+      DECLARE_NODE_API_PROPERTY("testGetPrototype", testGetPrototype),
+      DECLARE_NODE_API_PROPERTY("testGetVersion", testGetVersion),
+      DECLARE_NODE_API_PROPERTY("testNapiRun", testNapiRun),
+      DECLARE_NODE_API_PROPERTY("doInstanceOf", doInstanceOf),
+      DECLARE_NODE_API_PROPERTY("getUndefined", getUndefined),
+      DECLARE_NODE_API_PROPERTY("getNull", getNull),
+      DECLARE_NODE_API_PROPERTY("createNapiError", createNapiError),
+      DECLARE_NODE_API_PROPERTY("testNapiErrorCleanup", testNapiErrorCleanup),
+      DECLARE_NODE_API_PROPERTY("testNapiTypeof", testNapiTypeof),
+      DECLARE_NODE_API_PROPERTY("wrap", wrap),
+      DECLARE_NODE_API_PROPERTY("removeWrap", remove_wrap),
+      DECLARE_NODE_API_PROPERTY("testFinalizeWrap", test_finalize_wrap),
+      DECLARE_NODE_API_PROPERTY("finalizeWasCalled", finalize_was_called),
+      DECLARE_NODE_API_PROPERTY("derefItemWasCalled", deref_item_was_called),
+      DECLARE_NODE_API_PROPERTY("testAdjustExternalMemory",
+                                testAdjustExternalMemory)};
+
+  NODE_API_CALL(
+      env,
+      napi_define_properties(
+          env, exports, sizeof(descriptors) / sizeof(*descriptors), descriptors));
+
+  return exports;
+}
+EXTERN_C_END