diff --git a/html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java b/html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java
index 5e0d12448..7ebd10684 100644
--- a/html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java
+++ b/html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java
@@ -47,6 +47,7 @@ import org.testng.Assert;
 public final class KnockoutFXTest extends KnockoutTCK implements Transfer, WSTransfer<WSImpl> {
     private static Class<?> browserClass;
     private static Fn.Presenter browserContext;
+
     private KO4J ko4j = new KO4J();
     private final Map<String, Request> urlMap = new HashMap<>();
     private final Map<String, WSImpl> wsUrlMap = new HashMap<>();
@@ -54,6 +55,10 @@ public final class KnockoutFXTest extends KnockoutTCK implements Transfer, WSTra
     public KnockoutFXTest() {
     }
 
+    static Class<?>[] allTestClasses() {
+        return testClasses();
+    }
+
     static ClassLoader getClassLoader() throws InterruptedException {
         while (browserClass == null) {
             KnockoutFXTest.class.wait();
diff --git a/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKCheckTest.java b/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKCheckTest.java
new file mode 100644
index 000000000..b5118863d
--- /dev/null
+++ b/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKCheckTest.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2017 Jaroslav Tulach.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.teavm.html4j.test;
+
+import java.lang.reflect.Method;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.fail;
+import org.junit.Test;
+import org.netbeans.html.json.tck.KOTest;
+
+/**
+ *
+ * @author Jaroslav Tulach
+ */
+public class KnockoutTCKCheckTest {
+    @Test
+    public void allKnockoutTestMethodsOverriden() throws Exception {
+        for (Class<?> c : KnockoutFXTest.allTestClasses()) {
+            if (c.getName().contains("GC")) {
+                continue;
+            }
+            for (Method m : c.getMethods()) {
+                if (m.getAnnotation(KOTest.class) != null) {
+                    Method override = null;
+                    try {
+                        override = KnockoutTCKTest.class.getMethod(m.getName());
+                    } catch (NoSuchMethodException ex) {
+                        fail("Cannot find " + m);
+                    }
+                    assertEquals("overriden: " + override, KnockoutTCKTest.class, override.getDeclaringClass());
+                    assertNotNull("annotated: " + override, override.getAnnotation(Test.class));
+                }
+            }
+        }
+    }
+}
diff --git a/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKTest.java b/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKTest.java
new file mode 100644
index 000000000..0156bcc69
--- /dev/null
+++ b/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKTest.java
@@ -0,0 +1,399 @@
+/*
+ * Copyright 2017 Jaroslav Tulach.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.teavm.html4j.test;
+
+import net.java.html.json.tests.ConvertTypesTest;
+import net.java.html.json.tests.JSONTest;
+import net.java.html.json.tests.KnockoutTest;
+import net.java.html.json.tests.MinesTest;
+import net.java.html.json.tests.OperationsTest;
+import net.java.html.json.tests.WebSocketTest;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.teavm.junit.SkipJVM;
+import org.teavm.junit.TeaVMTestRunner;
+
+/**
+ *
+ * @author Jaroslav Tulach
+ */
+@RunWith(TeaVMTestRunner.class)
+@SkipJVM
+public class KnockoutTCKTest {
+    private final ConvertTypesTest convertTypesTest = new ConvertTypesTest();
+    private final JSONTest jsonTest = new JSONTest();
+    private final KnockoutTest knockoutTest = new KnockoutTest();
+    private final MinesTest minesTest = new MinesTest();
+    private final OperationsTest operationsTest = new OperationsTest();
+    private final WebSocketTest webSocketTest = new WebSocketTest();
+
+    @Test
+    public void connectUsingWebSocket() throws Throwable {
+        webSocketTest.connectUsingWebSocket();
+    }
+
+    @Test
+    public void errorUsingWebSocket() throws Throwable {
+        webSocketTest.errorUsingWebSocket();
+    }
+
+    @Test
+    public void haveToOpenTheWebSocket() throws Throwable {
+        webSocketTest.haveToOpenTheWebSocket();
+    }
+
+    @Test
+    public void syncOperation() {
+        operationsTest.syncOperation();
+    }
+
+    @Test
+    public void asyncOperation() throws InterruptedException {
+        operationsTest.asyncOperation();
+    }
+
+    @Test
+    public void paintTheGridOnClick() throws Throwable {
+        minesTest.paintTheGridOnClick();
+    }
+
+    @Test
+    public void countAround() throws Exception {
+        minesTest.countAround();
+    }
+
+    @Test
+    public void modifyValueAssertChangeInModelOnEnum() throws Throwable {
+        knockoutTest.modifyValueAssertChangeInModelOnEnum();
+    }
+
+    @Test
+    public void modifyRadioValueOnEnum() throws Throwable {
+        knockoutTest.modifyRadioValueOnEnum();
+    }
+
+    @Test
+    public void modifyValueAssertChangeInModelOnDouble() throws Throwable {
+        knockoutTest.modifyValueAssertChangeInModelOnDouble();
+    }
+
+    @Test
+    public void rawObject() throws Exception {
+        knockoutTest.rawObject();
+    }
+
+    @Test
+    public void modifyComputedProperty() throws Throwable {
+        knockoutTest.modifyComputedProperty();
+    }
+
+    @Test
+    public void modifyValueAssertChangeInModelOnBoolean() throws Throwable {
+        knockoutTest.modifyValueAssertChangeInModelOnBoolean();
+    }
+
+    @Test
+    public void modifyValueAssertChangeInModel() throws Exception {
+        knockoutTest.modifyValueAssertChangeInModel();
+    }
+
+    @Test
+    public void selectWorksOnModels() throws Exception {
+        knockoutTest.selectWorksOnModels();
+    }
+
+    @Test
+    public void nestedObjectEqualsChange() throws Exception {
+        knockoutTest.nestedObjectEqualsChange();
+    }
+
+    @Test
+    public void nestedObjectChange() throws Exception {
+        knockoutTest.nestedObjectChange();
+    }
+
+    @Test
+    public void modifyValueAssertAsyncChangeInModel() throws Exception {
+        knockoutTest.modifyValueAssertAsyncChangeInModel();
+    }
+
+    @Test
+    public void nonMutableDouble() throws Exception {
+        knockoutTest.nonMutableDouble();
+    }
+
+    @Test
+    public void nonMutableString() throws Exception {
+        knockoutTest.nonMutableString();
+    }
+
+    @Test
+    public void nonMutableBoolean() throws Exception {
+        knockoutTest.nonMutableBoolean();
+    }
+
+    @Test
+    public void nonMutableIntArray() throws Exception {
+        knockoutTest.nonMutableIntArray();
+    }
+
+    @Test
+    public static void triggerEvent(String id, String ev) throws Exception {
+        KnockoutTest.triggerEvent(id, ev);
+    }
+
+    @Test
+    public void displayContentOfArray() throws Exception {
+        knockoutTest.displayContentOfArray();
+    }
+
+    @Test
+    public void displayContentOfAsyncArray() throws Exception {
+        knockoutTest.displayContentOfAsyncArray();
+    }
+
+    @Test
+    public void displayContentOfComputedArray() throws Exception {
+        knockoutTest.displayContentOfComputedArray();
+    }
+
+    @Test
+    public void displayContentOfComputedArrayOnASubpair() throws Exception {
+        knockoutTest.displayContentOfComputedArrayOnASubpair();
+    }
+
+    @Test
+    public void displayContentOfComputedArrayOnComputedASubpair() throws Exception {
+        knockoutTest.displayContentOfComputedArrayOnComputedASubpair();
+    }
+
+    @Test
+    public void checkBoxToBooleanBinding() throws Exception {
+        knockoutTest.checkBoxToBooleanBinding();
+    }
+
+    @Test
+    public void displayContentOfDerivedArray() throws Exception {
+        knockoutTest.displayContentOfDerivedArray();
+    }
+
+    @Test
+    public void displayContentOfArrayOfPeople() throws Exception {
+        knockoutTest.displayContentOfArrayOfPeople();
+    }
+
+    @Test
+    public void accessFirstPersonWithOnFunction() throws Exception {
+        knockoutTest.accessFirstPersonWithOnFunction();
+    }
+
+    @Test
+    public void onPersonFunction() throws Exception {
+        knockoutTest.onPersonFunction();
+    }
+
+    @Test
+    public void stringArrayModificationVisible() throws Exception {
+        knockoutTest.stringArrayModificationVisible();
+    }
+
+    @Test
+    public void intArrayModificationVisible() throws Exception {
+        knockoutTest.intArrayModificationVisible();
+    }
+
+    @Test
+    public void derivedIntArrayModificationVisible() throws Exception {
+        knockoutTest.derivedIntArrayModificationVisible();
+    }
+
+    @Test
+    public void archetypeArrayModificationVisible() throws Exception {
+        knockoutTest.archetypeArrayModificationVisible();
+    }
+
+    @Test
+    public void toJSONInABrowser() throws Throwable {
+        jsonTest.toJSONInABrowser();
+    }
+
+    @Test
+    public void toJSONWithEscapeCharactersInABrowser() throws Throwable {
+        jsonTest.toJSONWithEscapeCharactersInABrowser();
+    }
+
+    @Test
+    public void toJSONWithDoubleSlashInABrowser() throws Throwable {
+        jsonTest.toJSONWithDoubleSlashInABrowser();
+    }
+
+    @Test
+    public void toJSONWithApostrophInABrowser() throws Throwable {
+        jsonTest.toJSONWithApostrophInABrowser();
+    }
+
+    @Test
+    public void loadAndParseJSON() throws InterruptedException {
+        jsonTest.loadAndParseJSON();
+    }
+
+    @Test
+    public void loadAndParsePlainText() throws Exception {
+        jsonTest.loadAndParsePlainText();
+    }
+
+    @Test
+    public void loadAndParsePlainTextOnArray() throws Exception {
+        jsonTest.loadAndParsePlainTextOnArray();
+    }
+
+    @Test
+    public void loadAndParseJSONP() throws InterruptedException, Exception {
+        jsonTest.loadAndParseJSONP();
+    }
+
+    @Test
+    public void putPeopleUsesRightMethod() throws InterruptedException, Exception {
+        jsonTest.putPeopleUsesRightMethod();
+    }
+
+    @Test
+    public void loadAndParseJSONSentToArray() throws InterruptedException {
+        jsonTest.loadAndParseJSONSentToArray();
+    }
+
+    @Test
+    public void loadAndParseJSONArraySingle() throws InterruptedException {
+        jsonTest.loadAndParseJSONArraySingle();
+    }
+
+    @Test
+    public void loadAndParseArrayInPeople() throws InterruptedException {
+        jsonTest.loadAndParseArrayInPeople();
+    }
+
+    @Test
+    public void loadAndParseArrayInPeopleWithHeaders() throws InterruptedException {
+        jsonTest.loadAndParseArrayInPeopleWithHeaders();
+    }
+
+    @Test
+    public void loadAndParseArrayOfIntegers() throws InterruptedException {
+        jsonTest.loadAndParseArrayOfIntegers();
+    }
+
+    @Test
+    public void loadAndParseArrayOfEnums() throws InterruptedException {
+        jsonTest.loadAndParseArrayOfEnums();
+    }
+
+    @Test
+    public void loadAndParseJSONArray() throws InterruptedException {
+        jsonTest.loadAndParseJSONArray();
+    }
+
+    @Test
+    public void loadError() throws InterruptedException {
+        jsonTest.loadError();
+    }
+
+    @Test
+    public void parseNullNumber() throws Exception {
+        jsonTest.parseNullNumber();
+    }
+
+    @Test
+    public void deserializeWrongEnum() throws Exception {
+        jsonTest.deserializeWrongEnum();
+    }
+
+    @Test
+    public void testConvertToPeople() throws Exception {
+        convertTypesTest.testConvertToPeople();
+    }
+
+    @Test
+    public void parseConvertToPeople() throws Exception {
+        convertTypesTest.parseConvertToPeople();
+    }
+
+    @Test
+    public void parseConvertToPeopleWithAddress() throws Exception {
+        convertTypesTest.parseConvertToPeopleWithAddress();
+    }
+
+    @Test
+    public void parseConvertToPeopleWithAddressIntoAnArray() throws Exception {
+        convertTypesTest.parseConvertToPeopleWithAddressIntoAnArray();
+    }
+
+    @Test
+    public void parseNullValue() throws Exception {
+        convertTypesTest.parseNullValue();
+    }
+
+    @Test
+    public void parseNullArrayValue() throws Exception {
+        convertTypesTest.parseNullArrayValue();
+    }
+
+    @Test
+    public void testConvertToPeopleWithoutSex() throws Exception {
+        convertTypesTest.testConvertToPeopleWithoutSex();
+    }
+
+    @Test
+    public void parseConvertToPeopleWithoutSex() throws Exception {
+        convertTypesTest.parseConvertToPeopleWithoutSex();
+    }
+
+    @Test
+    public void parseConvertToPeopleWithAddressOnArray() throws Exception {
+        convertTypesTest.parseConvertToPeopleWithAddressOnArray();
+    }
+
+    @Test
+    public void parseConvertToPeopleWithoutSexOnArray() throws Exception {
+        convertTypesTest.parseConvertToPeopleWithoutSexOnArray();
+    }
+
+    @Test
+    public void parseFirstElementFromAbiggerArray() throws Exception {
+        convertTypesTest.parseFirstElementFromAbiggerArray();
+    }
+
+    @Test
+    public void parseAllElementFromAbiggerArray() throws Exception {
+        convertTypesTest.parseAllElementFromAbiggerArray();
+    }
+
+    @Test
+    public void parseFiveElementsAsAnArray() throws Exception {
+        convertTypesTest.parseFiveElementsAsAnArray();
+    }
+
+    @Test
+    public void parseInnerElementAsAnArray() throws Exception {
+        convertTypesTest.parseInnerElementAsAnArray();
+    }
+
+
+    @Test
+    public void parseOnEmptyArray() throws Exception {
+        convertTypesTest.parseOnEmptyArray();
+    }
+
+}