diff --git a/html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyConversionTest.java b/html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyConversionTest.java
index 4c9785906..337bee801 100644
--- a/html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyConversionTest.java
+++ b/html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyConversionTest.java
@@ -17,7 +17,6 @@ package org.teavm.html4j.test;
 
 import static org.junit.Assert.*;
 import net.java.html.js.JavaScriptBody;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.teavm.junit.SkipJVM;
@@ -25,7 +24,6 @@ import org.teavm.junit.TeaVMTestRunner;
 
 @RunWith(TeaVMTestRunner.class)
 @SkipJVM
-@Ignore
 public class JavaScriptBodyConversionTest {
     @Test
     public void convertsInteger() {
@@ -60,9 +58,9 @@ public class JavaScriptBodyConversionTest {
     @Test
     public void copiesArray() {
         Integer[] array = { 23, 42 };
-        Integer[] arrayCopy = (Integer[]) modifyIntegerArray(array);
+        Object[] arrayCopy = (Object[]) modifyIntegerArray(array);
         assertEquals(Integer.valueOf(23), array[0]);
-        assertEquals(Integer.valueOf(1), arrayCopy[0]);
+        assertEquals(1, arrayCopy[0]);
     }
 
     @Test
diff --git a/html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyTest.java b/html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyTest.java
index d00ea90d7..b1f4683ac 100644
--- a/html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyTest.java
+++ b/html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyTest.java
@@ -17,12 +17,12 @@ package org.teavm.html4j.test;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import net.java.html.js.JavaScriptBody;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.teavm.junit.SkipJVM;
@@ -30,7 +30,6 @@ import org.teavm.junit.TeaVMTestRunner;
 
 @RunWith(TeaVMTestRunner.class)
 @SkipJVM
-@Ignore
 public class JavaScriptBodyTest {
     @Test
     public void readResource() throws IOException {
@@ -63,8 +62,9 @@ public class JavaScriptBodyTest {
     @Test
     public void dependencyPropagatedThroughArray() {
         storeObject(new Object[] { new AImpl() });
-        A[] array = (A[]) retrieveObject();
-        assertEquals(23, array[0].foo());
+        Object[] array = (Object[]) retrieveObject();
+        assertTrue(array[0] instanceof A);
+        assertEquals(23, ((A) array[0]).foo());
     }
 
     @Test
diff --git a/html4j/src/test/java/org/teavm/html4j/test/JavaScriptTCKCheckTest.java b/html4j/src/test/java/org/teavm/html4j/test/JavaScriptTCKCheckTest.java
index a57c154d5..cbf6032ce 100644
--- a/html4j/src/test/java/org/teavm/html4j/test/JavaScriptTCKCheckTest.java
+++ b/html4j/src/test/java/org/teavm/html4j/test/JavaScriptTCKCheckTest.java
@@ -18,19 +18,22 @@ package org.teavm.html4j.test;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import java.lang.reflect.Method;
-import org.junit.Ignore;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.netbeans.html.json.tck.JavaScriptTCK;
 import org.netbeans.html.json.tck.KOTest;
+import org.teavm.junit.SkipJVM;
+import org.teavm.junit.TeaVMTestRunner;
 
 /**
  *
  * @author Jaroslav Tulach
  */
-@Ignore
+@RunWith(TeaVMTestRunner.class)
+@SkipJVM
 public class JavaScriptTCKCheckTest extends JavaScriptTCK {
     @Test
-    public void allJavaScriptBodyTestMethodsOverriden() throws Exception {
+    public void allJavaScriptBodyTestMethodsOverridden() throws Exception {
         for (Class<?> c : testClasses()) {
             if (c.getName().contains("GC")) {
                 continue;
diff --git a/html4j/src/test/java/org/teavm/html4j/test/JavaScriptTCKTest.java b/html4j/src/test/java/org/teavm/html4j/test/JavaScriptTCKTest.java
index 95dbda02a..67684b94f 100644
--- a/html4j/src/test/java/org/teavm/html4j/test/JavaScriptTCKTest.java
+++ b/html4j/src/test/java/org/teavm/html4j/test/JavaScriptTCKTest.java
@@ -16,7 +16,6 @@
 package org.teavm.html4j.test;
 
 import net.java.html.js.tests.JavaScriptBodyTest;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.teavm.junit.SkipJVM;
@@ -28,7 +27,6 @@ import org.teavm.junit.TeaVMTestRunner;
  */
 @RunWith(TeaVMTestRunner.class)
 @SkipJVM
-@Ignore
 public class JavaScriptTCKTest extends JavaScriptBodyTest {
 
     @Test @Override
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 d3f8f83d4..8e86d4224 100644
--- a/html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java
+++ b/html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java
@@ -24,7 +24,6 @@ import java.util.HashMap;
 import java.util.Map;
 import net.java.html.BrwsrCtx;
 import net.java.html.js.JavaScriptBody;
-import org.junit.Ignore;
 import org.netbeans.html.context.spi.Contexts;
 import org.netbeans.html.json.spi.JSONCall;
 import org.netbeans.html.json.spi.Technology;
@@ -38,14 +37,11 @@ import org.teavm.jso.JSObject;
 import org.teavm.jso.browser.Window;
 import org.teavm.jso.dom.html.HTMLDocument;
 import org.teavm.jso.dom.html.HTMLElement;
-import org.teavm.junit.WholeClassCompilation;
 
 /**
  *
  * @author Jaroslav Tulach <jtulach@netbeans.org>
  */
-@WholeClassCompilation
-@Ignore
 public final class KnockoutFXTest extends KnockoutTCK implements Transfer, WSTransfer<WSImpl> {
     private KO4J ko4j = new KO4J();
     private final Map<String, Request> urlMap = new HashMap<>();
diff --git a/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKCheckTest.java b/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKCheckTest.java
index 53fde41ef..088a9de0c 100644
--- a/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKCheckTest.java
+++ b/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKCheckTest.java
@@ -19,18 +19,21 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.fail;
 import java.lang.reflect.Method;
-import org.junit.Ignore;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.netbeans.html.json.tck.KOTest;
+import org.teavm.junit.SkipJVM;
+import org.teavm.junit.TeaVMTestRunner;
 
 /**
  *
  * @author Jaroslav Tulach
  */
-@Ignore
+@RunWith(TeaVMTestRunner.class)
+@SkipJVM
 public class KnockoutTCKCheckTest {
     @Test
-    public void allKnockoutTestMethodsOverriden() throws Exception {
+    public void allKnockoutTestMethodsOverridden() {
         for (Class<?> c : KnockoutFXTest.allTestClasses()) {
             if (c.getName().contains("GC")) {
                 continue;
diff --git a/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKTest.java b/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKTest.java
index 89dcb3347..cad0eeeec 100644
--- a/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKTest.java
+++ b/html4j/src/test/java/org/teavm/html4j/test/KnockoutTCKTest.java
@@ -21,7 +21,6 @@ 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.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.teavm.junit.SkipJVM;
@@ -35,8 +34,6 @@ import org.teavm.junit.WholeClassCompilation;
 @RunWith(TeaVMTestRunner.class)
 @SkipJVM
 @WholeClassCompilation
-@Ignore
-// TODO: fix JavaScriptBody implementation and unignore
 public class KnockoutTCKTest {
     private final ConvertTypesTest convertTypesTest = new ConvertTypesTest();
     private final JSONTest jsonTest = new JSONTest();