diff --git a/.gitignore b/.gitignore
index 0994fe6e..464a3ac3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,4 @@ node_modules
 
 # Generated by the generateApiBindings task (see codegen/, build.gradle)
 /src/main/java/com/zhekasmirnov/innercore/api/gen
+/src/test/java/com/zhekasmirnov/innercore/api/gen
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 0e673754..38dcffa9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -49,6 +49,15 @@ dependencies {
 
     implementation fileTree (dir: 'iclibs', include: '*.jar')
     implementation fileTree (dir: 'iclibs/dex2jar', include: '*.jar')
+
+    testImplementation(platform("org.junit:junit-bom:5.10.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+tasks.test {
+    dependsOn 'generateApiBindingsTest'
+    useJUnitPlatform()
 }
 
 def targetJavaVersion = 17
@@ -81,6 +90,25 @@ run {
 def apiGenSourceRoot = file('src/main/java/org/innercore')
 def apiGenOutputDir = layout.projectDirectory.dir('src/main/java/com/zhekasmirnov/innercore/api/gen')
 
+def apiGenSourceTestRoot = file('src/test/java/org/innercore')
+def apiGenOutputTestDir = layout.projectDirectory.dir('src/test/java/com/zhekasmirnov/innercore/api/gen')
+
+tasks.register('generateApiBindingsTest', JavaExec) {
+    group = 'codegen'
+    description = 'Generates JS binding base classes from @ApiBinding-annotated sources.'
+    javaLauncher = javaToolchains.launcherFor {
+        def javaVersion = JavaVersion.toVersion(targetJavaVersion)
+        if (JavaVersion.current() < javaVersion) {
+            languageVersion = JavaLanguageVersion.of(targetJavaVersion)
+        }
+    }
+    classpath = configurations.codegenClasspath
+    mainClass = 'org.innercore.codegen.Codegen'
+    args 'com.zhekasmirnov.innercore.api.gen', apiGenOutputTestDir.asFile.absolutePath, apiGenSourceTestRoot.absolutePath
+    inputs.files(fileTree(apiGenSourceRoot) { include '**/*.java' }).withPropertyName('apiBindingSources')
+    outputs.dir(apiGenOutputDir).withPropertyName('apiBindingOutput')
+}
+
 tasks.register('generateApiBindings', JavaExec) {
     group = 'codegen'
     description = 'Generates JS binding base classes from @ApiBinding-annotated sources.'
diff --git a/src/test/java/org/innercore/icstd/CodeGen.java b/src/test/java/org/innercore/icstd/CodeGen.java
new file mode 100644
index 00000000..954a6675
--- /dev/null
+++ b/src/test/java/org/innercore/icstd/CodeGen.java
@@ -0,0 +1,40 @@
+package org.innercore.icstd;
+
+import com.zhekasmirnov.innercore.api.gen.CodeGenBindGenBase;
+import org.innercore.icstd.annotations.ApiBinding;
+
+@ApiBinding
+public class CodeGen extends CodeGenBindGenBase {
+    @ApiBinding public int test;
+
+    @ApiBinding
+    public CodeGen() {
+        this.test = 5;
+    }
+
+    @ApiBinding
+    public int sum(int a, int b) {
+        return a + b;
+    }
+
+    @ApiBinding
+    public int sum(int a, int b, int c) {
+        return a + b + c;
+    }
+
+    @ApiBinding
+    public String other(String a, int b, CodeGen c) {
+        return a + b + c.test;
+    }
+
+    @ApiBinding
+    public static int staticSum(int a, int b) {
+        return a + b;
+    }
+
+    @ApiBinding
+    public static int staticSum(int a, int b, int c) {
+        return a + b + c;
+    }
+
+}
diff --git a/src/test/java/org/innercore/icstd/extension/TimingExtension.java b/src/test/java/org/innercore/icstd/extension/TimingExtension.java
new file mode 100644
index 00000000..a5510b3f
--- /dev/null
+++ b/src/test/java/org/innercore/icstd/extension/TimingExtension.java
@@ -0,0 +1,22 @@
+package org.innercore.icstd.extension;
+
+import org.junit.jupiter.api.extension.AfterTestExecutionCallback;
+import org.junit.jupiter.api.extension.BeforeTestExecutionCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+public class TimingExtension implements BeforeTestExecutionCallback, AfterTestExecutionCallback {
+    private static final String START_TIME = "start time";
+
+    @Override
+    public void beforeTestExecution(ExtensionContext context) throws Exception {
+        context.getStore(ExtensionContext.Namespace.GLOBAL)
+                .put(START_TIME, System.currentTimeMillis());
+    }
+
+    @Override
+    public void afterTestExecution(ExtensionContext context) throws Exception {
+        long startTime = context.getStore(ExtensionContext.Namespace.GLOBAL)
+                .remove(START_TIME, long.class);
+        System.out.printf("End test %s - %d ms%n", context.getDisplayName(), System.currentTimeMillis() - startTime);
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/org/innercore/icstd/test/CodeGenTest.java b/src/test/java/org/innercore/icstd/test/CodeGenTest.java
new file mode 100644
index 00000000..aedc9852
--- /dev/null
+++ b/src/test/java/org/innercore/icstd/test/CodeGenTest.java
@@ -0,0 +1,44 @@
+package org.innercore.icstd.test;
+
+import com.zhekasmirnov.innercore.api.gen.CodeGenBindGenBase;
+import org.innercore.icstd.extension.TimingExtension;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mozilla.javascript.Function;
+import org.mozilla.javascript.Scriptable;
+
+@ExtendWith(TimingExtension.class)
+public class CodeGenTest {
+    @Test
+    public void test() {
+        Scriptable api = CodeGenBindGenBase.createEmptyModuleObject();
+        CodeGenBindGenBase.injectJsStatic(api, true);
+
+        Function staticSum = (Function) api.get("staticSum", api);
+
+        assert ((Number) staticSum.call(null, null, null, new Object[]{5, 5, 5, 5})).intValue() == 15;
+        assert ((Number) staticSum.call(null, null, null, new Object[]{5, 5, 5})).intValue() == 15;
+        assert ((Number) staticSum.call(null, null, null, new Object[]{5, 5})).intValue() == 10;
+        assert ((Number) staticSum.call(null, null, null, new Object[]{5, null, 2f})).intValue() == 7;
+        assert ((Number) staticSum.call(null, null, null, new Object[]{"5", "5"})).intValue() == 10;
+
+        Scriptable self = ((Function) api).construct(null, null, new Object[]{});
+
+        Function sum = (Function) self.get("sum", self);
+
+        assert ((Number) sum.call(null, null, self, new Object[]{5, 5, 5, 5})).intValue() == 15;
+        assert ((Number) sum.call(null, null, self, new Object[]{5, 5, 5})).intValue() == 15;
+        assert ((Number) sum.call(null, null, self, new Object[]{5, 5})).intValue() == 10;
+        assert ((Number) sum.call(null, null, self, new Object[]{5, null, 2f})).intValue() == 7;
+        assert ((Number) sum.call(null, null, self, new Object[]{"5", "5"})).intValue() == 10;
+
+        Function other = (Function) self.get("other", self);
+
+        assert (other.call(null, null, self, new Object[]{"test", "5", self})).toString().equals("test55");
+
+        assert ((Number) self.get("test", self)).intValue() == 5;
+        self.put("test", self, 1);
+
+        assert (other.call(null, null, self, new Object[]{"test", "5", self})).toString().equals("test51");
+    }
+}