diff --git a/js/tests/defaultKernels.test.ts b/js/tests/defaultKernels.test.ts
index 5750644a..6c9bbb3a 100644
--- a/js/tests/defaultKernels.test.ts
+++ b/js/tests/defaultKernels.test.ts
@@ -23,3 +23,10 @@ sandboxTest('test ts kernel errors', async ({ sandbox }) => {
   })
   expect(output.error?.name).toEqual('TypeScriptCompilerError')
 })
+
+sandboxTest('test ruby kernel', async ({ sandbox }) => {
+  const output = await sandbox.runCode('puts "Hello World!"', {
+    language: 'ruby',
+  })
+  expect(output.logs.stdout).toEqual(['Hello World!\n'])
+})
diff --git a/python/tests/async/test_async_default_kernels.py b/python/tests/async/test_async_default_kernels.py
index 83f92746..27b28cef 100644
--- a/python/tests/async/test_async_default_kernels.py
+++ b/python/tests/async/test_async_default_kernels.py
@@ -21,3 +21,8 @@ async def test_ts_kernel_errors(async_sandbox: AsyncSandbox):
     )
     assert execution.error is not None
     assert execution.error.name == "TypeScriptCompilerError"
+
+
+async def test_ruby_kernel(async_sandbox: AsyncSandbox):
+    execution = await async_sandbox.run_code("puts 'Hello, World!'", language="ruby")
+    assert execution.logs.stdout == ["Hello, World!\n"]
diff --git a/python/tests/sync/test_default_kernels.py b/python/tests/sync/test_default_kernels.py
index 0695defd..78c6210d 100644
--- a/python/tests/sync/test_default_kernels.py
+++ b/python/tests/sync/test_default_kernels.py
@@ -30,3 +30,8 @@ def test_ts_kernel_errors(sandbox: Sandbox):
     execution = sandbox.run_code("import x from 'module';", language="ts")
     assert execution.error is not None
     assert execution.error.name == "TypeScriptCompilerError"
+
+
+def test_ruby_kernel(sandbox: Sandbox):
+    execution = sandbox.run_code("puts 'Hello, World!'", language="ruby")
+    assert execution.logs.stdout == ["Hello, World!\n"]