diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index fef6e43..1e15488 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -32,7 +32,7 @@ jobs:
       - name: Base setup
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
 
-      - name: Setup conda ${{ matrix.PYTHON_VERSION }}
+      - name: Setup conda ${{ matrix.python-version }}
         uses: conda-incubator/setup-miniconda@v2
         with:
           auto-update-conda: true
@@ -40,8 +40,14 @@ jobs:
           activate-environment: jupyter_kernel_test
           python-version: ${{ matrix.python-version }}
 
+      - name: Install xeus-cling
+        if: startsWith(runner.os, 'Linux')
+        run: |
+          conda install -c conda-forge xeus-cling
+
       - name: Install dependencies
-        run: pip install -e .[test]
+        run: |
+          pip install -e .[test]
 
       - name: Run the tests
         run: python -m unittest -v
diff --git a/MANIFEST.in b/MANIFEST.in
index cf17344..535da01 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,4 @@
 include *.py
 include *.md
+exclude setup_julia.sh
 exclude environment.yml
diff --git a/jupyter_kernel_test/__init__.py b/jupyter_kernel_test/__init__.py
index 0619086..d603433 100644
--- a/jupyter_kernel_test/__init__.py
+++ b/jupyter_kernel_test/__init__.py
@@ -229,9 +229,11 @@ def test_execute_result(self):
                         found = True
                     else:
                         continue
-                    self.assertIn('text/plain', msg['content']['data'])
-                    self.assertEqual(msg['content']['data']['text/plain'],
-                                    sample['result'])
+                    mime = sample.get('mime', 'text/plain')
+                    self.assertIn(mime, msg['content']['data'])
+                    if 'result' in sample:
+                        self.assertEqual(msg['content']['data'][mime],
+                                        sample['result'])
                 assert found, 'execute_result message not found'
 
     code_display_data = []
@@ -281,7 +283,7 @@ def test_history(self):
             raise SkipTest
 
         codes = [s['code'] for s in self.code_execute_result]
-        results = [s['result'] for s in self.code_execute_result]
+        results = [s.get('result', '') for s in self.code_execute_result]
         n = len(codes)
 
         session = start = None
diff --git a/jupyter_kernel_test/msgspec_v5.py b/jupyter_kernel_test/msgspec_v5.py
index 2b6774d..f7303ad 100644
--- a/jupyter_kernel_test/msgspec_v5.py
+++ b/jupyter_kernel_test/msgspec_v5.py
@@ -256,7 +256,7 @@ def validate_message(msg, msg_type=None, parent_id=None):
         "text": {"type": "string"},
         "url": {"type": "string"}
     }}}
-}, "required": ["status", "protocol_version", "implementation", "implementation_version", "language_info", "banner"]}
+}, "required": ["status", "protocol_version", "implementation", "language_info", "banner"]}
 
 schema_fragments['shutdown_request'] = {"properties": {
     "restart": {"type": "boolean"},
diff --git a/test_xues_cling.py b/test_xues_cling.py
new file mode 100644
index 0000000..7dffa75
--- /dev/null
+++ b/test_xues_cling.py
@@ -0,0 +1,43 @@
+"""
+A non-python example, with tests for IRKernel (irkernel.github.io).
+(Beware of python quoting/string escaping rules being different to the
+language being tested)
+"""
+
+import unittest
+import shutil
+
+from jupyter_client.kernelspec import NoSuchKernel
+import jupyter_kernel_test as jkt
+
+
+class XeusClingKernelTests(jkt.KernelTests):
+    kernel_name = "xcpp17"
+
+    @classmethod
+    def setUpClass(cls):
+        try:
+            cls.km, cls.kc = jkt.start_new_kernel(kernel_name=cls.kernel_name)
+        except NoSuchKernel:
+            raise unittest.SkipTest('Xeus-Cling Kernel not installed')
+
+    language_name = "c++"
+
+    file_extension = ".cpp"
+
+    code_hello_world = '#include <iostream>\nstd::cout << "hello, world!" << std::endl;'
+
+    code_stderr = '#include <iostream>\nstd::cerr << "some error" << std::endl;'
+
+    complete_code_samples = ['1', "int j=5"]
+    incomplete_code_samples = ["double sqr(double a"]
+
+    code_generate_error = 'throw std::runtime_error("Unknown exception");'
+
+    code_execute_result = [
+        {'code': 'int j = 5;j', 'result': "5"},
+    ]
+
+
+if __name__ == '__main__':
+    unittest.main()