diff --git a/tests/unit/test_cli/__init__.py b/tests/unit/test_cli/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/test_cli/test_http/__init__.py b/tests/unit/test_cli/test_http/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/test_cli/test_http/test_api/__init__.py b/tests/unit/test_cli/test_http/test_api/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/test_cli/test_http/test_api/test_command_arguments.py b/tests/unit/test_cli/test_http/test_api/test_command_arguments.py
new file mode 100644
index 0000000..cc18b9f
--- /dev/null
+++ b/tests/unit/test_cli/test_http/test_api/test_command_arguments.py
@@ -0,0 +1,22 @@
+import argparse
+
+import pytest
+
+from enapter.cli.http.api import command_arguments
+
+
+def test_parse_command_arguments_none():
+    assert command_arguments.parse_command_arguments(None) == {}
+
+
+def test_parse_command_arguments_valid_json():
+    assert command_arguments.parse_command_arguments('{"foo": "bar", "baz": 1}') == {
+        "foo": "bar",
+        "baz": 1,
+    }
+
+
+def test_parse_command_arguments_invalid_json():
+    with pytest.raises(argparse.ArgumentTypeError) as excinfo:
+        command_arguments.parse_command_arguments("invalid json")
+    assert "Decode JSON:" in str(excinfo.value)