diff --git a/qupsy/test_spec.py b/qupsy/test_spec.py
new file mode 100644
index 0000000..eeaaed8
--- /dev/null
+++ b/qupsy/test_spec.py
@@ -0,0 +1,38 @@
+import numpy as np
+
+from qupsy.language import CX, H
+from qupsy.spec import SpecData, make_spec
+
+
+def test_parse_spec_from_json_data():
+    raw_spec: SpecData = {
+        "gates": ["H", "CX"],
+        "testcases": {
+            "1": {
+                "input": None,
+                "output": "0.70710677,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0.70710677",
+            },
+            "2": {
+                "input": None,
+                "output": "0.70710677, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.70710677",
+            },
+            "3": {"input": None, "output": "0.70710677,0,0,0,0,0,0,0.70710677"},
+        },
+    }
+    spec = make_spec(raw_spec)
+    assert spec.gates == [H, CX]
+    assert len(spec.testcases) == 3
+    for input, output in spec.testcases:
+        assert isinstance(input, np.ndarray)
+        assert isinstance(output, np.ndarray)
+        input_size: int = np.log2(input.size)
+        output_size: int = np.log2(output.size)
+        assert input_size == output_size
+        input_equal_to_one: int = 0
+        for i in input:
+            input_equal_to_one += np.abs(i) ** 2
+        assert np.isclose(input_equal_to_one, 1)
+        output_equal_to_one = 0
+        for i in output:
+            output_equal_to_one += np.abs(i) ** 2
+        assert np.isclose(output_equal_to_one, 1)