add tests for build value merge

Signed-off-by: Sergei Biriukov <svbiriukov@gmail.com>

pytests/test_rec_merge_one_build.py

@@ -0,0 +1,76 @@
+import copy
+
+import pytest
+
+from podman_compose import rec_merge_one
+
+test_cases = [
+    ({}, {"build": "."}, {"build": {"context": "."}}),
+    ({"build": "."}, {}, {"build": {"context": "."}}),
+    ({"build": "./dir-1"}, {"build": "./dir-2"}, {"build": {"context": "./dir-2"}}),
+    ({}, {"build": {"context": "./dir-1"}}, {"build": {"context": "./dir-1"}}),
+    ({"build": {"context": "./dir-1"}}, {}, {"build": {"context": "./dir-1"}}),
+    (
+        {"build": {"context": "./dir-1"}},
+        {"build": {"context": "./dir-2"}},
+        {"build": {"context": "./dir-2"}},
+    ),
+    (
+        {},
+        {"build": {"dockerfile": "./compose.yaml"}},
+        {"build": {"dockerfile": "./compose.yaml"}},
+    ),
+    (
+        {"build": {"dockerfile": "./compose.yaml"}},
+        {},
+        {"build": {"dockerfile": "./compose.yaml"}},
+    ),
+    (
+        {"build": {"dockerfile": "./compose-1.yaml"}},
+        {"build": {"dockerfile": "./compose-2.yaml"}},
+        {"build": {"dockerfile": "./compose-2.yaml"}},
+    ),
+    (
+        {"build": {"dockerfile": "./compose-1.yaml"}},
+        {"build": {"context": "./dir-2"}},
+        {"build": {"dockerfile": "./compose-1.yaml", "context": "./dir-2"}},
+    ),
+    (
+        {"build": {"dockerfile": "./compose-1.yaml", "context": "./dir-1"}},
+        {"build": {"dockerfile": "./compose-2.yaml", "context": "./dir-2"}},
+        {"build": {"dockerfile": "./compose-2.yaml", "context": "./dir-2"}},
+    ),
+]
+
+
+def test_rec_merge_one_for_build():
+    for base, override, expected in copy.deepcopy(test_cases):
+        base_original = copy.deepcopy(base)
+        base = rec_merge_one(base, override)
+        test_result = expected == base
+        if not test_result:
+            print("base:     ", base_original)
+            print("override: ", override)
+            print("expected: ", expected)
+            print("actual:   ", base)
+        assert test_result
+
+
+test_cases_with_exceptions = [
+    ({}, {"build": 1234}, ValueError),
+    ({"build": 1234}, {}, ValueError),
+    ({"build": 1234}, {"build": 1234}, ValueError),
+    ({"build": []}, {}, ValueError),
+    ({}, {"build": []}, ValueError),
+    ({"build": []}, {"build": []}, ValueError),
+]
+
+
+def test_rec_merge_one_for_build_eception():
+    for base, override, expected_exception in copy.deepcopy(test_cases_with_exceptions):
+        base_original = copy.deepcopy(base)
+        with pytest.raises(expected_exception):
+            base = rec_merge_one(base, override)
+            print("base:     ", base_original)
+            print("override: ", override)
+            print("expected: ", expected_exception)