Initial upload: ConfigConvert CLI with full test suite and CI/CD

tests/test_flatten.py

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+"""Tests for flatten/unflatten utilities."""
+
+import pytest
+
+from config_convert.utils import flatten_dict, unflatten_dict
+
+
+class TestFlattenDict:
+    def test_flatten_simple_dict(self):
+        data = {"name": "test", "value": 123}
+        result = flatten_dict(data)
+        assert result == {"name": "test", "value": 123}
+
+    def test_flatten_nested_dict(self):
+        data = {"database": {"host": "localhost", "port": 5432}}
+        result = flatten_dict(data)
+        assert result == {"database.host": "localhost", "database.port": 5432}
+
+    def test_flatten_deeply_nested(self):
+        data = {"a": {"b": {"c": {"d": "deep"}}}}
+        result = flatten_dict(data)
+        assert result == {"a.b.c.d": "deep"}
+
+    def test_flatten_with_list(self):
+        data = {"items": [{"name": "a"}, {"name": "b"}]}
+        result = flatten_dict(data)
+        assert result == {"items[0].name": "a", "items[1].name": "b"}
+
+    def test_flatten_with_custom_sep(self):
+        data = {"database": {"host": "localhost"}}
+        result = flatten_dict(data, sep="_")
+        assert result == {"database_host": "localhost"}
+
+    def test_flatten_mixed_types(self):
+        data = {
+            "name": "test",
+            "count": 42,
+            "enabled": True,
+            "database": {"host": "localhost", "port": 5432},
+            "tags": ["a", "b", "c"]
+        }
+        result = flatten_dict(data)
+        assert "name" in result
+        assert "database.host" in result
+        assert "tags[0]" in result
+
+
+class TestUnflattenDict:
+    def test_unflatten_simple_dict(self):
+        data = {"name": "test", "value": 123}
+        result = unflatten_dict(data)
+        assert result == data
+
+    def test_unflatten_nested_dict(self):
+        data = {"database.host": "localhost", "database.port": 5432}
+        result = unflatten_dict(data)
+        assert result == {"database": {"host": "localhost", "port": 5432}}
+
+    def test_unflatten_deeply_nested(self):
+        data = {"a.b.c.d": "deep"}
+        result = unflatten_dict(data)
+        assert result == {"a": {"b": {"c": {"d": "deep"}}}}
+
+    def test_unflatten_with_brackets(self):
+        data = {"items[0].name": "a", "items[1].name": "b"}
+        result = unflatten_dict(data)
+        assert result == {"items": [{"name": "a"}, {"name": "b"}]}
+
+    def test_unflatten_with_custom_sep(self):
+        data = {"database_host": "localhost", "database_port": 5432}
+        result = unflatten_dict(data, sep="_")
+        assert result == {"database": {"host": "localhost", "port": 5432}}
+
+
+class TestFlattenUnflattenRoundtrip:
+    def test_roundtrip_simple(self):
+        original = {"name": "test", "value": 123}
+        flat = flatten_dict(original)
+        result = unflatten_dict(flat)
+        assert result == original
+
+    def test_roundtrip_nested(self):
+        original = {"database": {"host": "localhost", "port": 5432}}
+        flat = flatten_dict(original)
+        result = unflatten_dict(flat)
+        assert result == original
+
+    def test_roundtrip_with_lists(self):
+        original = {"items": [{"name": "a"}, {"name": "b"}]}
+        flat = flatten_dict(original)
+        result = unflatten_dict(flat)
+        assert result == original
+
+    def test_roundtrip_complex(self):
+        original = {
+            "name": "test",
+            "database": {
+                "host": "localhost",
+                "port": 5432,
+                "settings": {"timeout": 30, "retries": 3}
+            },
+            "tags": ["a", "b", "c"]
+        }
+        flat = flatten_dict(original)
+        result = unflatten_dict(flat)
+        assert result == original
+
+
+class TestKeyConflict:
+    def test_key_conflict_raises(self):
+        data = {"a": "value", "a.b": "conflict"}
+        with pytest.raises(ValueError):
+            unflatten_dict(data)