1 files changed, 77 insertions, 0 deletions
diff --git a/tests/unit/test_rest_helpers.py b/tests/unit/test_rest_helpers.py
new file mode 100644
index 0000000..5932fa5
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+++ b/tests/unit/test_rest_helpers.py
@@ -0,0 +1,77 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+from google.api_core import rest_helpers
+
+
+def test_flatten_simple_value():
+    with pytest.raises(TypeError):
+        rest_helpers.flatten_query_params("abc")
+
+
+def test_flatten_list():
+    with pytest.raises(TypeError):
+        rest_helpers.flatten_query_params(["abc", "def"])
+
+
+def test_flatten_none():
+    assert rest_helpers.flatten_query_params(None) == []
+
+
+def test_flatten_empty_dict():
+    assert rest_helpers.flatten_query_params({}) == []
+
+
+def test_flatten_simple_dict():
+    assert rest_helpers.flatten_query_params({"a": "abc", "b": "def"}) == [
+        ("a", "abc"),
+        ("b", "def"),
+    ]
+
+
+def test_flatten_repeated_field():
+    assert rest_helpers.flatten_query_params({"a": ["x", "y", "z", None]}) == [
+        ("a", "x"),
+        ("a", "y"),
+        ("a", "z"),
+    ]
+
+
+def test_flatten_nested_dict():
+    obj = {"a": {"b": {"c": ["x", "y", "z"]}}, "d": {"e": "uvw"}}
+    expected_result = [("a.b.c", "x"), ("a.b.c", "y"), ("a.b.c", "z"), ("d.e", "uvw")]
+
+    assert rest_helpers.flatten_query_params(obj) == expected_result
+
+
+def test_flatten_repeated_dict():
+    obj = {
+        "a": {"b": {"c": [{"v": 1}, {"v": 2}]}},
+        "d": "uvw",
+    }
+
+    with pytest.raises(ValueError):
+        rest_helpers.flatten_query_params(obj)
+
+
+def test_flatten_repeated_list():
+    obj = {
+        "a": {"b": {"c": [["e", "f"], ["g", "h"]]}},
+        "d": "uvw",
+    }
+
+    with pytest.raises(ValueError):
+        rest_helpers.flatten_query_params(obj)