整理: テストユーティリティのテストを追加 (#1355)

* refactor: テストユーティリティのテストを追加

* fix: lint

test/test_utility.py

@@ -0,0 +1,43 @@
+"""テストユーティリティのテスト"""
+
+from test.utility import round_floats
+
+
+def test_round_floats_raw_float() -> None:
+    """`round_floats()` は値を丸める。"""
+    # Inputs
+    target = 111.111
+    # Tests
+    assert round_floats(target, -2) == 100
+    assert round_floats(target, -1) == 110
+    assert round_floats(target, 0) == 111
+    assert round_floats(target, +1) == 111.1
+    assert round_floats(target, +2) == 111.11
+
+
+def test_round_floats_list() -> None:
+    """`round_floats()` はリスト内の値を丸める。"""
+    # Inputs
+    target = [1.111, 8.888]
+    # Tests
+    assert round_floats(target, 2) == [1.11, 8.89]
+
+
+def test_round_floats_dict() -> None:
+    """`round_floats()` は辞書内の値を丸める。"""
+    # Inputs
+    target = {"hello": 1.111}
+    # Tests
+    assert round_floats(target, 2) == {"hello": 1.11}
+
+
+def test_round_floats_nested() -> None:
+    """`round_floats()` はネストしたオブジェクト内の値を丸める。"""
+    # Inputs
+    target = [1.111, {"hello": 1.111, "world": [1.111]}]
+    # Expects
+    true_rounded = [1.11, {"hello": 1.11, "world": [1.11]}]
+    # Outputs
+    rounded = round_floats(target, 2)
+    # Tests
+    assert true_rounded == rounded