chore: factor test_std outside test_common (#657)

* Moved test_std outside test_common

* Swapped constructor_eager fixture with constructor in test_std

pyproject.toml

@@ -90,7 +90,7 @@ filterwarnings = [
   'ignore:.*defaulting to pandas implementation',
   'ignore:.*implementation has mismatches with pandas',
   'ignore:.*Do not use the `random` module inside strategies',
-  'ignore:.*You are using pyarrow version 12',
+  'ignore:.*You are using pyarrow version',
 ]
 xfail_strict = true
 markers = ["slow: marks tests as slow (deselect with '-m \"not slow\"')"]

tests/frame/std_test.py

@@ -0,0 +1,25 @@
+from typing import Any
+
+import narwhals.stable.v1 as nw
+from tests.utils import compare_dicts
+
+data = {"a": [1, 3, 2], "b": [4, 4, 6], "z": [7.0, 8, 9]}
+
+
+def test_std(constructor: Any) -> None:
+    df = nw.from_native(constructor(data))
+    result = df.select(
+        nw.col("a").std().alias("a_ddof_default"),
+        nw.col("a").std(ddof=1).alias("a_ddof_1"),
+        nw.col("a").std(ddof=0).alias("a_ddof_0"),
+        nw.col("b").std(ddof=2).alias("b_ddof_2"),
+        nw.col("z").std(ddof=0).alias("z_ddof_0"),
+    )
+    expected = {
+        "a_ddof_default": [1.0],
+        "a_ddof_1": [1.0],
+        "a_ddof_0": [0.816497],
+        "b_ddof_2": [1.632993],
+        "z_ddof_0": [0.816497],
+    }
+    compare_dicts(result, expected)

tests/frame/test_common.py

@@ -19,25 +19,6 @@
 data_right = {"c": [6, 12, -1], "d": [0, -4, 2]}
 
 
-def test_std(constructor_eager: Any) -> None:
-    df = nw.from_native(constructor_eager(data))
-    result = df.select(
-        nw.col("a").std().alias("a_ddof_default"),
-        nw.col("a").std(ddof=1).alias("a_ddof_1"),
-        nw.col("a").std(ddof=0).alias("a_ddof_0"),
-        nw.col("b").std(ddof=2).alias("b_ddof_2"),
-        nw.col("z").std(ddof=0).alias("z_ddof_0"),
-    )
-    expected = {
-        "a_ddof_default": [1.0],
-        "a_ddof_1": [1.0],
-        "a_ddof_0": [0.816497],
-        "b_ddof_2": [1.632993],
-        "z_ddof_0": [0.816497],
-    }
-    compare_dicts(result, expected)
-
-
 @pytest.mark.filterwarnings("ignore:Determining|Resolving.*")
 def test_columns(constructor: Any) -> None:
     df = nw.from_native(constructor(data))