TST: IndexEngine overrides

Author: alexhlim

pandas/tests/indexes/test_indexing.py

@@ -264,7 +264,44 @@ def test_getitem_deprecated_float(idx):
 
 
 @pytest.mark.parametrize(
-    "idx, target, expected",
+    "idx,targets",
+    [(Float64Index([]), np.array([np.nan])), (DatetimeIndex([]), np.array([NaT]))],
+)
+def test_get_stargets(idx, targets):
+    # GH 35392
+    assert -1 in idx._engine.get_stargets(targets)
+
+
+@pytest.mark.parametrize(
+    "idx,val,expected",
+    [
+        (Int64Index([]), 1, 1),
+        (Float64Index([]), np.nan, -1),
+        (DatetimeIndex([]), NaT, -1),
+    ],
+)
+def test_convert_val_if_nan(idx, val, expected):
+    # GH 35392
+    assert idx._engine.convert_val_if_nan(val) == expected
+
+
+@pytest.mark.parametrize(
+    "idx,target,val,expected",
+    [
+        (Int64Index([]), 1, 1, True),
+        (Float64Index([]), np.nan, np.nan, True),
+        (Float64Index([]), 1, np.nan, False),
+        (DatetimeIndex([]), NaT, NaT, True),
+        (DatetimeIndex([]), 1, NaT, False),
+    ],
+)
+def test_should_update_d(idx, target, val, expected):
+    # GH 35392
+    assert idx._engine.should_update_d(target, val) == expected
+
+
+@pytest.mark.parametrize(
+    "idx,target,expected",
     [
         ([np.nan, "var1", np.nan], [np.nan], np.array([0, 2], dtype=np.intp)),
         (