TST: Simplify test_interp_string_axis and test_qcut_binning_issues (#62470)

Author: mroeschke

pandas/tests/frame/methods/test_interpolate.py

@@ -366,7 +366,7 @@ def test_interp_time_inplace_axis(self):
     @pytest.mark.parametrize("axis_name, axis_number", [("index", 0), ("columns", 1)])
     def test_interp_string_axis(self, axis_name, axis_number):
         # https://github.com/pandas-dev/pandas/issues/25190
-        x = np.linspace(0, 100, 1000)
+        x = np.linspace(0, 100, 3)
         y = np.sin(x)
         df = DataFrame(
             data=np.tile(y, (10, 1)), index=np.arange(10), columns=x

pandas/tests/reshape/test_qcut.py

@@ -101,23 +101,10 @@ def test_qcut_binning_issues(datapath):
     arr = np.loadtxt(cut_file)
     result = qcut(arr, 20)
 
-    starts = []
-    ends = []
-
-    for lev in np.unique(result):
-        s = lev.left
-        e = lev.right
-        assert s != e
-
-        starts.append(float(s))
-        ends.append(float(e))
-
-    for (sp, sn), (ep, en) in zip(
-        zip(starts[:-1], starts[1:]), zip(ends[:-1], ends[1:])
-    ):
-        assert sp < sn
-        assert ep < en
-        assert ep <= sn
+    starts = result.categories.left
+    ends = result.categories.right
+    assert (starts < ends).all()
+    assert (starts[1:] <= ends[:-1]).all()
 
 
 def test_qcut_return_intervals():