Remove bad test. Cannot gaurantee the value is better or worse in dif…

…ferent bands.

tests/test_precision.py

@@ -126,16 +126,13 @@ def test_transmission_reduces_precision(test_spec):
     )
 
 
-@pytest.mark.xfail()  # Failing randomly...
-def test_improved_gradient_reduces_precision(test_spec):
-    """Check that the gradient produces larger RV error."""
+def test_both_gradients_possible(test_spec):
     wav = test_spec[0]
     flux = test_spec[1]
     transmission = test_spec[2]
-
     a = rv_precision(wav, flux, mask=transmission, grad=False).value
     b = rv_precision(wav, flux, mask=transmission, grad=True).value
-    assert a <= b
+    assert True
 
 
 @pytest.mark.parametrize("scale", [0.1, 1, 2, 100, 0.1, 0.5])