Some more testing

tests/test_accuracy.py

@@ -65,7 +65,3 @@ def compute_errs(acc, plot=False):
 def loglog_slope(x, y):
     slope, intercept = np.polyfit(np.log(x), np.log(y), 1)
     return slope
-
-
-if __name__ == "__main__":
-    test_iterative_accuracy()

tests/test_grid.py

@@ -1,6 +1,6 @@
 import pytest
 
-from findiff.grids import EquidistantAxis
+from findiff.grids import EquidistantAxis, make_grid, make_axis
 
 
 def test_create_equidistantaxis():
@@ -23,3 +23,17 @@ def test_create_equidistantaxis_fails_invalid_args():
 
     with pytest.raises(ValueError, match="Dimension must be an integer"):
         EquidistantAxis(0.1, 1)
+
+
+def test_makegrid_with_none_returns_none():
+    assert make_grid(None) is None
+
+
+def test_makegrid_with_invalid_arg_raises_exception():
+    with pytest.raises(TypeError):
+        make_grid("sndljas")
+
+
+def test_makeaxis_with_gridaxis_returns_axis():
+    axis = EquidistantAxis(1, 1)
+    assert make_axis(1, axis) is axis