Merge pull request matplotlib#26347 from oscargus/formattest

Add tests for LogFormatter.format_data and format_data_short

Author: QuLogic

lib/matplotlib/tests/test_ticker.py

@@ -1131,6 +1131,20 @@ def test_pprint(self, value, domain, expected):
         label = fmt._pprint_val(value, domain)
         assert label == expected
 
+    @pytest.mark.parametrize('value, long, short', [
+        (0.0, "0", "0           "),
+        (0, "0", "0           "),
+        (-1.0, "-10^0", "-1          "),
+        (2e-10, "2x10^-10", "2e-10       "),
+        (1e10, "10^10", "1e+10       "),
+    ])
+    def test_format_data(self, value, long, short):
+        fig, ax = plt.subplots()
+        ax.set_xscale('log')
+        fmt = ax.xaxis.get_major_formatter()
+        assert fmt.format_data(value) == long
+        assert fmt.format_data_short(value) == short
+
     def _sub_labels(self, axis, subs=()):
         """Test whether locator marks subs to be labeled."""
         fmt = axis.get_minor_formatter()