Remove randomness from test_colorbar_get_ticks_2.

The point of the test is to check that colorbar ticks have certain values when the scalarmappable's lower and upper lims are a bit more than 0 and a bit less than 1, respectively. Certainly sampling 30x30 random values will nearly always accomplish this, but we may as well just enforce the values.
CSCD01-team31 · McCoubs · May 8, 2020 · May 8, 2020 · May 8, 2020 · May 8, 2020
commit 17db319f8a5deeaac8b5376d75ed151a299bfb8f
diff --git a/lib/matplotlib/tests/test_colorbar.py b/lib/matplotlib/tests/test_colorbar.py
@@ -534,13 +534,11 @@ def test_colorbar_scale_reset():
 
 
 def test_colorbar_get_ticks_2():
-    with rc_context({'_internal.classic_mode': False}):
-
-        fig, ax = plt.subplots()
-        np.random.seed(19680801)
-        pc = ax.pcolormesh(np.random.rand(30, 30))
-        cb = fig.colorbar(pc)
-        np.testing.assert_allclose(cb.get_ticks(), [0.2, 0.4, 0.6, 0.8])
+    plt.rcParams['_internal.classic_mode'] = False
+    fig, ax = plt.subplots()
+    pc = ax.pcolormesh([[.05, .95]])
+    cb = fig.colorbar(pc)
+    np.testing.assert_allclose(cb.get_ticks(), [0.2, 0.4, 0.6, 0.8])
 
 
 def test_colorbar_inverted_ticks():