TST: tune test parameters

- Make sure values are be big enough / small enough
- make long path test more pathological (Random data will sometimes go in the
  same direction)

Author: tacaswell

lib/matplotlib/tests/test_agg.py

@@ -75,10 +75,10 @@ def test_marker_with_nan():
 
 def test_long_path():
     buff = io.BytesIO()
-
-    fig, ax = plt.subplots()
-    np.random.seed(0)
-    points = np.random.rand(70000)
+    fig = Figure()
+    ax = fig.subplots()
+    points = np.ones(100_000)
+    points[::2] *= -1
     ax.plot(points)
     fig.savefig(buff, format='png')
 

lib/matplotlib/tests/test_simplification.py

@@ -305,8 +305,8 @@ def test_start_with_moveto():
 
 def test_throw_rendering_complexity_exceeded():
     plt.rcParams['path.simplify'] = False
-    xx = np.arange(200000)
-    yy = np.random.rand(200000)
+    xx = np.arange(2_000_000)
+    yy = np.random.rand(2_000_000)
     yy[1000] = np.nan
 
     fig, ax = plt.subplots()