make axvline test more robust

Author: nschloe

test/test_axvline.py

@@ -10,6 +10,7 @@ def plot():
     fig = plt.figure()
     np.random.seed(123)
     s = np.random.normal(0, 1, 10)
+    plt.gca().set_ylim(-1.0, +1.0)
     plt.hist(s, 30)
     plt.axvline(1.96)
     return fig

test/test_axvline_reference.tex

@@ -8,7 +8,7 @@
 x grid style={white!69.01960784313725!black},
 xmin=-2.64601320556273, xmax=2.17933396216965,
 y grid style={white!69.01960784313725!black},
-ymin=0, ymax=1.05
+ymin=-1, ymax=1
 ]
 \draw[fill=color0,draw opacity=0] (axis cs:-2.42667924339307,0) rectangle (axis cs:-2.29074205071007,1);
 \draw[fill=color0,draw opacity=0] (axis cs:-2.29074205071007,0) rectangle (axis cs:-2.15480485802706,0);
@@ -42,8 +42,8 @@
 \draw[fill=color0,draw opacity=0] (axis cs:1.51549934441414,0) rectangle (axis cs:1.65143653709715,1);
 \addplot [semithick, color0]
 table {%
-1.96 0
-1.96 1.05
+1.96 -1
+1.96 1
 };
 \end{axis}