From bf4fb54b40c6d3dc33406a3912b00e95ab59d09a Mon Sep 17 00:00:00 2001
From: Oscar Gustafsson <oscar.gustafsson@gmail.com>
Date: Wed, 2 Nov 2022 14:30:15 +0100
Subject: [PATCH] Add test for colorbar extend alpha

---
 .../test_colorbar/colorbar_extend_alpha.png      | Bin 0 -> 2071 bytes
 lib/matplotlib/tests/test_colorbar.py            |   8 ++++++++
 2 files changed, 8 insertions(+)
 create mode 100644 lib/matplotlib/tests/baseline_images/test_colorbar/colorbar_extend_alpha.png

diff --git a/lib/matplotlib/tests/baseline_images/test_colorbar/colorbar_extend_alpha.png b/lib/matplotlib/tests/baseline_images/test_colorbar/colorbar_extend_alpha.png
new file mode 100644
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diff --git a/lib/matplotlib/tests/test_colorbar.py b/lib/matplotlib/tests/test_colorbar.py
index 4336b761f698..a921095bb121 100644
--- a/lib/matplotlib/tests/test_colorbar.py
+++ b/lib/matplotlib/tests/test_colorbar.py
@@ -1124,6 +1124,14 @@ def test_colorbar_set_formatter_locator():
     assert cb.ax.yaxis.get_minor_formatter() is fmt
 
 
+@image_comparison(['colorbar_extend_alpha.png'], remove_text=True,
+                  savefig_kwarg={'dpi': 40})
+def test_colorbar_extend_alpha():
+    fig, ax = plt.subplots()
+    im = ax.imshow([[0, 1], [2, 3]], alpha=0.3, interpolation="none")
+    fig.colorbar(im, extend='both', boundaries=[0.5, 1.5, 2.5])
+
+
 def test_offset_text_loc():
     plt.style.use('mpl20')
     fig, ax = plt.subplots()