diff --git a/test/image/baselines/gl2d_clean-number.png b/test/image/baselines/gl2d_clean-number.png
new file mode 100644
index 00000000000..4143c7c7dce
Binary files /dev/null and b/test/image/baselines/gl2d_clean-number.png differ
diff --git a/test/image/mocks/gl2d_clean-number.json b/test/image/mocks/gl2d_clean-number.json
new file mode 100644
index 00000000000..6969e2d58fd
--- /dev/null
+++ b/test/image/mocks/gl2d_clean-number.json
@@ -0,0 +1,7 @@
+{
+  "data": [{
+    "type": "scattergl",
+    "x": ["1", " 2 ", "3$", "4%"],
+    "y": ["1", "   2    ", "$3", "%4"]
+  }]
+}