From 7d236d796ef6c802bf062650a1b53e947fab9164 Mon Sep 17 00:00:00 2001
From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Sun, 14 Feb 2021 09:43:25 -0800
Subject: [PATCH] add a test of user shapes

---
 rtest/test_regression.py | 17 +++++++++++++++++
 rtest/usershape.dot      |  3 +++
 rtest/usershape.svg      | 18 ++++++++++++++++++
 3 files changed, 38 insertions(+)
 create mode 100644 rtest/usershape.dot
 create mode 100644 rtest/usershape.svg

diff --git a/rtest/test_regression.py b/rtest/test_regression.py
index e60fde08b..9f5c8f6cb 100644
--- a/rtest/test_regression.py
+++ b/rtest/test_regression.py
@@ -749,3 +749,20 @@ def test_package_version():
 
       # run the test
       subprocess.check_call([exe])
+
+def test_user_shapes():
+    '''
+    Graphviz should understand how to embed a custom SVG image as a node’s shape
+    '''
+
+    # find our collocated test case
+    input = Path(__file__).parent / 'usershape.dot'
+    assert input.exists(), 'unexpectedly missing test case'
+
+    # ask Graphviz to translate this to SVG
+    output = subprocess.check_output(['dot', '-Tsvg', input],
+      cwd=os.path.dirname(__file__), universal_newlines=True)
+
+    # the external SVG should have been parsed and is now referenced
+    assert '<image xlink:href="usershape.svg" width="62px" height="44px" ' in \
+      output
diff --git a/rtest/usershape.dot b/rtest/usershape.dot
new file mode 100644
index 000000000..a6b9cfa14
--- /dev/null
+++ b/rtest/usershape.dot
@@ -0,0 +1,3 @@
+graph {
+  a[image="usershape.svg"];
+}
diff --git a/rtest/usershape.svg b/rtest/usershape.svg
new file mode 100644
index 000000000..0fb2fec0f
--- /dev/null
+++ b/rtest/usershape.svg
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version
+ -->
+<!-- Title: G Pages: 1 -->
+<svg width="62pt" height="44pt"
+ viewBox="0.00 0.00 62.00 44.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 40)">
+<title>G</title>
+<polygon fill="white" stroke="transparent" points="-4,4 -4,-40 58,-40 58,4 -4,4"/>
+<!-- a -->
+<g id="node1" class="node">
+<title>a</title>
+<polygon fill="none" stroke="black" points="27,-36 0,-9 54,-9 27,-36"/>
+</g>
+</g>
+</svg>
-- 
2.40.0