Add test case for #203

Signed-off-by: Niels Thykier <niels@thykier.net>

testscour.py

@@ -1401,6 +1401,20 @@ class RemoveDuplicateRadialGradients(unittest.TestCase):
                          'Duplicate radial gradient not removed')
 
 
+class RemoveDuplicateRadialGradientsEnsureMasterHasID(unittest.TestCase):
+
+    def runTest(self):
+        svgdoc = scourXmlFile('unittests/remove-duplicate-gradients-master-without-id.svg')
+        lingrads = svgdoc.getElementsByTagNameNS(SVGNS, 'linearGradient')
+        rect = svgdoc.getElementById('r1')
+        self.assertEqual(1, lingrads.length,
+                         'Duplicate linearGradient not removed')
+        self.assertEqual(lingrads[0].getAttribute("id"), "g1",
+                         "linearGradient has a proper ID")
+        self.assertNotEqual(rect.getAttribute("fill"), "url(#)",
+                            "linearGradient has a proper ID")
+
+
 class RereferenceForRadialGradient(unittest.TestCase):
 
     def runTest(self):

unittests/remove-duplicate-gradients-master-without-id.svg

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+	<linearGradient x1="0" y1="0" x2="1" y2="1">
+		<stop offset="0" stop-color="red"/>
+		<stop offset="1" stop-color="blue"/>
+	</linearGradient>
+	<linearGradient id='g1' x1='0' y1='0' x2='1' y2='1'>
+		<stop offset='0' stop-color='red'/>
+		<stop offset='1' stop-color='blue'/>
+	</linearGradient>
+	<linearGradient x1='0' y1='0' x2='1' y2='1'>
+		<stop offset='0' stop-color='red'/>
+		<stop offset='1' stop-color='blue'/>
+	</linearGradient>
+
+	<rect id="r1" fill="url(#g1)" width="100" height="100"/>
+</svg>