Add additional test cases

svg-flatten/testdata/svg/circle_simple.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   width="50mm"
+   height="50mm"
+   viewBox="0 0 50 50"
+   version="1.1"
+   id="svg8">
+   <rect width="100%" height="100%" fill="white"/>
+  <ellipse
+     style="fill:none;stroke:#000000;stroke-width:5"
+     id="path850"
+     cx="25"
+     cy="25"
+     rx="20"
+     ry="20" />
+</svg>

svg-flatten/testdata/svg/last_dash.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   width="50mm"
+   height="50mm"
+   viewBox="0 0 50 50"
+   version="1.1"
+   id="svg8">
+   <rect width="100%" height="100%" fill="white"/>
+  <ellipse
+     style="fill:none;stroke:#000000;stroke-width:12;stroke-dasharray:18,8"
+     id="path850"
+     cx="25"
+     cy="25"
+     rx="15"
+     ry="15" />
+</svg>

svg-flatten/testdata/svg/stroke_dashes_comparison.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   width="50mm"
+   height="50mm"
+   viewBox="0 0 50 50"
+   version="1.1"
+   id="svg8">
+   <rect width="100%" height="100%" fill="white"/>
+  <ellipse
+     style="fill:none;stroke:#000000;stroke-width:5;stroke-dasharray:2.5, 2.5"
+     id="path850"
+     cx="25"
+     cy="25"
+     rx="20"
+     ry="20" />
+  <ellipse
+     style="fill:none;stroke:#000000;stroke-width:2.5;stroke-dasharray:1.25, 1.25"
+     id="path850-3"
+     cx="25"
+     cy="25"
+     rx="13.75"
+     ry="13.75" />
+  <ellipse
+     style="fill:none;stroke:#000000;stroke-width:1;stroke-dasharray:4,4"
+     id="path850-3-7"
+     cx="25"
+     cy="25"
+     rx="9.5"
+     ry="9.5" />
+  <ellipse
+     style="fill:none;stroke:#000000;stroke-width:0.5;stroke-dasharray:2,1"
+     id="path850-3-7-5"
+     cx="25"
+     cy="25"
+     rx="7"
+     ry="7" />
+  <ellipse
+     style="fill:none;stroke:#000000;stroke-width:0.2;stroke-dasharray:2.4,2.4"
+     id="path850-3-7-5-5"
+     cx="25"
+     cy="25"
+     rx="5"
+     ry="5" />
+</svg>