write_font_test: add failing test to demostrate issue374 still applie…

…s for picosvg format

#324

tests/smiley_cheeks_gradient_svg.ttx

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ttFont sfntVersion="\x00\x01\x00\x00">
+
+  <GlyphOrder>
+    <!-- The 'id' attribute is only for humans; it is ignored when parsed. -->
+    <GlyphID id="0" name=".notdef"/>
+    <GlyphID id="1" name=".space"/>
+    <GlyphID id="2" name="e000"/>
+  </GlyphOrder>
+
+  <hmtx>
+    <mtx name=".notdef" width="0" lsb="0"/>
+    <mtx name=".space" width="100" lsb="0"/>
+    <mtx name="e000" width="100" lsb="0"/>
+  </hmtx>
+
+  <cmap>
+    <tableVersion version="0"/>
+    <cmap_format_4 platformID="0" platEncID="3" language="0">
+      <map code="0x20" name=".space"/><!-- SPACE -->
+      <map code="0xe000" name="e000"/><!-- ???? -->
+    </cmap_format_4>
+    <cmap_format_4 platformID="3" platEncID="1" language="0">
+      <map code="0x20" name=".space"/><!-- SPACE -->
+      <map code="0xe000" name="e000"/><!-- ???? -->
+    </cmap_format_4>
+  </cmap>
+
+  <loca>
+    <!-- The 'loca' table will be calculated by the compiler -->
+  </loca>
+
+  <glyf>
+
+    <!-- The xMin, yMin, xMax and yMax values
+         will be recalculated by the compiler. -->
+
+    <TTGlyph name=".notdef"/><!-- contains no outline data -->
+
+    <TTGlyph name=".space"/><!-- contains no outline data -->
+
+    <TTGlyph name="e000"/><!-- contains no outline data -->
+
+  </glyf>
+
+  <SVG>
+    <svgDoc endGlyphID="2" startGlyphID="2">
+      <![CDATA[<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">
+  <defs>
+    <path d="M44.75,69.83 A17.5 17.5 0 1 1 9.75,69.83 A17.5 17.5 0 1 1 44.75,69.83 Z" id="e000.0" fill="url(#g1)"/>
+    <radialGradient id="g1" cx="27.251" cy="73.507" r="19.038" gradientUnits="userSpaceOnUse" gradientTransform="matrix(1 0 0 0.95 0 0)">
+      <stop offset="0" stop-color="#ED7770" stop-opacity="0.8"/>
+      <stop offset="0.9" stop-color="#ED7770" stop-opacity="0"/>
+    </radialGradient>
+  </defs>
+  <g id="glyph2" transform="matrix(0.781 0 0 0.781 0 -100)">
+    <use xlink:href="#e000.0"/>
+    <use xlink:href="#e000.0" x="73.5"/>
+  </g>
+</svg>
+]]>
+    </svgDoc>
+  </SVG>
+
+</ttFont>

tests/write_font_test.py

@@ -310,6 +310,15 @@ def test_vertical_metrics(ascender, descender, linegap):
             "rect_sbix.ttx",
             {"color_format": "sbix"},
         ),
+        # The cheeks on the similing face noto-emoji are two identical circles painted
+        # with same radial gradients, translated some units apart; check that after we
+        # re<use> the same path for both cheeks, their gradients still looks ok.
+        # https://github.com/googlefonts/nanoemoji/issues/324
+        (
+            ("emoji_u263a.svg",),
+            "smiley_cheeks_gradient_svg.ttx",
+            {"color_format": "picosvg", "pretty_print": True},
+        ),
     ],
 )
 def test_write_font_binary(svgs, expected_ttx, config_overrides):