add test for dropImpliedOnCurves option

tests/integration_test.py

@@ -592,6 +592,24 @@ def test_apply_varfont_info(self, FontClass, compileMethod):
  expectTTX(fonts["MyFontVF1"], "TestVarFont-MyFontVF1.ttx", ["head", "name"])
  expectTTX(fonts["MyFontVF2"], "TestVarFont-MyFontVF2.ttx", ["head", "name"])
 
+ def test_compile_variable_ttf_drop_implied_oncurves(self, FontClass, caplog):
+ # https://github.com/googlefonts/ufo2ft/pull/817
+ designspace = DesignSpaceDocument.fromfile(getpath("OTestFont.designspace"))
+ designspace.loadSourceFonts(FontClass)
+
+ # dropImpliedOnCurves is False by default
+ vf1 = compileVariableTTF(designspace)
+
+ with caplog.at_level(logging.INFO, logger="fontTools.varLib"):
+ vf2 = compileVariableTTF(designspace, dropImpliedOnCurves=True)
+
+ assert "Failed to drop implied oncurves" not in caplog.text
+ assert "Dropped 4 on-curve points" in caplog.text
+
+ o1 = vf1["glyf"]["o"].coordinates
+ o2 = vf2["glyf"]["o"].coordinates
+ assert len(o1) == len(o2) + 4
+
 
 if __name__ == "__main__":
  sys.exit(pytest.main(sys.argv))