improve tests

Author: FredHappyface

pyproject.toml

@@ -28,6 +28,9 @@ pyppeteer = "<2,>=1.0.2"
 pytest = "^7.1.1"
 pylint = "^2.13.5"
 handsdown = "^1.1.0"
+coverage = "^6.3.2"
+imgcompare = "^2.0.1"
+nocairosvg = "^2022.0.1"
 
 [tool.pylint.basic]
 argument-naming-style = "camelCase"

tests/data/logo-actual-bw.png

@@ -2,12 +2,29 @@
 import sys
 from pathlib import Path
 
+import imgcompare
+from nocairosvg import svg2bitmap
+
 THISDIR = str(Path(__file__).resolve().parent)
 sys.path.insert(0, str(Path(THISDIR).parent))
 logoFile = f"{THISDIR}/data/logo"
 
 from svgtrace import trace
 
-Path(f"{logoFile}-bw.svg").write_text(trace(f"{logoFile}-bw.png", True), encoding="utf-8")
 
-Path(f"{logoFile}.svg").write_text(trace(f"{logoFile}.png"), encoding="utf-8")
+def aux_comparesvg(svgpath: str, pngpath: str):
+	output = f"{THISDIR}/data/{pngpath}"
+	svg2bitmap(url=svgpath, write_to=output)
+	imgcompare.is_equal(
+		output.replace("-expected", "-actual"), f"{THISDIR}/data/{pngpath}", tolerance=0.2
+	)
+
+
+def test_bw():
+	Path(f"{logoFile}-bw.svg").write_text(trace(f"{logoFile}-bw.png", True), encoding="utf-8")
+	aux_comparesvg(f"{logoFile}-bw.svg", "logo-actual-bw.png")
+
+
+def test_colour():
+	Path(f"{logoFile}.svg").write_text(trace(f"{logoFile}.png"), encoding="utf-8")
+	aux_comparesvg(f"{logoFile}.svg", "logo-actual.png")