Use absolute path for blessing tests

tests/updatetests.py

@@ -1,12 +1,13 @@
-import click
-from conftest import DATA_DIR
+import base64
+import glob
 import os
-from pathlib import Path
 import subprocess
 import tempfile
-import glob
-import base64
+from pathlib import Path
 
+import click
+
+from conftest import DATA_DIR
 
 CHECKS = os.path.join(DATA_DIR, "checks")
 
@@ -21,7 +22,8 @@ def get_png(filename):
         stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
     with open("tmp.png", "rb") as f:
         png_data = f.read()
-    return "<img width=500 style=\"border: solid 1px black\" src=\"data:image/png;base64,{}\" />\n".format(base64.b64encode(png_data).decode())
+    return "<img width=500 style=\"border: solid 1px black\" src=\"data:image/png;base64,{}\" />\n".format(
+        base64.b64encode(png_data).decode())
 
 
 def do_report(differences, test_svg_paths):
@@ -41,7 +43,8 @@ def do_report(differences, test_svg_paths):
             os.chdir(tmpdir)
             for i, name in enumerate(sorted(differences)):
                 print("{}/{}".format(i, len(differences)))
-                out.append("<tr><td>{}/{}</td><td>{}<td></tr>".format(i+1, len(differences), name))
+                out.append(
+                    "<tr><td>{}/{}</td><td>{}<td></tr>".format(i + 1, len(differences), name))
 
                 out.append("<tr>")
                 check_name = os.path.join(CHECKS, name)
@@ -84,8 +87,10 @@ def run_update(differences, test_svg_paths):
 @click.argument("testpath")
 @click.option("--do-update/--do-not-update", default=False)
 def test_path(testpath, do_update):
+    testpath = os.path.abspath(testpath)
     check_names = set(path.name for path in Path(CHECKS).rglob('*.svg'))
-    test_svg_paths = {os.path.basename(path): path for path in glob.glob(os.path.join(testpath, '**/*.svg'))}
+    test_svg_paths = {os.path.basename(path): path for path in
+                      glob.glob(os.path.join(testpath, '**/*.svg'))}
     test_names = set(test_svg_paths.keys())
 
     differences = check_names.intersection(test_names)