add test for the new --keep-cvar option to toggle cvar table removal off

Author: chrissimpkins

tests/test_main.py

@@ -148,6 +148,33 @@ def test_default_run_opensans_vf():
     shutil.rmtree(test_dir)
 
 
+def test_default_run_opensans_vf_keep_cvar():
+    """This is used to test cvar table removal in a var font"""
+    test_dir = os.path.join("tests", "test_files", "fonts", "temp")
+    notouch_inpath = os.path.join("tests", "test_files", "fonts", "OpenSans-VF.ttf")
+    test_inpath = os.path.join("tests", "test_files", "fonts", "temp", "OpenSans.ttf")
+    test_outpath = os.path.join(
+        "tests", "test_files", "fonts", "temp", "OpenSans-dehinted.ttf"
+    )
+    test_args = [test_inpath, "--keep-cvar"]
+
+    # setup
+    if os.path.isdir(test_dir):
+        shutil.rmtree(test_dir)
+    os.mkdir(test_dir)
+    shutil.copyfile(notouch_inpath, test_inpath)
+
+    # execute
+    run(test_args)
+
+    # test
+    font_validator(test_outpath)
+    assert "cvar" in TTFont(test_outpath)
+
+    # tear down
+    shutil.rmtree(test_dir)
+
+
 def test_run_roboto_keep_cvt():
     test_dir = os.path.join("tests", "test_files", "fonts", "temp")
     notouch_inpath = os.path.join("tests", "test_files", "fonts", "Roboto-Regular.ttf")