[instancer] add tests for gvar partial instancing

test/subset/data/Makefile.am

@@ -72,6 +72,7 @@ EXTRA_DIST += \
 	expected/collect_name_ids \
 	expected/instantiate_colrv1 \
 	expected/instantiate_cff2_update_metrics \
+	expected/glyf_partial_instancing \
 	fonts \
 	profiles \
 	$(NULL)

test/subset/data/Makefile.sources

@@ -63,6 +63,7 @@ TESTS = \
 	tests/collect_name_ids.tests \
 	tests/instantiate_colrv1.tests \
 	tests/instantiate_cff2_update_metrics.tests \
+	tests/glyf_partial_instancing.tests \
 	$(NULL)
 
 # TODO: re-enable once colrv1 subsetting is stabilized.

test/subset/data/profiles/no-tables-with-item-variations.txt

@@ -0,0 +1 @@
+--drop-tables+=MVAR,HVAR,VVAR,GDEF,COLR,GPOS

test/subset/data/tests/glyf_partial_instancing.tests

@@ -0,0 +1,13 @@
+FONTS:
+Roboto-Variable.ABC.ttf
+Roboto-Variable.composite.ttf
+
+PROFILES:
+no-tables-with-item-variations.txt
+
+SUBSETS:
+*
+
+INSTANCES:
+wght=300:600,wdth=85
+wght=200:300:500,wdth=80:90

test/subset/generate-expected-outputs.py

@@ -34,6 +34,7 @@ def generate_expected_output(input_file, unicodes, profile_flags, instance_flags
 		args = ["fonttools", "varLib.instancer",
 			"--no-overlap-flag",
 			"--no-recalc-timestamp",
+			"--no-optimize",
 			"--output=%s" % instance_path,
 			input_file]
 		args.extend(instance_flags)

test/subset/meson.build

@@ -65,6 +65,7 @@ tests = [
   'collect_name_ids',
   'instantiate_colrv1',
   'instantiate_cff2_update_metrics',
+  'glyf_partial_instancing',
 ]
 
 repack_tests = [