[subset] Unit test to check that post subsetting drops glyph names.

test/api/Makefile.am

diff --git a/test/api/Makefile.am b/test/api/Makefile.am
index 3c5a5cc..54e367f 100644
--- a/test/api/Makefile.am
+++ b/test/api/Makefile.am
@@ -36,6 +36,7 @@
 	test-subset-hdmx \
 	test-subset-hmtx \
 	test-subset-os2 \
+	test-subset-post \
 	test-subset-vmtx \
 	test-unicode \
 	test-version \
@@ -47,6 +48,7 @@
 test_subset_hdmx_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_hmtx_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_os2_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
+test_subset_post_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_vmtx_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 
 test_unicode_CPPFLAGS = \

test/api/fonts/Mplus1p-Regular.660E,6975,73E0,5EA6,8F38,6E05.ttf

diff --git a/test/api/fonts/Mplus1p-Regular.660E,6975,73E0,5EA6,8F38,6E05.ttf b/test/api/fonts/Mplus1p-Regular.660E,6975,73E0,5EA6,8F38,6E05.ttf
index 89c7a1a..2a978fb 100644
--- a/test/api/fonts/Mplus1p-Regular.660E,6975,73E0,5EA6,8F38,6E05.ttf
+++ b/test/api/fonts/Mplus1p-Regular.660E,6975,73E0,5EA6,8F38,6E05.ttf
Binary files differ

test/api/test-subset-post.c

diff --git a/test/api/test-subset-post.c b/test/api/test-subset-post.c
new file mode 100644
index 0000000..b34e2b7
--- /dev/null
+++ b/test/api/test-subset-post.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright © 2018  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Garret Rieger
+ */
+
+#include <stdbool.h>
+
+#include "hb-test.h"
+#include "hb-subset-test.h"
+
+/* Unit tests for hmtx subsetting */
+
+static void
+test_post_drops_glyph_names (void)
+{
+  hb_face_t *face_full = hb_subset_test_open_font ("fonts/Mplus1p-Regular.660E,6975,73E0,5EA6,8F38,6E05.ttf");
+  hb_face_t *face_subset = hb_subset_test_open_font ("fonts/Mplus1p-Regular.660E.ttf");
+
+  hb_set_t *codepoints = hb_set_create ();
+  hb_set_add (codepoints, 0x660E);
+
+  hb_face_t *face_full_subset = hb_subset_test_create_subset (face_full, hb_subset_test_create_input (codepoints));
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (face_subset, face_full_subset, HB_TAG ('p','o','s','t'));
+
+  hb_face_destroy (face_full_subset);
+  hb_face_destroy (face_full);
+  hb_face_destroy (face_subset);
+}
+
+int
+main (int argc, char **argv)
+{
+  hb_test_init (&argc, &argv);
+
+  hb_test_add (test_post_drops_glyph_names);
+
+  return hb_test_run();
+}