1 files changed, 48 insertions, 0 deletions
diff --git a/Tests/ttLib/ttFont_test.py b/Tests/ttLib/ttFont_test.py
new file mode 100644
index 00000000..47cedeb7
--- /dev/null
+++ b/Tests/ttLib/ttFont_test.py
@@ -0,0 +1,48 @@
+import io
+from fontTools.ttLib import TTFont, newTable, registerCustomTableClass, unregisterCustomTableClass
+from fontTools.ttLib.tables.DefaultTable import DefaultTable
+
+
+class CustomTableClass(DefaultTable):
+
+    def decompile(self, data, ttFont):
+        self.numbers = list(data)
+
+    def compile(self, ttFont):
+        return bytes(self.numbers)
+
+    # not testing XML read/write
+
+
+table_C_U_S_T_ = CustomTableClass  # alias for testing
+
+
+TABLETAG = "CUST"
+
+
+def test_registerCustomTableClass():
+    font = TTFont()
+    font[TABLETAG] = newTable(TABLETAG)
+    font[TABLETAG].data = b"\x00\x01\xff"
+    f = io.BytesIO()
+    font.save(f)
+    f.seek(0)
+    assert font[TABLETAG].data == b"\x00\x01\xff"
+    registerCustomTableClass(TABLETAG, "ttFont_test", "CustomTableClass")
+    try:
+        font = TTFont(f)
+        assert font[TABLETAG].numbers == [0, 1, 255]
+        assert font[TABLETAG].compile(font) == b"\x00\x01\xff"
+    finally:
+        unregisterCustomTableClass(TABLETAG)
+
+
+def test_registerCustomTableClassStandardName():
+    registerCustomTableClass(TABLETAG, "ttFont_test")
+    try:
+        font = TTFont()
+        font[TABLETAG] = newTable(TABLETAG)
+        font[TABLETAG].numbers = [4, 5, 6]
+        assert font[TABLETAG].compile(font) == b"\x04\x05\x06"
+    finally:
+        unregisterCustomTableClass(TABLETAG)