diff --git a/Tests/ttLib/tables/T_S_I__0_test.py b/Tests/ttLib/tables/T_S_I__0_test.py
new file mode 100644
index 000000000..1de6b3412
--- /dev/null
+++ b/Tests/ttLib/tables/T_S_I__0_test.py
@@ -0,0 +1,106 @@
+from __future__ import print_function, division, absolute_import
+from fontTools.misc.py23 import SimpleNamespace
+from fontTools.misc.textTools import deHexStr
+from fontTools.misc.testTools import getXML
+from fontTools.ttLib.tables.T_S_I__0 import table_T_S_I__0
+import pytest
+
+
+# (gid, length, offset) for glyph programs
+TSI0_INDICES = [
+    (0, 1, 0),
+    (1, 5, 1),
+    (2, 0, 1),
+    (3, 0, 1),
+    (4, 8, 6)]
+
+# (type, length, offset) for 'extra' programs
+TSI0_EXTRA_INDICES = [
+    (0xFFFA, 2, 14),          # ppgm
+    (0xFFFB, 4, 16),          # cvt
+    (0xFFFC, 6, 20),          # reserved
+    (0xFFFD, 10, 26)]         # fpgm
+
+# compiled TSI0 table from data above
+TSI0_DATA = deHexStr(
+    "0000 0001 00000000"
+    "0001 0005 00000001"
+    "0002 0000 00000001"
+    "0003 0000 00000001"
+    "0004 0008 00000006"
+    "FFFE 0000 ABFC1F34"      # 'magic' separates glyph from extra programs
+    "FFFA 0002 0000000E"
+    "FFFB 0004 00000010"
+    "FFFC 0006 00000014"
+    "FFFD 000A 0000001A")
+
+# empty font has no glyph programs but 4 extra programs are always present
+EMPTY_TSI0_EXTRA_INDICES = [
+    (0xFFFA, 0, 0),
+    (0xFFFB, 0, 0),
+    (0xFFFC, 0, 0),
+    (0xFFFD, 0, 0)]
+
+EMPTY_TSI0_DATA = deHexStr(
+    "FFFE 0000 ABFC1F34"
+    "FFFA 0000 00000000"
+    "FFFB 0000 00000000"
+    "FFFC 0000 00000000"
+    "FFFD 0000 00000000")
+
+
+@pytest.fixture
+def table():
+    return table_T_S_I__0()
+
+
+@pytest.mark.parametrize(
+    "numGlyphs, data, expected_indices, expected_extra_indices",
+    [
+        (5, TSI0_DATA, TSI0_INDICES, TSI0_EXTRA_INDICES),
+        (0, EMPTY_TSI0_DATA, [], EMPTY_TSI0_EXTRA_INDICES)
+    ],
+    ids=["simple", "empty"]
+)
+def test_decompile(table, numGlyphs, data, expected_indices,
+                   expected_extra_indices):
+    font = {'maxp': SimpleNamespace(numGlyphs=numGlyphs)}
+
+    table.decompile(data, font)
+
+    assert len(table.indices) == numGlyphs
+    assert table.indices == expected_indices
+    assert len(table.extra_indices) == 4
+    assert table.extra_indices == expected_extra_indices
+
+
+@pytest.mark.parametrize(
+    "numGlyphs, indices, extra_indices, expected_data",
+    [
+        (5, TSI0_INDICES, TSI0_EXTRA_INDICES, TSI0_DATA),
+        (0, [], EMPTY_TSI0_EXTRA_INDICES, EMPTY_TSI0_DATA)
+    ],
+    ids=["simple", "empty"]
+)
+def test_compile(table, numGlyphs, indices, extra_indices, expected_data):
+    assert table.compile(ttFont=None) == b""
+
+    table.set(indices, extra_indices)
+    data = table.compile(ttFont=None)
+    assert data == expected_data
+
+
+def test_set(table):
+    table.set(TSI0_INDICES, TSI0_EXTRA_INDICES)
+    assert table.indices == TSI0_INDICES
+    assert table.extra_indices == TSI0_EXTRA_INDICES
+
+
+def test_toXML(table):
+    assert getXML(table.toXML, ttFont=None) == [
+        '<!-- This table will be calculated by the compiler -->']
+
+
+if __name__ == "__main__":
+    import sys
+    sys.exit(pytest.main(sys.argv))