diff --git a/Tests/colorLib/builder_test.py b/Tests/colorLib/builder_test.py
index fae00a419..73d6089ca 100644
--- a/Tests/colorLib/builder_test.py
+++ b/Tests/colorLib/builder_test.py
@@ -385,6 +385,29 @@ def test_buildPaintRadialGradient():
     assert gradient.ColorLine.ColorStop == color_stops
 
 
+def test_buildPaintSweepGradient():
+    layerBuilder = LayerV1ListBuilder()
+    paint = layerBuilder.buildPaintSweepGradient(
+        colorLine=builder.buildColorLine(
+            stops=[
+                builder.buildColorStop(0.0, 0),
+                builder.buildColorStop(0.5, 1),
+                builder.buildColorStop(1.0, 2, alpha=0.8),
+            ],
+        ),
+        centerX=127,
+        centerY=129,
+        startAngle=15,
+        endAngle=42,
+    )
+
+    assert paint.Format == ot.Paint.Format.PaintSweepGradient
+    assert paint.centerX.value == 127
+    assert paint.centerY.value == 129
+    assert paint.startAngle.value == 15
+    assert paint.endAngle.value == 42
+
+
 def test_buildPaintGlyph_Solid():
     layerBuilder = LayerV1ListBuilder()
     layer = layerBuilder.buildPaintGlyph("a", 2)
diff --git a/Tests/ttLib/tables/C_O_L_R_test.py b/Tests/ttLib/tables/C_O_L_R_test.py
index b5ee9f5f1..0560084be 100644
--- a/Tests/ttLib/tables/C_O_L_R_test.py
+++ b/Tests/ttLib/tables/C_O_L_R_test.py
@@ -106,7 +106,7 @@ COLR_V1_SAMPLE = (
     (b"\x00\x00\x00 ", "Offset to LayerRecordArray from beginning of table (32)"),
     (b"\x00\x03", "LayerRecordCount (3)"),
     (b"\x00\x00\x00,", "Offset to BaseGlyphV1List from beginning of table (44)"),
-    (b"\x00\x00\x00\x81", "Offset to LayerV1List from beginning of table (129)"),
+    (b"\x00\x00\x00\xcc", "Offset to LayerV1List from beginning of table (204)"),
     (b"\x00\x00\x00\x00", "Offset to VarStore (NULL)"),
     (b"\x00\x06", "BaseGlyphRecord[0].BaseGlyph (6)"),
     (b"\x00\x00", "BaseGlyphRecord[0].FirstLayerIndex (0)"),
@@ -117,20 +117,28 @@ COLR_V1_SAMPLE = (
     (b"\x00\x01", "LayerRecord[1].PaletteIndex (1)"),
     (b"\x00\t", "LayerRecord[2].LayerGlyph (9)"),
     (b"\x00\x02", "LayerRecord[2].PaletteIndex (2)"),
-    (b"\x00\x00\x00\x02", "BaseGlyphV1List.BaseGlyphCount (2)"),
+    # BaseGlyphV1List
+    (b"\x00\x00\x00\x03", "BaseGlyphV1List.BaseGlyphCount (3)"),
     (b"\x00\n", "BaseGlyphV1List.BaseGlyphV1Record[0].BaseGlyph (10)"),
-    (
-        b"\x00\x00\x00\x10",
-        "Offset to Paint table from beginning of BaseGlyphV1List (16)",
-    ),
-    (b"\x00\x0e", "BaseGlyphV1List.BaseGlyphV1Record[1].BaseGlyph (14)"),
     (
         b"\x00\x00\x00\x16",
         "Offset to Paint table from beginning of BaseGlyphV1List (22)",
     ),
+    (b"\x00\x0e", "BaseGlyphV1List.BaseGlyphV1Record[1].BaseGlyph (14)"),
+    (
+        b"\x00\x00\x00\x1c",
+        "Offset to Paint table from beginning of BaseGlyphV1List (28)",
+    ),
+    (b"\x00\x0f", "BaseGlyphV1List.BaseGlyphV1Record[2].BaseGlyph (15)"),
+    (
+        b"\x00\x00\x00\x5b",
+        "Offset to Paint table from beginning of BaseGlyphV1List (91)",
+    ),
+    # BaseGlyphV1Record[0]
     (b"\x01", "BaseGlyphV1Record[0].Paint.Format (1)"),
     (b"\x04", "BaseGlyphV1Record[0].Paint.NumLayers (4)"),
     (b"\x00\x00\x00\x00", "BaseGlyphV1Record[0].Paint.FirstLayerIndex (0)"),
+    # BaseGlyphV1Record[1]
     (b"\x0C", "BaseGlyphV1Record[1].Paint.Format (12)"),
     (b"\x00\x00<", "Offset to SourcePaint from beginning of PaintComposite (60)"),
     (b"\x03", "BaseGlyphV1Record[1].Paint.CompositeMode [SRC_OVER] (3)"),
@@ -145,6 +153,29 @@ COLR_V1_SAMPLE = (
     (b"\x00\x00\x00\x00\x00\x00\x00\x00", "Affine2x3.dy.value (0.0)"),
     (b"\x07", "BaseGlyphV1Record[1].Paint.SourcePaint.Format (7)"),
     (b"\x00\n", "BaseGlyphV1Record[1].Paint.SourcePaint.Glyph (10)"),
+    # BaseGlyphV1Record[2]
+    (b"\x06", "BaseGlyphV1Record[2].Paint.Format (6)"),
+    (b"\x00\x00\x06", "Offset to Paint subtable from beginning of PaintGlyph (6)"),
+    (b"\x00\x0b", "BaseGlyphV1Record[2].Paint.Glyph (11)"),
+    (b"\x05", "BaseGlyphV1Record[2].Paint.Paint.Format (5)"),
+    (b"\x00\x00 ", "Offset to ColorLine from beginning of PaintSweepGradient (32)"),
+    (b"\x01\x03\x00\x00\x00\x00", "centerX.value (259)"),
+    (b"\x01\x2c\x00\x00\x00\x00", "centerY.value (300)"),
+    (b"\x00\x2d\x00\x00\x00\x00\x00\x00", "startAngle (45.0)"),
+    (b"\x00\x87\x00\x00\x00\x00\x00\x00", "endAngle (135.0)"),
+    (b"\x00", "ColorLine.Extend (0; pad)"),
+    (b"\x00\x02", "ColorLine.StopCount (2)"),
+    (b"\x00\x00", "ColorLine.ColorStop[0].StopOffset.value (0.0)"),
+    (b"\x00\x00\x00\x00", "ColorLine.ColorStop[0].StopOffset.varIdx (0)"),
+    (b"\x00\x03", "ColorLine.ColorStop[0].Color.PaletteIndex (3)"),
+    (b"@\x00", "ColorLine.ColorStop[0].Color.Alpha.value (1.0)"),
+    (b"\x00\x00\x00\x00", "ColorLine.ColorStop[0].Color.Alpha.varIdx (0)"),
+    (b"@\x00", "ColorLine.ColorStop[1].StopOffset.value (1.0)"),
+    (b"\x00\x00\x00\x00", "ColorLine.ColorStop[1].StopOffset.varIdx (0)"),
+    (b"\x00\x05", "ColorLine.ColorStop[1].Color.PaletteIndex (5)"),
+    (b"@\x00", "ColorLine.ColorStop[1].Color.Alpha.value (1.0)"),
+    (b"\x00\x00\x00\x00", "ColorLine.ColorStop[1].Color.Alpha.varIdx (0)"),
+    # LayerV1List
     (b"\x00\x00\x00\x04", "LayerV1List.LayerCount (4)"),
     (
         b"\x00\x00\x00\x14",
@@ -286,7 +317,7 @@ COLR_V1_XML = [
     "</LayerRecordArray>",
     "<!-- LayerRecordCount=3 -->",
     "<BaseGlyphV1List>",
-    "  <!-- BaseGlyphCount=2 -->",
+    "  <!-- BaseGlyphCount=3 -->",
     '  <BaseGlyphV1Record index="0">',
     '    <BaseGlyph value="glyph00010"/>',
     '    <Paint Format="1"><!-- PaintColrLayers -->',
@@ -316,6 +347,36 @@ COLR_V1_XML = [
     "      </BackdropPaint>",
     "    </Paint>",
     "  </BaseGlyphV1Record>",
+    '  <BaseGlyphV1Record index="2">',
+    '    <BaseGlyph value="glyph00015"/>',
+    '    <Paint Format="6"><!-- PaintGlyph -->',
+    '      <Paint Format="5"><!-- PaintSweepGradient -->',
+    "        <ColorLine>",
+    '          <Extend value="pad"/>',
+    "          <!-- StopCount=2 -->",
+    '          <ColorStop index="0">',
+    '            <StopOffset value="0.0"/>',
+    "            <Color>",
+    '              <PaletteIndex value="3"/>',
+    '              <Alpha value="1.0"/>',
+    "            </Color>",
+    "          </ColorStop>",
+    '          <ColorStop index="1">',
+    '            <StopOffset value="1.0"/>',
+    "            <Color>",
+    '              <PaletteIndex value="5"/>',
+    '              <Alpha value="1.0"/>',
+    "            </Color>",
+    "          </ColorStop>",
+    "        </ColorLine>",
+    '        <centerX value="259"/>',
+    '        <centerY value="300"/>',
+    '        <startAngle value="45.0"/>',
+    '        <endAngle value="135.0"/>',
+    "      </Paint>",
+    '      <Glyph value="glyph00011"/>',
+    "    </Paint>",
+    "  </BaseGlyphV1Record>",
     "</BaseGlyphV1List>",
     "<LayerV1List>",
     "  <!-- LayerCount=4 -->",