add tests for buildCORL and buildCPAL

Tests/colorLib/builder_test.py

@@ -0,0 +1,56 @@
+from fontTools.colorLib import builder
+from fontTools.colorLib.errors import ColorLibError
+import pytest
+
+
+def test_buildCOLR_v0():
+    color_layer_lists = {
+        "a": [("a.color0", 0), ("a.color1", 1)],
+        "b": [("b.color1", 1), ("b.color0", 0)],
+    }
+
+    colr = builder.buildCOLR(color_layer_lists)
+
+    assert colr.tableTag == "COLR"
+    assert colr.version == 0
+    assert colr.ColorLayers["a"][0].name == "a.color0"
+    assert colr.ColorLayers["a"][0].colorID == 0
+    assert colr.ColorLayers["a"][1].name == "a.color1"
+    assert colr.ColorLayers["a"][1].colorID == 1
+    assert colr.ColorLayers["b"][0].name == "b.color1"
+    assert colr.ColorLayers["b"][0].colorID == 1
+    assert colr.ColorLayers["b"][1].name == "b.color0"
+    assert colr.ColorLayers["b"][1].colorID == 0
+
+
+def test_buildCPAL_v0():
+    palettes = [
+        [(0.68, 0.20, 0.32, 1.0), (0.45, 0.68, 0.21, 1.0)],
+        [(0.68, 0.20, 0.32, 0.6), (0.45, 0.68, 0.21, 0.6)],
+        [(0.68, 0.20, 0.32, 0.3), (0.45, 0.68, 0.21, 0.3)],
+    ]
+
+    cpal = builder.buildCPAL(palettes)
+
+    assert cpal.tableTag == "CPAL"
+    assert cpal.version == 0
+    assert cpal.numPaletteEntries == 2
+
+    assert len(cpal.palettes) == 3
+    assert [tuple(c) for c in cpal.palettes[0]] == [
+        (82, 51, 173, 255),
+        (54, 173, 115, 255),
+    ]
+    assert [tuple(c) for c in cpal.palettes[1]] == [
+        (82, 51, 173, 153),
+        (54, 173, 115, 153),
+    ]
+    assert [tuple(c) for c in cpal.palettes[2]] == [
+        (82, 51, 173, 76),
+        (54, 173, 115, 76),
+    ]
+
+
+def test_buildCPAL_palettes_different_lengths():
+    with pytest.raises(ColorLibError, match="have different lengths"):
+        builder.buildCPAL([[(1, 1, 1, 1)], [(0, 0, 0, 1), (0.5, 0.5, 0.5, 1)]])