1 files changed, 53 insertions, 0 deletions
diff --git a/toolkit/modules/tests/xpcshell/test_Color.js b/toolkit/modules/tests/xpcshell/test_Color.js
new file mode 100644
index 000000000..9bf9bf861
--- /dev/null
+++ b/toolkit/modules/tests/xpcshell/test_Color.js
@@ -0,0 +1,53 @@
+"use strict";
+
+Components.utils.import("resource://gre/modules/Color.jsm");
+
+function run_test() {
+  testRelativeLuminance();
+  testIsBright();
+  testContrastRatio();
+  testIsContrastRatioAcceptable();
+}
+
+function testRelativeLuminance() {
+  let c = new Color(0, 0, 0);
+  Assert.equal(c.relativeLuminance, 0, "Black is not illuminating");
+
+  c = new Color(255, 255, 255);
+  Assert.equal(c.relativeLuminance, 1, "White is quite the luminant one");
+
+  c = new Color(142, 42, 142);
+  Assert.equal(c.relativeLuminance, 0.25263952353998204,
+    "This purple is not that luminant");
+}
+
+function testIsBright() {
+  let c = new Color(0, 0, 0);
+  Assert.equal(c.isBright, 0, "Black is bright");
+
+  c = new Color(255, 255, 255);
+  Assert.equal(c.isBright, 1, "White is bright");
+}
+
+function testContrastRatio() {
+  let c = new Color(0, 0, 0);
+  let c2 = new Color(255, 255, 255);
+  Assert.equal(c.contrastRatio(c2), 21, "Contrast between black and white is max");
+  Assert.equal(c.contrastRatio(c), 1, "Contrast between equals is min");
+
+  let c3 = new Color(142, 42, 142);
+  Assert.equal(c.contrastRatio(c3), 6.05279047079964, "Contrast between black and purple");
+  Assert.equal(c2.contrastRatio(c3), 3.469474137806338, "Contrast between white and purple");
+}
+
+function testIsContrastRatioAcceptable() {
+  // Let's assert what browser.js is doing for window frames.
+  let c = new Color(...[55, 156, 152]);
+  let c2 = new Color(0, 0, 0);
+  Assert.equal(c.r, 55, "Reds should match");
+  Assert.equal(c.g, 156, "Greens should match");
+  Assert.equal(c.b, 152, "Blues should match");
+  Assert.ok(c.isContrastRatioAcceptable(c2), "The blue is high contrast enough");
+  c = new Color(...[35, 65, 100]);
+  Assert.ok(!c.isContrastRatioAcceptable(c2), "The blue is not high contrast enough");
+}