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-rw-r--r--js/src/tests/ecma_6/Math/log2-approx.js8
1 files changed, 8 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Math/log2-approx.js b/js/src/tests/ecma_6/Math/log2-approx.js
new file mode 100644
index 000000000..954f4c1cf
--- /dev/null
+++ b/js/src/tests/ecma_6/Math/log2-approx.js
@@ -0,0 +1,8 @@
+for (var i = -1074; i < 1023; i++)
+ assertNear(Math.log2(Math.pow(2, i)), i);
+
+assertNear(Math.log2(5), 2.321928094887362);
+assertNear(Math.log2(7), 2.807354922057604);
+assertNear(Math.log2(Math.E), Math.LOG2E);
+
+reportCompare(0, 0, "ok");