1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Math/log1p-exact.js b/js/src/tests/ecma_6/Math/log1p-exact.js
new file mode 100644
index 000000000..bec11b659
--- /dev/null
+++ b/js/src/tests/ecma_6/Math/log1p-exact.js
@@ -0,0 +1,29 @@
+// Properties of Math.log1p that are guaranteed by the spec.
+
+// If x is NaN, the result is NaN.
+assertEq(Math.log1p(NaN), NaN);
+
+// If x is less than -1, the result is NaN.
+assertEq(Math.log1p(-1 - 1e-10), NaN);
+assertEq(Math.log1p(-1 - 1e-5), NaN);
+assertEq(Math.log1p(-1 - 1e-1), NaN);
+assertEq(Math.log1p(-ONE_PLUS_EPSILON), NaN);
+
+for (var i = -2; i > -20; i--)
+    assertEq(Math.log1p(i), NaN);
+
+// If x is -1, the result is -∞.
+assertEq(Math.log1p(-1), -Infinity);
+
+// If x is +0, the result is +0.
+assertEq(Math.log1p(+0), +0);
+
+// If x is −0, the result is −0.
+assertEq(Math.log1p(-0), -0);
+
+// If x is +∞, the result is +∞.
+assertEq(Math.log1p(Infinity), Infinity);
+
+
+reportCompare(0, 0, "ok");
+