Index: test/mjsunit/harmony/math-expm1.js |
diff --git a/test/mjsunit/harmony/math-expm1.js b/test/mjsunit/harmony/math-expm1.js |
new file mode 100644 |
index 0000000000000000000000000000000000000000..de915c0969eb495f4d87142a339b85ecf1e275c7 |
--- /dev/null |
+++ b/test/mjsunit/harmony/math-expm1.js |
@@ -0,0 +1,38 @@ |
+// Copyright 2014 the V8 project authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+// Flags: --harmony-maths --no-fast-math |
+ |
+assertTrue(isNaN(Math.expm1(NaN))); |
+assertTrue(isNaN(Math.expm1(function() {}))); |
+assertTrue(isNaN(Math.expm1({ toString: function() { return NaN; } }))); |
+assertTrue(isNaN(Math.expm1({ valueOf: function() { return "abc"; } }))); |
+assertEquals("Infinity", String(1/Math.expm1(0))); |
+assertEquals("-Infinity", String(1/Math.expm1(-0))); |
+assertEquals("Infinity", String(Math.expm1(Infinity))); |
+assertEquals(-1, Math.expm1(-Infinity)); |
+ |
+for (var x = 0.1; x < 700; x += 0.1) { |
+ var expected = Math.exp(x) - 1; |
+ assertEqualsDelta(expected, Math.expm1(x), expected * 1E-14); |
+ expected = Math.exp(-x) - 1; |
+ assertEqualsDelta(expected, Math.expm1(-x), -expected * 1E-14); |
+} |
+ |
+// Values close to 0: |
+// Use six terms of Taylor expansion at 0 for exp(x) as test expectation: |
+// exp(x) - 1 == exp(0) + exp(0) * x + x * x / 2 + ... - 1 |
+// == x + x * x / 2 + x * x * x / 6 + ... |
+function expm1(x) { |
+ return x * (1 + x * (1/2 + x * ( |
+ 1/6 + x * (1/24 + x * ( |
+ 1/120 + x * (1/720 + x * ( |
+ 1/5040 + x * (1/40320 + x*( |
+ 1/362880 + x * (1/3628800)))))))))); |
+} |
+ |
+for (var x = 1E-1; x > 1E-300; x *= 0.8) { |
+ var expected = expm1(x); |
+ assertEqualsDelta(expected, Math.expm1(x), expected * 1E-14); |
+} |