Add tests for the behavior of INT32_MIN (-2147483648) as exponent with the exponentiation operator and with Math.pow (which shares the same core algorithm in the spec, but might be differently implemented in actual implementations). (#1445)

test/built-ins/Math/pow/int32_min-exponent.js

@@ -0,0 +1,17 @@
+// Copyright (C) 2018 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-applying-the-exp-operator
+description: >
+    Using -(2**31) as exponent with Math.pow should behave as expected.
+---*/
+
+const INT32_MIN = -2147483648;
+
+assert.sameValue(Math.pow(2, INT32_MIN), +0.0,
+                 "Math.pow(2, -(gonzo huge exponent > 1074)) should be +0 " +
+                 "because 2**-1074 is the smallest positive IEEE-754 number");
+
+assert.sameValue(Math.pow(1, INT32_MIN), 1,
+                 "1**-(gonzo huge exponent > 1074) should be 1");

test/language/expressions/exponentiation/int32_min-exponent.js

@@ -0,0 +1,18 @@
+// Copyright (C) 2018 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-applying-the-exp-operator
+description: >
+    Using -(2**31) as exponent with the exponentiation operator should behave
+    as expected.
+---*/
+
+const INT32_MIN = -2147483648;
+
+assert.sameValue(2**INT32_MIN, +0.0,
+                 "2**-(gonzo huge exponent > 1074) should be +0 because " +
+                 "2**-1074 is the smallest positive IEEE-754 number");
+
+assert.sameValue(1**INT32_MIN, 1,
+                 "1**-(gonzo huge exponent > 1074) should be 1");