Added infinity methods, with tests

src/core/matchers/toBeNegativeInfinity.js

@@ -0,0 +1,28 @@
+getJasmineRequireObj().toBeNegativeInfinity = function(j$) {
+  /**
+   * {@link expect} the actual value to be `-Infinity` (-infinity).
+   * @function
+   * @name matchers#toBeNegativeInfinity
+   * @example
+   * expect(thing).toBeNegativeInfinity();
+   */
+  function toBeNegativeInfinity() {
+    return {
+      compare: function(actual) {
+        var result = {
+          pass: (actual === Number.NEGATIVE_INFINITY)
+        };
+
+        if (result.pass) {
+          result.message = 'Expected actual to be -Infinity.';
+        } else {
+          result.message = function() { return 'Expected ' + j$.pp(actual) + ' not to be -Infinity.'; };
+        }
+
+        return result;
+      }
+    };
+  }
+
+  return toBeNegativeInfinity;
+};