Added infinity methods, with tests

src/core/matchers/toBePositiveInfinity.js

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