Added a stringContaining asymmetric equality tester

* Fixes #1923.

src/core/asymmetric_equality/StringContaining.js

@@ -0,0 +1,24 @@
+getJasmineRequireObj().StringContaining = function(j$) {
+  function StringContaining(expected) {
+    if (!j$.isString_(expected)) {
+      throw new Error('Expected is not a String');
+    }
+
+    this.expected = expected;
+  }
+
+  StringContaining.prototype.asymmetricMatch = function(other) {
+    if (!j$.isString_(other)) {
+      // Arrays, etc. don't match no matter what their indexOf returns.
+      return false;
+    }
+
+    return other.indexOf(this.expected) !== -1;
+  };
+
+  StringContaining.prototype.jasmineToString = function() {
+    return '<jasmine.stringContaining("' + this.expected + '")>';
+  };
+
+  return StringContaining;
+};

src/core/base.js

@@ -319,6 +319,17 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
     return new j$.StringMatching(expected);
   };
 
+  /**
+   * Get a matcher, usable in any {@link matchers|matcher} that uses Jasmine's equality (e.g. {@link matchers#toEqual|toEqual}, {@link matchers#toContain|toContain}, or {@link matchers#toHaveBeenCalledWith|toHaveBeenCalledWith}),
+   * that will succeed if the actual value is a `String` that contains the specified `String`.
+   * @name jasmine.stringContaining
+   * @function
+   * @param {String} expected
+   */
+  j$.stringContaining = function(expected) {
+    return new j$.StringContaining(expected);
+  };
+
   /**
    * Get a matcher, usable in any {@link matchers|matcher} that uses Jasmine's equality (e.g. {@link matchers#toEqual|toEqual}, {@link matchers#toContain|toContain}, or {@link matchers#toHaveBeenCalledWith|toHaveBeenCalledWith}),
    * that will succeed if the actual value is an `Array` that contains at least the elements in the sample.

src/core/requireCore.js

@@ -74,6 +74,7 @@ var getJasmineRequireObj = (function(jasmineGlobal) {
     j$.SpyRegistry = jRequire.SpyRegistry(j$);
     j$.SpyStrategy = jRequire.SpyStrategy(j$);
     j$.StringMatching = jRequire.StringMatching(j$);
+    j$.StringContaining = jRequire.StringContaining(j$);
     j$.UserContext = jRequire.UserContext(j$);
     j$.Suite = jRequire.Suite(j$);
     j$.Timer = jRequire.Timer();