Add asymmetric equality tester to match a string against a regexp

- Also move the asymmetric testers into their own dir for easier
  locating.

[#58120558] Fix #243

src/core/asymmetric_equality/ObjectContaining.js

@@ -0,0 +1,25 @@
+getJasmineRequireObj().ObjectContaining = function(j$) {
+
+  function ObjectContaining(sample) {
+    this.sample = sample;
+  }
+
+  ObjectContaining.prototype.asymmetricMatch = function(other) {
+    if (typeof(this.sample) !== 'object') { throw new Error('You must provide an object to objectContaining, not \''+this.sample+'\'.'); }
+
+    for (var property in this.sample) {
+      if (!Object.prototype.hasOwnProperty.call(other, property) ||
+          !j$.matchersUtil.equals(this.sample[property], other[property])) {
+        return false;
+      }
+    }
+
+    return true;
+  };
+
+  ObjectContaining.prototype.jasmineToString = function() {
+    return '<jasmine.objectContaining(' + j$.pp(this.sample) + ')>';
+  };
+
+  return ObjectContaining;
+};