Expose Jasmine's topSuite [finishes #59774024]

spec/core/EnvSpec.js

@@ -92,6 +92,12 @@ describe("Env", function() {
     });
   });
 
+  describe("#topSuite", function() {
+    it("returns the Jasmine top suite for users to traverse the spec tree", function() {
+      var suite = env.topSuite();
+      expect(suite.description).toEqual('Jasmine__TopLevel__Suite');
+    });
+  });
 });
 
 // TODO: move these into a separate file

src/core/Env.js

@@ -150,6 +150,10 @@ getJasmineRequireObj().Env = function(j$) {
     runnableLookupTable[topSuite.id] = topSuite;
     currentSuite = topSuite;
 
+    this.topSuite = function() {
+      return topSuite;
+    };
+
     this.execute = function(runnablesToRun) {
       runnablesToRun = runnablesToRun || [topSuite.id];