Deprecate describes with no children

spec/core/EnvSpec.js

@@ -141,11 +141,24 @@ describe('Env', function() {
       );
 
       expect(function() {
-        env.describe('fn arg', function() {});
+        env.describe('fn arg', function() {
+          env.it('has a spec', function() {});
+        });
       }).not.toThrowError(
         'describe expects a function argument; received [object Function]'
       );
     });
+
+    it('logs a deprecation when it has no children', function() {
+      spyOn(env, 'deprecated');
+      env.describe('no children', function() {});
+      expect(env.deprecated).toHaveBeenCalledWith(
+        'describe with no children' +
+          ' (describe() or it()) is deprecated and will be removed in a future ' +
+          'version of Jasmine. Please either remove the describe or add ' +
+          'children to it.'
+      );
+    });
   });
 
   describe('#it', function() {

spec/core/ExceptionsSpec.js

@@ -34,7 +34,11 @@ describe('Exceptions:', function() {
   });
 
   it('should handle exceptions thrown directly in top-level describe blocks and continue', function(done) {
-    var secondDescribe = jasmine.createSpy('second describe');
+    var secondDescribe = jasmine
+      .createSpy('second describe')
+      .and.callFake(function() {
+        env.it('has a test', function() {});
+      });
     env.describe('a suite that throws an exception', function() {
       env.it('is a test that should pass', function() {
         this.expect(true).toEqual(true);

spec/core/integration/EnvSpec.js

@@ -1863,6 +1863,7 @@ describe("Env integration", function() {
       } catch(e) {
         exception = e;
       }
+      env.it('has a test', function() {});
     });
 
     var assertions = function() {
@@ -1885,6 +1886,7 @@ describe("Env integration", function() {
       } catch(e) {
         exception = e;
       }
+      env.it('has a test', function() {});
     });
 
     var assertions = function() {
@@ -1907,6 +1909,7 @@ describe("Env integration", function() {
       } catch(e) {
         exception = e;
       }
+      env.it('has a test', function() {});
     });
 
     var assertions = function() {