Merge pull request #98 from danscotton/patch-1

Update assertions.md

book/design/assertions.md

@@ -52,15 +52,15 @@ items => expect(items).to.eventually.include.('some item of interest');
 could be made configurable:
 
 ```typescript
-expected => actual => expect(items).to.eventually.include(expected);
+expected => actual => expect(actual).to.eventually.include(expected);
 ```
 
 We could also give the above function a name, and store it in our project as, say `assertions.ts`, so that
 it can be reused in other scenarios:
 
 ```typescript
 // assertions.ts
-export include = expected => actual => expect(items).to.eventually.include(expected);
+export include = expected => actual => expect(actual).to.eventually.include(expected);
 ```  
 
 With this one-liner in place, we could improve the task definition from the previous example: