Styjun

When I run a Jasmine or QUnit test on a JavaScript function (in a C# ASP.Net project) that uses the array.includes() method (called on an instance of the array), I get an error message: 'Undefined is not a constructor when evaluating arrayName.includes(dataToFind)'. I am using Chutzpah test runner to run the tests inside of Visual Studio Explorer. When I write the routine for the array includes method rather than rely on this abstraction, it works, so it seems to not like this method or know where its implementation is. I would prefer to use this method as I have read it is best practice to use it (for modern web browsers).

I have a work around for it in writing the includes routine myself, and I have looked to see if I need to include a reference to the array class (as this is likely an extension method maybe?), but I cant find how you would do this. It might also be a dependency that needs registering (although I am new to Jasmine / QUnit so don't know where this would go). I have updated compile settings for Jasmine in chutzpah.json settings file.

//Jasmine nor QUnit like this
function randomArrayOfIndexes() {
 var randNumbArray = new Array(4);
 var indexToAssign = Math.floor(Math.random() * Math.floor(4));
 randNumbArray[0] = indexToAssign;

 for (i = 1; i < randNumbArray.length; i++) 
 indexToAssign = Math.floor(Math.random() * Math.floor(4));
 //while (arrayContains(randNumbArray, indexToAssign)) 
 while (randNumbArray.includes(indexToAssign)) 
 indexToAssign = Math.floor(Math.random() * Math.floor(4));
 
 randNumbArray[i] = indexToAssign;
 

 return randNumbArray;


//Jasmine and QUnit do like this

unction randomArrayOfIndexes() {
 var randNumbArray = new Array(4);
 var indexToAssign = Math.floor(Math.random() * Math.floor(4));
 randNumbArray[0] = indexToAssign;

 for (i = 1; i < randNumbArray.length; i++) 
 indexToAssign = Math.floor(Math.random() * Math.floor(4));
 while (arrayContains(randNumbArray, indexToAssign)) 
 //while (randNumbArray.includes(indexToAssign)) 
 indexToAssign = Math.floor(Math.random() * Math.floor(4));
 
 randNumbArray[i] = indexToAssign;
 

 return randNumbArray;


// includes function I made myself
function arrayContains(arrayin, numberIn) 
 var i = arrayin.length;
 while (i--) //takes one from i so highest index is accurate on first iteration
 if (arrayin[i] === numberIn) 
 return true;
 
 
 return false;

I would expect this routine to run within the test environment without having to write the method myself. I get the error: Undefined is not a constructor when evaluating arrayName.includes(dataToFind)'.