How can I test that a value is "greater than or equal to" in Jasmine?

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I want to confirm that a value is a decimal (or 0), so the number should be greater than or equal to zero and less than 1.


  it('should be a decimal', function() {

    var percent = insights.percent; 



How do I mimic " >= 0 "?

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You just need to run the comparison operation first, and then check if it's truthy.

  it('should be a decimal',function(){

    var percent = insights.percent;

    expect(percent >= 0).toBeTruthy();


What is a test statistic? - Minitab Express, Learn how to compare a P-value to a significance level to make a conclusion in a significance Duration: 7:58 Posted: Feb 24, 2018 Divide the variance of each set of data by the number of values. Add the two resulting numbers together. Calculate the square root of the number you found in the above step. Take the number you got when you subtracted the two means and divide it by the square root you found in the above step. This is your T value.

The current version of Jasmine supports toBeGreaterThan and toBeLessThan.


Manually calculate a p-value - Minitab, after finding the t value to be equal to -2.5, how do we find the p-value (i.e. probability of Duration: 5:02 Posted: Feb 24, 2018 Re: How do I - Logical Test: If a cell's value is not a numb Try =IF(ISERROR(your formula),"") Nimo

Somewhat strangley this isn't basic functionality

You can add a custom matcher like this:


yourGlobal.addExtraMatchers = function () {
    var addMatcher = function (name, func) { = name;
        jasmine.matchers[name] = func;

    addMatcher("toBeGreaterThanOrEqualTo", function () {
                   return {
                       compare: function (actual, expected) {
                           return {
                               pass: actual >= expected

In effect you're defining a constructor for your matcher - it's a function that returns a matcher object.

Include that before you 'boot'. The basic matchers are loaded at boot time.

Your html file should look like this:

<!-- jasmine test framework-->
<script type="text/javascript" src="lib/jasmine-2.0.0/jasmine.js"></script>
<script type="text/javascript" src="lib/jasmine-2.0.0/jasmine-html.js"></script>

<!-- custom matchers -->
<script type="text/javascript" src="Tests/JasmineExtensions.js"></script>
<!-- initialisation-->
<script type="text/javascript" src="lib/jasmine-2.0.0/boot.js"></script>

Then in your boot.js add the call to add the matchers after jasmine has been defined but before jasmine.getEnv(). Get env is actually a (slightly misleadingly named) setup call.

The matchers get setup in the call to setupCoreMatchers in the Env constructor.

 * ## Require &amp; Instantiate
 * Require Jasmine's core files. Specifically, this requires and attaches all of Jasmine's code to the `jasmine` reference.
window.jasmine = jasmineRequire.core(jasmineRequire);

 * Since this is being run in a browser and the results should populate to an HTML page, require the HTML-specific Jasmine code, injecting the same reference.

 * Create the Jasmine environment. This is used to run all specs in a project.
var env = jasmine.getEnv();

They show another way of adding custom matchers in the sample tests, however the way it works is to recreate the matcher(s) before every single test using a beforeEach. That seems pretty horrible so I thought I'd go with this approach instead.

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I'm late to this but posting it just in case some one still visits this question looking for answers, I'm using Jasmine version 3.0 and as mentioned by @Patrizio Rullo you can use toBeGreaterThanOrEqual/toBeLessThanOrEqual.

It was added in version 2.5 as per release notes -

For e.g.

expect(percent).toBeGreaterThanOrEqual(1,"This is optional expect failure message");



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