assertion
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1.3.35 • Public • Published

Assertion Library for Browsers and NodeJS

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Based on the API Interface of the NodeJS Assert module. And is part of the uTest Library.

As a standalone module can be found in NPM repository

npm install assertion
API
NodeJS API
  • Assert Documentation

    assert
     
        equal
        notEqual
        deepEqual
        notDeepEqual
        strictEqual
        notStrictEqual
        throws
        doesNotThrow
        ifError
Additional API
  • has / hasNot

    Subset matching

    // Substring search
    assert.has(String, String | RegExp, ?message);
     
    // Simple property existence check
    assert.has(Object, String);
     
    // Sub-object match
    assert.has(Object, Object);
     
    // Check if item exists in set
    assert.has(Array, Primitive);
     
    // Subset match
    assert.has(Array, Array);

    When checking arrays or objects, deep matching is performed. See tests

     
    assert.has({
        foo: 'foo',
        bar: {
            qux: {
                qux: 'qux'
                quux: 'quux'
            },
            baz: [1, 2, 3]
        }
    }, {
        foo: null,
        bar: {
            baz: [1],
            qux: {
                qux: 'qux'
            }
        }
    });
     
  • is/isNot

    Type check

        // Check by Typename
        assert.is(Any, String, ?message)
        
        // Check by Contructor (instanceof)
        assert.is(Any, Function);

    Typename is extracted from Object.prototype.toString.call, so these are:

        'String'
        'Number'
        'Null'
        'Undefined'
        'Function'
        'RegExp'
        'Date'
        'Object' // any `object` will pass here
        'HTML**' // DOM Node, e.g. HTMLBodyElement
        'CustomEvent'
        ...
        all other built-in types
  • lessThan lessThanOrEqaul greaterThan greaterThanOrEqual

    Compares two digits

  • Aliases

    There are also aliases (which can be set to globals, to simplify the write-read of tests)

    assert.eq_      === assert.equal
    assert.notEq_   === assert.notEqual
     
    assert.lt_      === assert.lessThan
    assert.lte_     === assert.lessThanOrEqaul
    assert.gt_      === assert.greaterThan
    assert.gt_      === assert.greaterThanOrEqual
     
    assert.deepEq_  === assert.deepEqual
    assert.notDeepEq_  === assert.notDeepEqual
  • jQuery

    jQuery Assertion Extensions (alias name syntax)

        $.fn.eq_
        $.fn.notEq_
        $.fn.deepEq_
        $.fn.notDeepEq_
        $.fn.has_
        $.fn.hasNot_
        $.fn.lt_
        $.fn.lte_
        $.fn.gt_
        $.fn.gte_

    Functions API:

    • Get Property
      • (Key, Expected)
      • ([Key, Expected], message)
    • Function call
      • (FnName [, ...arguments], Expected)
      • ([FnName [, ...arguments], Expected], message)

    has/hasNot

    • Node Find/Filter Assertions
      • (Selector, ?ExpectedCount)

    Example:

    // <div class='container' id='foo'>
    // <h4>Baz</h4>
    // <span>Qux</span>
    // </div>
     
    $('.container')
        .eq_('length', 1)
        .eq_('attr', 'id', 'foo')
        .eq_('hasClass', 'container', true)
        
        .children()
        .eq_('length', 2)
        .has_('html', 'span')
        
        .filter('h4')
        .eq_('length', 1)
        .eq_('text', 'Baz')
        
        // addition sample
        .is_('visible'),
        .is_('hidden')
        .eq_('css', 'border-left-width', '2px')
        ;
        
    $('.container')
        .has_('h4')
        .hasNot_('h1')
        ;
  • Assert callbacks calls

    • await

      Wait for a callback

      Creates a wrapper function to ensure that the function is called.

          // ! Arguments order does not matter
          var fn = assert.await(
              String   /* optional - name of this wrapper*/
              Function /* optional - wrap the function*/,
              Object   /* optional - use binded context*/,
              Number   /* optional - expectation count, default is `1`*/
          );
          
          // creates item in assert.callbacks
          [
              {
                  name: String,
                  error: Error, // to receive the stack trace
                  count: Number
              }
          ];
          
          // after the `fn` function is called `count` times, then the object is removed
          // from the callbacks set
          
          
          // Example
          var fn = assert.await();
          assert.callbacks.length === 1;
          try {
              throw new Error()
          } catch {
              fn();
          }
          
          assert.callbacks.length === 0;
          
    • avoid

      Unexpect more then N function calls

      // ! Arguments order does not matter
      var fn = assert.avoid(
          String   /* optional - name of this wrapper*/
          Function /* optional - wrap the function*/,
          Object   /* optional - use binded context*/,
          Number   /* optional - amount of allowed calls, default is `0`*/
      );
       
      fooDfr()
          .fail(assert.avoid())
          .done(function(){
              // ..
          })
          
       
  • Listener

    You can attach listener to the assertions. Event Types:

    • start
    • fail

      if fail type listener is attached, then exceptions are not thrown.

    • success
    // sample
    assert.on('fail', function(error){
        error instanceof assert.AssertionError;
    });

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