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hasFunction( )

Check if a context has a function property, optionally with specified number of formal parameters...

 

Syntax

hasFunction( context, key[, paramCount] );

Parameters

ParameterTypeMandatoryNotesAPI Version
contextVariant(tick)The object to which the function is attached.1.5
keyString(tick)The name of the property that should be a function.1.5
paramCountNumber(error)

The number of formally defined parameters the function should have.

Default: Don't check parameter count.

Note: JS API functions don't specify any formal parameters (sad)

1.5

Return Values

ValueTypeNotesAPI Version
<error>ErrorMost likely the parameters are wrong.1.0
trueBooleanThe assertion passed.1.0
falseBooleanThe assertion failed.1.0

Notes

The assertion is performed in three stages:

  • Assert that the property 'key' exists
  • Assert that the value of the property is a function
  • If paramCount specified, assert the number of formal parameters matches paramCount

The message added to the test results indicates indicates which stage hasFunction( ) had got to when the assertion passed or failed.

Example

// let's say we're testing this...
var foo = {
	bar: function(a, b, c) {},
	chimp: "not a function"
}
 
Test("foo.bar() defined", Test.ANY( ), function() {
	hasFunction( foo, "meh" ); // fails - no property called "meh"
	hasFunction( foo, "bar" ); // passes
	hasFunction( foo, "chimp" ); // fails - chimp is not a function
	hasFunction( foo, "bar", 3 ); // passes
	hasFunction( foo, "bar", 4 ); // fails - bar() has 3 formal params
});
Availability STABLE

Requires:

Contents

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Test API

Topics:

  • Test()Define a unit test and it's configuration...
  • Test ModulesA test module groups one or more unit tests and provides additional lifecycle settings for those tests...
  • Test ModesDefines the mode in which a unit test is run...
    • Test.ANY( )The most basic unit test mode...
    • Test.EXPECT( )Causes the test to fail if it does not generate the specified number of results...
    • Test.ASYNCH( )Causes a test to keep running until it either passes, fails or times-out...
    • Test.APPEND( )Appends results to a specific asynchronous test session...
  • Unit TestsThe unit test function, responsible for performing one or more Test Assertions...
  • Test AssertionsAssertions are used to perform various tests and annotations within a unit test...
    • comment( )Adds a comment to the test results...
    • ok( )A simple state checking assertion...
    • hasNative( )Assert presence of a native property on the global object...
    • hasFunction( )Check if a context has a function property, optionally with specified number of formal parameters...
    • equal( )A basic equality checking assertion...
    • notEqual( )A basic inequality checking assertion...
    • strictEqual( )A strict equality checking assertion...
    • notStrictEqual( )A strict inequality checking assertion...
    • deepEqual( )A deep equality checking assertion...
    • notDeepEqual( )A deep inequality checking assertion...
    • similarTo( )A deep similarity checking assertion...
    • notSimilarTo( )A deep dissimilarity spotting assertion...
  • Test SignalsSignals are used to prematurely terminate Unit Tests...
    • REQUIRE( )Check whether a test or group of tests have passed. If the requirement fails, a RequireSignal will be sent which terminates the current test and marks it as failed.
    • ABORT( )Aborts the current test, marking it as failed in the process...
    • FINISH( )Terminates the test as if it had finished normally...
  • Test EventsEvents defined by Test API...
  • Test ResultsAfter testing is finished, output results...
  • Test API - Dev NotesDeveloper notes for this API...