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easejs/test/test-interface-name.js

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JavaScript

/**
* Tests interface naming
*
* Copyright (C) 2010 Mike Gerwitz
*
* This file is part of ease.js.
*
* ease.js is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @author Mike Gerwitz
* @package test
*/
var common = require( './common' ),
assert = require( 'assert' ),
Interface = common.require( 'interface' ),
util = common.require( 'util' )
;
/**
* Interfaces may be named by passing the name as the first argument to the
* module
*/
( function testInterfaceAcceptsName()
{
assert.doesNotThrow( function()
{
var iface = Interface( 'Foo', {} );
assert.equal(
Interface.isInterface( iface ),
true,
"Interface defined with name is returned as a valid interface"
);
}, Error, "Interface accepts name" );
} )();
/**
* The interface definition, which equates to the body of the interface, must be
* an object
*/
( function testNamedInterfaceDefinitionRequiresThatDefinitionBeAnObject()
{
var name = 'Foo';
try
{
Interface( name, 'Bar' );
// if all goes well, we'll never get to this point
assert.fail(
"Second argument to named interface must be the definition"
);
}
catch ( e )
{
assert.notEqual(
e.message.match( name ),
null,
"Interface definition argument count error string contains " +
"interface name"
);
}
} )();
/**
* Extraneous arguments likely indicate a misunderstanding of the API
*/
( function testNamedInterfaceDefinitionIsStrictOnArgumentCount()
{
var name = 'Foo',
args = [ name, {}, 'extra' ]
;
// we should be permitted only two arguments
try
{
Interface.apply( null, args );
// we should not get to this line (an exception should be thrown due to
// too many arguments)
assert.fail(
"Should accept only two arguments when creating named interface"
);
}
catch ( e )
{
var errstr = e.message;
assert.notEqual(
errstr.match( name ),
null,
"Named interface error should provide interface name"
);
assert.notEqual(
errstr.match( args.length + ' given' ),
null,
"Named interface error should provide number of given arguments"
);
}
} )();
/**
* By default, anonymous interfacees should simply state that they are a
* interface when they are converted to a string
*/
( function testConvertingAnonymousInterfaceToStringYieldsInterfaceString()
{
assert.equal(
Interface( {} ).toString(),
'[object Interface]',
"Converting anonymous interface to string yields interface string"
);
} )();
/**
* If the interface is named, then the name should be presented when it is
* converted to a string
*/
( function testConvertingNamedInterfaceToStringYieldsInterfaceStringContainingName()
{
var name = 'Foo';
assert.equal(
Interface( name, {} ).toString(),
'[object Interface <' + name + '>]',
"Converting named interface to string yields string with name of " +
"interface"
);
} )();
( function testDeclarationErrorsProvideInterfaceNameIsAvailable()
{
var name = 'Foo',
// functions used to cause the various errors
tries = [
// properties
function()
{
Interface( name, { prop: 'str' } );
},
// methods
function()
{
Interface( name, { method: function() {} } );
},
]
;
// if we have getter/setter support, add those to the tests
if ( !( util.definePropertyFallback() ) )
{
// getter
tries.push( function()
{
var obj = {};
Object.defineProperty( obj, 'getter', {
get: function() {},
enumerable: true,
} );
Interface( name, obj );
} );
// setter
tries.push( function()
{
var obj = {};
Object.defineProperty( obj, 'setter', {
set: function() {},
enumerable: true,
} );
Interface( name, obj );
} );
}
// gather the error strings
var i = tries.length;
while ( i-- )
{
try
{
// cause the error
tries[ i ]();
}
catch ( e )
{
// ensure the error string contains the interface name
assert.notEqual(
e.message.match( name ),
null,
"Error contains interface name when available (" + i + ")"
);
return;
}
// we shouldn't get to this point...
assert.fail( "Expected error. Something's wrong: " + i );
}
} )();
( function testInterfaceNameIsIncludedInInstantiationError()
{
var name = 'Foo';
try
{
// this should throw an exception (cannot instantiate interfaces)
Interface( name )();
// we should never get here
assert.fail( "Exception expected. There's a bug somewhere." );
}
catch ( e )
{
assert.notEqual(
e.message.match( name ),
null,
"Interface name is included in instantiation error message"
);
}
} )();