container.test.js
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container.test.js
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	import createContainer from '../../src/container';

	QUnit.module( 'container', {
	beforeEach() {
	this.container = createContainer();
	this.factory = this.sandbox.stub();
	}
	} );

	QUnit.test( '#has', function ( assert ) {
	this.container.set( 'foo', this.factory );

	assert.true( this.container.has( 'foo' ), 'The container checks the factory.' );
	} );

	QUnit.test( '#get', function ( assert ) {
	const service = {};

	this.factory.returns( service );

	this.container.set( 'foo', this.factory );

	assert.strictEqual( service, this.container.get( 'foo' ) );
	assert.strictEqual(
	this.container,
	this.factory.getCall( 0 ).args[ 0 ],
	'The container uses the factory.'
	);

	// ---

	this.container.get( 'foo' );

	assert.true(
	this.factory.calledOnce,
	'It should memoize the result of the factory.'
	);

	// ---

	assert.throws(
	() => {
	this.container.get( 'bar' );
	},
	/The service "bar" hasn't been defined./,
	'The container throws an error when no factory exists.'
	);
	} );

	QUnit.test( '#get should handle values, not just functions', function ( assert ) {
	this.container.set( 'foo', 'bar' );

	assert.strictEqual(
	this.container.get( 'foo' ),
	'bar',
	'The container understands string values.'
	);
	} );