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PHPunit | AssertContainsOnlyInstancesOf () Function

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Syntax:
assertContainsOnlyInstancesOf (string $classname, array $array, string $message = ’’) 
Parameters: This function takes three parameters as shown in the above syntax. The parameters are described below:
  • $classname: this parameter is a string that is the class name.
  • $array: This parameter is an array for which the assert function will check whether it contains only instances of the given class or not.
  • $message: this parameter takes a string value. When the test case failed, this string message was displayed as an error message.
The following programs illustrate the assertContainsOnlyInstancesOf() function in PHPUnit: Program 1:   use PHPUnitFrameworkTestCase; class Foo { public function dummyFunction() { return true;} } class Bar { public function dummyFunction() { return true;} } class GeeksPhpunitTestCase extends TestCase { public function testNegativeTestcaseForAssertContainsOnlyInstancesOf() { // Assert function to check if testArray contains // single instance of Foo or not $this -> assertContainsOnlyInstancesOf ( Foo :: class , [ new Foo, new Bar, new Foo], "testArray doesn’t contains only instance of Foo " ); } }  
?>
Output:
PHPUnit 8.2.5 by Sebastian Bergmann and contributors. F 1/1 (100%) Time: 81 ms, Memory: 10.00 MB There was 1 failure: 1) GeeksPhpunitTestCase::testNegativeTestcaseForAssertContainsOnlyInstancesOf testArray doesn’t contains only instance of Foor Failed asserting that Array & amp; 0 (0 = > Foo Object & amp; 00000000051a5c33000000005d98efba() 1 = > Bar Object & amp; 00000000051a5d77000000005d98efba() 2 = > Foo Object & amp; 00000000051a5c32000000005d98efba()) contains only values ​​of type "Foo". /home/shivam/Documents/engineer/phpunit/abc.php:20 FAILURES! Tests: 1, Assertions: 1, Failures: 1. 
Program 2: use PHPUnitFrameworkTestCase; class Foo { public function dummyFunction() { return true;} } class Bar { public function dummyFunction() { return true;} } class GeeksPhpunitTestCase extends TestCase { public function testNegativeTestcaseForAssertContainsOnlyInstancesOf() { // Assert a function to check if testArray // single instance of Foo or not $this -> assertContainsOnlyInstancesOf ( Foo :: class , [ new Foo,  new Foo], "testArray contains only instance of Foo " ); } }  
?>
Output:
PHPUnit 8.2.5 by Sebastian Bergmann and contributors. ... 1/1 (100%) Time: 67 ms, Memory: 10.00 MB OK (1 test, 1 assertion) 
Note: To run testcases with PHPUnit steps follows from here . Additionally, assertContainsOnlyInstancesOf() is supported by phpunit 7 and up.

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