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PHPUnit | AssertContainsOnly () Function

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Syntax:
assertContainsOnly (string $dataType, array $array, boolean $isNativeType = null, string $message = ’’) 
Parameters: This function takes four parameters as shown in the above syntax. The parameters are described below:
  • $dataType: this parameter is a string consisting of the name of the data type.
  • $array: This parameter is an array for which the assert function will check if it contains only values ​​of the given type or not.
  • $isNativeType: these parameters indicate whether the datatype is a native PHP datatype or not.
  • $message: this parameter accepts a string value. When the test case failed, this string message was displayed as an error message.
The following programs illustrate the assertContainsOnly() function in PHPUnit: Program 1: use PHPUnitFrameworkTestCase; class GeeksPhpunitTestCase extends TestCase { public function testNegativeTestcaseForAssertContainsOnly() { $testArray = array ( " engineerforgeek " , 2); $dataType = "string" ; // assert function to check for testArray // string values ​​only $this -> assertContainsOnly ( $dataType , $testArray , null, " testArray doesn’t contains only string " ); } }  
?>
Output:
PHPUnit 8.2.5 by Sebastian Bergmann and contributors. F 1/1 (100%) Time: 236 ms, Memory: 10.00 MB There was 1 failure: 1) GeeksPhpunitTestCase::testNegativeTestcaseForAssertContainsOnly testArray doen’t contains only string Failed asserting that Array & amp; 0 (0 = > ’engineerforgeek’ 1 = > 2) contains only values ​​of type "string". /home/shivam/Documents/engineer/phpunit/abc.php:11 FAILURES! Tests: 1, Assertions: 1, Failures: 1. 
Program 2: use PHPUnitFrameworkTestCase; class GeeksPhpunitTestCase extends TestCase { public function testPositiveTestcaseForAssertContainsOnly() { $testArray = array ( " engineerforgeek " , "learn" ); $dataType = "string" ; // assert function to check for testArray // string values ​​only $this -> assertContainsOnly ( $dataType , $testArray , null, " testArray doesn’t contains only string " ); } }  
?>
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 . Also assertContainsOnly() is supported by phpunit 7 and higher.

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