Because of compatibility with PHP 8

Author: mlantz

composer.json

@@ -28,7 +28,7 @@
     "require-dev": {
         "illuminate/database": "^6.0|^7.0|^8.0",
         "mockery/mockery": "~1.0",
-        "phpunit/phpunit": "~7.1"
+        "phpunit/phpunit": "~8.5"
     },
     "autoload": {
         "psr-4": {

tests/FormBuilderTest.php

@@ -669,20 +669,20 @@ public function testFormSelectYear()
         $select2 = (string) $this->formBuilder->selectYear('year', 2000, 2020, null, ['id' => 'foo']);
         $select3 = (string) $this->formBuilder->selectYear('year', 2000, 2020, '2000');
 
-        $this->assertContains('<select name="year"><option value="2000">2000</option><option value="2001">2001</option>',
+        $this->assertStringContainsString('<select name="year"><option value="2000">2000</option><option value="2001">2001</option>',
           $select1);
-        $this->assertContains('<select id="foo" name="year"><option value="2000">2000</option><option value="2001">2001</option>',
+        $this->assertStringContainsString('<select id="foo" name="year"><option value="2000">2000</option><option value="2001">2001</option>',
           $select2);
-        $this->assertContains('<select name="year"><option value="2000" selected="selected">2000</option><option value="2001">2001</option>',
+        $this->assertStringContainsString('<select name="year"><option value="2000" selected="selected">2000</option><option value="2001">2001</option>',
           $select3);
     }
 
     public function testFormSelectRange()
     {
         $range = (string) $this->formBuilder->selectRange('dob', 1900, 2013);
 
-        $this->assertContains('<select name="dob"><option value="1900">1900</option>', $range);
-        $this->assertContains('<option value="2013">2013</option>', $range);
+        $this->assertStringContainsString('<select name="dob"><option value="1900">1900</option>', $range);
+        $this->assertStringContainsString('<option value="2013">2013</option>', $range);
     }
 
     public function testFormSelectMonth()
@@ -691,10 +691,10 @@ public function testFormSelectMonth()
         $month2 = (string) $this->formBuilder->selectMonth('month', '1');
         $month3 = (string) $this->formBuilder->selectMonth('month', null, ['id' => 'foo']);
 
-        $this->assertContains('<select name="month"><option value="1">January</option><option value="2">February</option>',
+        $this->assertStringContainsString('<select name="month"><option value="1">January</option><option value="2">February</option>',
           $month1);
-        $this->assertContains('<select name="month"><option value="1" selected="selected">January</option>', $month2);
-        $this->assertContains('<select id="foo" name="month"><option value="1">January</option>', $month3);
+        $this->assertStringContainsString('<select name="month"><option value="1" selected="selected">January</option>', $month2);
+        $this->assertStringContainsString('<select id="foo" name="month"><option value="1">January</option>', $month3);
     }
 
     public function testFormCheckbox()