Add multiline method chaining fixer with Pest assertion exceptions

Author: stayallive

README.md

@@ -128,3 +128,5 @@ Once a method chain continues on a new line, each subsequent segment also starts
 +     ->filter()
 +     ->values();
 ```
+
+In `*Test.php` files, Pest expectation segments such as `->and(...)->...` and `->not->...` stay together.

src/Fixer/MultilineMethodChainingFixer.php

@@ -62,7 +62,7 @@ protected function applyFix(SplFileInfo $file, Tokens $tokens): void
             if (
                 $previousOperatorIndex === null
                 || !$this->startsOnNewLine($tokens, $previousOperatorIndex)
-                || $isTestFile && $this->isAndExpectationSegment($tokens, $previousOperatorIndex)
+                || $isTestFile && $this->isPestExpectationSegment($tokens, $previousOperatorIndex)
             ) {
                 continue;
             }
@@ -81,13 +81,13 @@ protected function applyFix(SplFileInfo $file, Tokens $tokens): void
         }
     }
 
-    private function isAndExpectationSegment(Tokens $tokens, int $operatorIndex): bool
+    private function isPestExpectationSegment(Tokens $tokens, int $operatorIndex): bool
     {
         $methodNameIndex = $tokens->getNextMeaningfulToken($operatorIndex);
 
         return $methodNameIndex !== null
             && $tokens[$methodNameIndex]->isGivenKind(T_STRING)
-            && strtolower($tokens[$methodNameIndex]->getContent()) === 'and';
+            && in_array(strtolower($tokens[$methodNameIndex]->getContent()), ['and', 'not'], true);
     }
 
     private function previousChainObjectOperator(Tokens $tokens, int $index): ?int

tests/Unit/MultilineMethodChainingFixerTest.php

@@ -99,6 +99,20 @@ public function testItKeepsPestAndExpectationSegmentsTogetherInTestFiles(): void
     ->and($second)->toBeFalse()
     ->and($third)->toBeNull();
 
+PHP;
+
+        $this->assertSame($source, $this->fix($source));
+    }
+
+    public function testItKeepsPestNotExpectationSegmentsTogetherInTestFiles(): void
+    {
+        $source = <<<'PHP'
+<?php
+
+expect($value)
+    ->toContain('included')
+    ->not->toContain('excluded');
+
 PHP;
 
         $this->assertSame($source, $this->fix($source));