add tests for use trait adaptation

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 - displays more detailed errors if json config format is not valid
+- fixed fatal error when parsing trait usage with modified visibility (#44)
 
 ## [0.1.6] - 2017-09-24
 ### Added

src/ComposerRequireChecker/NodeVisitor/UsedSymbolCollector.php

@@ -150,7 +150,9 @@ private function recordTraitUsage(Node $node)
         array_map([$this, 'recordUsageOf'], $node->traits);
 
         foreach ($node->adaptations as $adaptation) {
-            $this->recordUsageOf($adaptation->trait);
+            if (null !== $adaptation->trait) {
+                $this->recordUsageOf($adaptation->trait);
+            }
 
             if ($adaptation instanceof Node\Stmt\TraitUseAdaptation\Precedence) {
                 array_map([$this, 'recordUsageOf'], $adaptation->insteadof);

test/ComposerRequireCheckerTest/NodeVisitor/DefinedSymbolCollectorFunctionalTest.php

@@ -95,6 +95,17 @@ public function testWillCollectNamespacedConstDefinition()
         );
     }
 
+    public function testTraitAdaptionDefinition()
+    {
+        $this->traverseStringAST('namespace Foo; trait BarTrait { protected function test(){}} class UseTrait { use BarTrait {test as public;} }');
+
+        self::assertSameCollectedSymbols(
+            ['Foo\BarTrait', 'Foo\UseTrait'],
+            $this->collector->getDefinedSymbols()
+        );
+    }
+
+
     private function traverseStringAST(string $phpSource): array
     {
         return $this->traverser->traverse($this->parser->parse('<?php ' . $phpSource));

test/ComposerRequireCheckerTest/NodeVisitor/UsedSymbolCollectorFunctionalTest.php

@@ -139,6 +139,16 @@ public function testWontCollectAnyUsageTypes()
         );
     }
 
+    public function testUseTraitAdaptionAlias()
+    {
+        $this->traverseStringAST('<?php namespace Foo; trait BarTrait { protected function test(){}} class UseTrait { use BarTrait {test as public;} }');
+
+        self::assertSameCollectedSymbols(
+            ['Foo\BarTrait'],
+            $this->collector->getCollectedSymbols()
+        );
+    }
+
     private function traverseStringAST(string $stringAST)
     {
         return $this->traverser->traverse(

test/ComposerRequireCheckerTest/NodeVisitor/UsedSymbolCollectorTest.php

@@ -19,6 +19,7 @@
 use PhpParser\Node\Stmt\Function_;
 use PhpParser\Node\Stmt\Interface_;
 use PhpParser\Node\Stmt\TraitUse;
+use PhpParser\Node\Stmt\TraitUseAdaptation\Alias;
 use PHPUnit\Framework\TestCase;
 
 /**
@@ -304,6 +305,18 @@ public function testTraits()
         $this->assertContains('Foo', $symbols);
     }
 
+    public function testTraitUseVisibilityAdaptation()
+    {
+        $traitUseAdaption = new Alias(null, 'testMethod', Class_::MODIFIER_PUBLIC, null);
+        $traitUse = new TraitUse([new Name('Foo')], [$traitUseAdaption]);
+
+        $this->visitor->enterNode($traitUse);
+
+        $symbols = $this->visitor->getCollectedSymbols();
+        $this->assertCount(1, $symbols);
+        $this->assertContains('Foo', $symbols);
+    }
+
     public function testBeforeTraverseResetsRecordedSymbols()
     {
         $node = new Class_('Foo');