Verify generation of autoload_psr4.php even if empty.

tests/Composer/Test/Autoload/AutoloadGeneratorTest.php

@@ -518,6 +518,20 @@ return array(
     'A' => array(\$vendorDir . '/a/a/src'),
 );
 
+EOF;
+
+        // autoload_psr4.php is expected to be empty in this example.
+        $expectedPsr4 = <<<EOF
+<?php
+
+// autoload_psr4.php @generated by Composer
+
+\$vendorDir = dirname(dirname(__FILE__));
+\$baseDir = dirname(\$vendorDir);
+
+return array(
+);
+
 EOF;
 
         $expectedClassmap = <<<EOF
@@ -537,6 +551,7 @@ EOF;
 
         $this->generator->dump($this->config, $this->repository, $package, $this->im, 'composer', true, '_9');
         $this->assertEquals($expectedNamespace, file_get_contents($this->vendorDir.'/composer/autoload_namespaces.php'));
+        $this->assertEquals($expectedPsr4, file_get_contents($this->vendorDir.'/composer/autoload_psr4.php'));
         $this->assertEquals($expectedClassmap, file_get_contents($this->vendorDir.'/composer/autoload_classmap.php'));
     }
 
@@ -766,6 +781,20 @@ return array(
     'Bar' => array($vendorDir . '/b/b/lib'),
 );
 
+EOF;
+
+        // autoload_psr4.php is expected to be empty in this example.
+        $expectedPsr4 = <<<'EOF'
+<?php
+
+// autoload_psr4.php @generated by Composer
+
+$vendorDir = dirname(dirname(__FILE__));
+$baseDir = dirname($vendorDir).'/working-dir';
+
+return array(
+);
+
 EOF;
 
         $expectedClassmap = <<<'EOF'
@@ -786,6 +815,7 @@ return array(
 EOF;
 
         $this->assertEquals($expectedNamespace, file_get_contents($vendorDir.'/composer/autoload_namespaces.php'));
+        $this->assertEquals($expectedPsr4, file_get_contents($vendorDir.'/composer/autoload_psr4.php'));
         $this->assertEquals($expectedClassmap, file_get_contents($vendorDir.'/composer/autoload_classmap.php'));
         $this->assertContains("\n    \$vendorDir . '/b/b/bootstrap.php',\n", file_get_contents($vendorDir.'/composer/autoload_files.php'));
         $this->assertContains("\n    \$baseDir . '/test.php',\n", file_get_contents($vendorDir.'/composer/autoload_files.php'));
@@ -828,6 +858,20 @@ return array(
     'Foo' => array($baseDir . '/../src'),
 );
 
+EOF;
+
+        // autoload_psr4.php is expected to be empty in this example.
+        $expectedPsr4 = <<<'EOF'
+<?php
+
+// autoload_psr4.php @generated by Composer
+
+$vendorDir = dirname(dirname(__FILE__));
+$baseDir = dirname($vendorDir).'/working-dir';
+
+return array(
+);
+
 EOF;
 
     $expectedClassmap = <<<'EOF'
@@ -846,6 +890,7 @@ return array(
 EOF;
 
         $this->assertEquals($expectedNamespace, file_get_contents($this->vendorDir.'/composer/autoload_namespaces.php'));
+        $this->assertEquals($expectedPsr4, file_get_contents($this->vendorDir.'/composer/autoload_psr4.php'));
         $this->assertEquals($expectedClassmap, file_get_contents($this->vendorDir.'/composer/autoload_classmap.php'));
         $this->assertContains("\n    \$baseDir . '/../test.php',\n", file_get_contents($this->vendorDir.'/composer/autoload_files.php'));
     }
@@ -880,6 +925,20 @@ return array(
     'Foo' => array($baseDir . '/'),
 );
 
+EOF;
+
+        // autoload_psr4.php is expected to be empty in this example.
+        $expectedPsr4 = <<<EOF
+<?php
+
+// autoload_psr4.php @generated by Composer
+
+\$vendorDir = dirname(dirname(__FILE__));
+\$baseDir = dirname(\$vendorDir);
+
+return array(
+);
+
 EOF;
 
     $expectedClassmap = <<<'EOF'
@@ -898,6 +957,7 @@ return array(
 EOF;
 
         $this->assertEquals($expectedNamespace, file_get_contents($this->vendorDir.'/composer/autoload_namespaces.php'));
+        $this->assertEquals($expectedPsr4, file_get_contents($this->vendorDir.'/composer/autoload_psr4.php'));
         $this->assertEquals($expectedClassmap, file_get_contents($this->vendorDir.'/composer/autoload_classmap.php'));
     }
 
@@ -926,10 +986,25 @@ return array(
     'Foo' => array($baseDir . '/composer-test-autoload-src/src'),
 );
 
+EOF;
+
+        // autoload_psr4.php is expected to be empty in this example.
+        $expectedPsr4 = <<<EOF
+<?php
+
+// autoload_psr4.php @generated by Composer
+
+\$vendorDir = dirname(dirname(__FILE__));
+\$baseDir = dirname(\$vendorDir);
+
+return array(
+);
+
 EOF;
 
         $this->generator->dump($this->config, $this->repository, $package, $this->im, 'composer', false, 'VendorSubstring');
         $this->assertEquals($expectedNamespace, file_get_contents($this->vendorDir.'/composer/autoload_namespaces.php'));
+        $this->assertEquals($expectedPsr4, file_get_contents($this->vendorDir.'/composer/autoload_psr4.php'));
     }
 
     private function assertAutoloadFiles($name, $dir, $type = 'namespaces')