Add tests for FileSystem class (#51654)

Author: imanghafoori1

tests/Filesystem/FilesystemTest.php

@@ -59,21 +59,28 @@ public function testLines()
     {
         $path = self::$tempDir.'/file.txt';
 
-        $contents = LazyCollection::times(3)
-            ->map(function ($number) {
-                return "line-{$number}";
-            })
-            ->join("\n");
-
+        $contents = ' '.PHP_EOL.' spaces around '.PHP_EOL.PHP_EOL.'Line 2'.PHP_EOL.'1 trailing empty line ->'.PHP_EOL.PHP_EOL;
         file_put_contents($path, $contents);
 
         $files = new Filesystem;
         $this->assertInstanceOf(LazyCollection::class, $files->lines($path));
 
         $this->assertSame(
-            ['line-1', 'line-2', 'line-3'],
+            [' ', ' spaces around ', '', 'Line 2', '1 trailing empty line ->', '', ''],
             $files->lines($path)->all()
         );
+
+        // an empty file:
+        ftruncate(fopen($path, 'w'), 0);
+        $this->assertSame([''], $files->lines($path)->all());
+    }
+
+    public function testLinesThrowsExceptionNonexisitingFile()
+    {
+        $this->expectException(FileNotFoundException::class);
+        $this->expectExceptionMessage('File does not exist at path '.__DIR__.'/unknown-file.txt.');
+
+        (new Filesystem)->lines(__DIR__.'/unknown-file.txt');
     }
 
     public function testReplaceCreatesFile()
@@ -324,9 +331,9 @@ public function testMoveDirectoryReturnsFalseWhileOverwritingAndUnableToDeleteDe
     public function testGetThrowsExceptionNonexisitingFile()
     {
         $this->expectException(FileNotFoundException::class);
+        $this->expectExceptionMessage('File does not exist at path '.self::$tempDir.'/unknown-file.txt.');
 
-        $files = new Filesystem;
-        $files->get(self::$tempDir.'/unknown-file.txt');
+        (new Filesystem)->get(self::$tempDir.'/unknown-file.txt');
     }
 
     public function testGetRequireReturnsProperly()
@@ -339,9 +346,9 @@ public function testGetRequireReturnsProperly()
     public function testGetRequireThrowsExceptionNonExistingFile()
     {
         $this->expectException(FileNotFoundException::class);
+        $this->expectExceptionMessage('File does not exist at path '.self::$tempDir.'/unknown-file.txt.');
 
-        $files = new Filesystem;
-        $files->getRequire(self::$tempDir.'/file.php');
+        (new Filesystem)->getRequire(self::$tempDir.'/unknown-file.txt');
     }
 
     public function testJsonReturnsDecodedJsonData()
@@ -564,6 +571,14 @@ public function testRequireOnceRequiresFileProperly()
         $this->assertFalse(function_exists('random_function_xyz_changed'));
     }
 
+    public function testRequireOnceThrowsExceptionNonexisitingFile()
+    {
+        $this->expectException(FileNotFoundException::class);
+        $this->expectExceptionMessage('File does not exist at path '.__DIR__.'/unknown-file.txt.');
+
+        (new Filesystem)->requireOnce(__DIR__.'/unknown-file.txt');
+    }
+
     public function testCopyCopiesFileProperly()
     {
         $filesystem = new Filesystem;