Test the JsonlParser using the tmpfile()

tests/BaseTestCase.php

@@ -17,4 +17,15 @@ protected static function streamFromString(string $string)
 
         return $stream;
     }
+
+    /**
+     * @return Generator<string>
+     */
+    protected static function iterator(): Generator
+    {
+        yield 'one';
+        yield 'two';
+        yield 'three';
+    }
+
 }

tests/JsonParserTest.php

@@ -90,14 +90,7 @@ public function testPushItems(): void
         $stream = self::streamFromString('');
         $parser = new JsonlParser($stream);
 
-        function iterator(): Generator
-        {
-            yield 'one';
-            yield 'two';
-            yield 'three';
-        }
-
-        $parser->pushItems(items:iterator());
+        $parser->pushItems(items:self::iterator());
         $this->assertCount(3, $parser);
 
         $list = iterator_to_array($parser->iterate());
@@ -106,4 +99,31 @@ function iterator(): Generator
         $this->assertCount(3, $list);
         $this->assertSame(['three', 'two', 'one'], $list);
     }
+
+    public function testOpensAnEmptyFile(): void
+    {
+        $stream = tmpfile();
+        $parser = new JsonlParser($stream);
+        $this->assertNull($parser->pop());
+        $this->assertCount(0, $parser);
+
+        fclose($stream); // this removes the file
+    }
+    public function testPushItemsToFile(): void
+    {
+        $stream = tmpfile();
+        $parser = new JsonlParser($stream);
+        $this->assertCount(0, $parser);
+
+        $parser->pushItems(items:self::iterator());
+        $this->assertCount(3, $parser);
+
+        $list = iterator_to_array($parser->iterate());
+
+        $this->assertCount(0, $parser);
+        $this->assertCount(3, $list);
+        $this->assertSame(['three', 'two', 'one'], $list);
+
+        fclose($stream); // this removes the file
+    }
 }