Improve test

Author: sebastianbergmann

tests/ChunkTest.php

@@ -27,6 +27,11 @@ protected function setUp(): void
         $this->chunk = new Chunk;
     }
 
+    public function testHasInitiallyNoLines(): void
+    {
+        $this->assertSame([], $this->chunk->getLines());
+    }
+
     public function testCanBeCreatedWithoutArguments(): void
     {
         $this->assertInstanceOf(Chunk::class, $this->chunk);
@@ -59,10 +64,10 @@ public function testLinesCanBeRetrieved(): void
 
     public function testLinesCanBeSet(): void
     {
-        $this->assertSame([], $this->chunk->getLines());
+        $lines = [new Line(Line::ADDED, 'added'), new Line(Line::REMOVED, 'removed')];
+
+        $this->chunk->setLines($lines);
 
-        $testValue = ['line0', 'line1'];
-        $this->chunk->setLines($testValue);
-        $this->assertSame($testValue, $this->chunk->getLines());
+        $this->assertSame($lines, $this->chunk->getLines());
     }
 }