add unit tests for getLineNumbers method

Author: patinthehat

tests/CodeSnippetTest.php

@@ -171,4 +171,16 @@ public function it_returns_a_string_when_the_snippet_is_cast_to_a_string()
 
         $this->assertMatchesSnapshot((string)$snippet);
     }
+
+    /** @test */
+    public function it_returns_the_line_numbers()
+    {
+        $snippet = (new CodeSnippet())
+            ->surroundingLines(10, 12)
+            ->snippetLineCount(8)
+            ->fromFile($this->testsPath('data/file3.php'));
+
+        $this->assertCount(8, $snippet->getLineNumbers());
+        $this->assertMatchesSnapshot($snippet->getLineNumbers());
+    }
 }

tests/__snapshots__/CodeSnippetTest__it_returns_the_line_numbers__1.yml

@@ -0,0 +1,8 @@
+- 7
+- 8
+- 9
+- 10
+- 11
+- 12
+- 13
+- 14