add unit tests for getSelectedBounds method

Author: patinthehat

tests/CodeSnippetTest.php

@@ -183,4 +183,15 @@ public function it_returns_the_line_numbers()
         $this->assertCount(8, $snippet->getLineNumbers());
         $this->assertMatchesSnapshot($snippet->getLineNumbers());
     }
+
+    /** @test */
+    public function it_returns_the_selected_bounds()
+    {
+        $snippet = (new CodeSnippet())
+            ->surroundingLines(10, 12)
+            ->snippetLineCount(8)
+            ->fromFile($this->testsPath('data/file3.php'));
+
+        $this->assertEquals([10, 11, 12], range($snippet->getSelectedBounds()->start, $snippet->getSelectedBounds()->end));
+    }
 }