railstutorial.org : Rails Integrated Testing .... Section 5.3 . Why is this test failing?

FAIL["test_layout_links", SiteLayoutTest, 2015-05-20 19:37:56 +0530] test_layout_links#SiteLayoutTest (1432130876.75s) Expected exactly 2 elements matching "a[href="/"]", found 0.. Expected: 2 Actual: 0 test/integration/site_layout_test.rb:8:in `block in '

6/6: [====================================================================================================================================================================================] 100% Time: 00:00:00, Time: 00:00:00