Bob Silva posted Testing Gotchas in Rails in mid-October. I had fallen across this error myself a few times.

Well, today I had a huge code base I needed to check. I wrote the following Rake task:


1 # Find missing fixtures declarations from Rails tests
2 # Code by Francois Beausoleil (
3 # Released in the public domain. Do as you wish.
4 desc "Finds missing fixtures declarations from your tests"
5 task :find_missing_fixtures do
6 state = :find_test_case
7 test_case = nil
9 Dir[test//_test.rb].each do |file|
10, r) do |f|
11 f.each do |line|
12 case state
13 when :find_fixture
14 case line
15 when /def test_/
16 printf "%s: %s\n", file, test_case
17 state = :find_test_case
18 when /fixtures/
19 state = :find_test_case
20 when /class (\w) < Test::Unit::TestCase$/
21 test_case = $1
22 state = :find_test_case
23 end
25 when :find_test_case
26 case line
27 when /class (\w) < Test::Unit::TestCase$/
28 test_case = $1
29 state = :find_fixture
30 end
31 end
32 end
33 end
34 end
35 end

Run it like this:

1 $ rake find_missing_fixtures
2 (in D:/wwwroot/
3 test/unit/name_test.rb: NameTest
4 test/unit/application_helper_test.rb: ApplicationHelperTest
5 test/unit/application_helper_test.rb: ApplicationHelperTruncationTest

Why do I report both the file and TestCase name ? Because I put more than one TestCase per test file, as I reported in Test fixtures and behavioral testing

Of course, if I could do away with fixtures altogether…


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I am François Beausoleil, a Ruby on Rails and Scala developer. During the day, I work on Seevibes, a platform to measure social interactions related to TV shows. At night, I am interested many things. Read my biography.

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