'File does not exist: test_helper' error on 'rake test:integration'

[Apteryks]

Hi!

While packaging this for GNU Guix, I stumbled upon the following error, which I can't make sense of:

$ rake test:integration --trace
** Invoke test:integration (first_time)
** Invoke compile (first_time)
** Invoke compile:x86_64-linux (first_time)
** Invoke compile:liquid_c:x86_64-linux (first_time)
** Invoke copy:liquid_c:x86_64-linux:2.7.4 (first_time)
** Invoke lib (first_time, not_needed)
** Invoke tmp/x86_64-linux/liquid_c/2.7.4/liquid_c.so (first_time, not_needed)
** Invoke tmp/x86_64-linux/liquid_c/2.7.4 (first_time, not_needed)
** Invoke tmp/x86_64-linux/liquid_c/2.7.4/Makefile (first_time, not_needed)
** Invoke tmp/x86_64-linux/liquid_c/2.7.4 (not_needed)
** Invoke ext/liquid_c/extconf.rb (first_time, not_needed)
** Invoke ext/liquid_c/block.c (first_time, not_needed)
** Invoke ext/liquid_c/c_buffer.c (first_time, not_needed)
** Invoke ext/liquid_c/context.c (first_time, not_needed)
** Invoke ext/liquid_c/document_body.c (first_time, not_needed)
** Invoke ext/liquid_c/expression.c (first_time, not_needed)
** Invoke ext/liquid_c/lexer.c (first_time, not_needed)
** Invoke ext/liquid_c/liquid.c (first_time, not_needed)
** Invoke ext/liquid_c/parse_context.c (first_time, not_needed)
** Invoke ext/liquid_c/parser.c (first_time, not_needed)
** Invoke ext/liquid_c/raw.c (first_time, not_needed)
** Invoke ext/liquid_c/resource_limits.c (first_time, not_needed)
** Invoke ext/liquid_c/tokenizer.c (first_time, not_needed)
** Invoke ext/liquid_c/usage.c (first_time, not_needed)
** Invoke ext/liquid_c/variable.c (first_time, not_needed)
** Invoke ext/liquid_c/variable_lookup.c (first_time, not_needed)
** Invoke ext/liquid_c/vm.c (first_time, not_needed)
** Invoke ext/liquid_c/vm_assembler.c (first_time, not_needed)
** Invoke ext/liquid_c/vm_assembler_pool.c (first_time, not_needed)
** Invoke tmp/x86_64-linux/stage/lib (first_time, not_needed)
** Execute copy:liquid_c:x86_64-linux:2.7.4
install -c tmp/x86_64-linux/liquid_c/2.7.4/liquid_c.so lib/liquid_c.so
cp tmp/x86_64-linux/liquid_c/2.7.4/liquid_c.so tmp/x86_64-linux/stage/lib/liquid_c.so
** Execute compile:liquid_c:x86_64-linux
** Execute compile:x86_64-linux
** Execute compile
** Execute test:integration

File does not exist: test_helper

rake aborted!
Command failed with status (1): [ruby -w -I"lib:lib" -I"/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib" "/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/rake_test_loader.rb" "test/integration_test.rb" ]
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/testtask.rb:130:in `block (3 levels) in define'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/file_utils.rb:57:in `sh'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/file_utils.rb:104:in `ruby'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/testtask.rb:117:in `block (2 levels) in define'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/file_utils_ext.rb:58:in `verbose'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/testtask.rb:111:in `block in define'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/task.rb:281:in `block in execute'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/task.rb:281:in `each'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/task.rb:281:in `execute'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/task.rb:219:in `block in invoke_with_call_chain'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/task.rb:199:in `synchronize'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/task.rb:199:in `invoke_with_call_chain'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/task.rb:188:in `invoke'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/application.rb:160:in `invoke_task'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/application.rb:116:in `block (2 levels) in top_level'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/application.rb:116:in `each'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/application.rb:116:in `block in top_level'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/application.rb:125:in `run_with_threads'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/application.rb:110:in `top_level'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/application.rb:83:in `block in run'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/application.rb:186:in `standard_exception_handling'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/lib/rake/application.rb:80:in `run'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/lib/ruby/gems/2.7.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/bin/rake:23:in `load'
/gnu/store/j4z07lyi1ykk8bc68h1p4bpj1il9dn3f-ruby-2.7.4/bin/rake:23:in `<main>'
Tasks: TOP => test:integration

I'm using the 4.1.0 released gem as the source, with Ruby 2.7.4 and the following direct dependencies:

ruby-benchmark-ips@2.8.2 ruby-liquid@5.4.0 ruby-rake-compiler@1.1.1 ruby-ruby-memcheck@1.2.0 ruby-spy@1.0.5 ruby-stackprof@0.2.17

The unit tests are OK. Any ideas?

[Apteryks]

I also get this error when building straight from a git checkout.