[DRE-maint] Bug#794157: FTBFS: Aruba::Api current_dir: `be_true` is not available from within an example

[Chris West (Faux)]

Source: ruby-aruba
Version: 0.5.4-2
Severity: serious
Tags: sid
Justification: fails to build from source
User: reproducible-builds at lists.alioth.debian.org
Usertags: ftbfs

Dear Maintainer,

The package fails to build:

Failures:

  1) Aruba::Api current_dir can be cleared
     Failure/Error: expect( File.exist? 'test' ).to be_true
       `be_true` is not available from within an example (e.g. an `it` block) or from constructs that run in the scope of an example (e.g. `before`, `let`, etc). It is only available on an example group (e.g. a `describe` or `context` block).
     # ./spec/aruba/api_spec.rb:41:in `block (4 levels) in <top (required)>'
     # ./lib/aruba/api.rb:15:in `chdir'
     # ./lib/aruba/api.rb:15:in `in_current_dir'
     # ./spec/aruba/api_spec.rb:40:in `block (3 levels) in <top (required)>'

Full build log:
https://reproducible.debian.net/rb-pkg/unstable/amd64/ruby-aruba.html

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.19.0-23-generic (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)