[DRE-maint] Bug#794154: FTBFS: undefined method `stub!' for Dir:Class

[Chris West (Faux)]

Source: spork
Version: 0.9.2-2
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) Spork::Diagnoser.output_results outputs the results relative to the current directory
     Failure/Error: Dir.stub!(:pwd).and_return("/project_path")
     NoMethodError:
       undefined method `stub!' for Dir:Class
     # ./spec/spork/diagnoser_spec.rb:97:in `block (3 levels) in <top (required)>'

....

Finished in 1.36 seconds (files took 0.33898 seconds to load)
54 examples, 13 failures

Full build log:
https://reproducible.debian.net/rb-pkg/unstable/amd64/spork.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)