Add rspectre to CI

- This can help detect unused test setup on an ongoing basis and also helps me by giving me a bigger corpus of `rspectre` users.

Author: dgollahon

.github/workflows/ci.yml

@@ -26,6 +26,22 @@ jobs:
         bundler-cache: true
         ruby-version: ${{ matrix.ruby }}
     - run: bundle exec rspec spec/unit
+  rspectre:
+    name: RSpectre
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ruby-3.2]
+        os: [ubuntu-latest]
+    steps:
+    - uses: actions/checkout@v3
+    - uses: ruby/setup-ruby@v1
+      with:
+        bundler-cache: true
+        ruby-version: ${{ matrix.ruby }}
+    - run: bundle exec rspectre
   ruby-mutant:
     name: Mutant
     runs-on: ${{ matrix.os }}

Gemfile.lock

@@ -26,7 +26,7 @@ GEM
       mutant (= 0.11.18)
       rspec-core (>= 3.8.0, < 4.0.0)
     parallel (1.22.1)
-    parser (3.2.0.0)
+    parser (3.2.2.1)
       ast (~> 2.4.1)
     rainbow (3.1.1)
     regexp_parser (2.6.1)
@@ -47,6 +47,9 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.0)
+    rspectre (0.1.0)
+      parser (>= 3.2.2.1)
+      rspec (~> 3.9)
     rubocop (1.42.0)
       json (~> 2.3)
       parallel (~> 1.10)
@@ -75,6 +78,7 @@ DEPENDENCIES
   rspec (~> 3.9)
   rspec-core (~> 3.9)
   rspec-its (~> 1.3.0)
+  rspectre (~> 0.1)
   rubocop (~> 1.7)
   rubocop-packaging (~> 0.5)
   unparser!

unparser.gemspec

@@ -33,6 +33,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency('rspec',             '~> 3.9')
   gem.add_development_dependency('rspec-core',        '~> 3.9')
   gem.add_development_dependency('rspec-its',         '~> 1.3.0')
+  gem.add_development_dependency('rspectre',          '~> 0.1')
   gem.add_development_dependency('rubocop',           '~> 1.7')
   gem.add_development_dependency('rubocop-packaging', '~> 0.5')
 end