diff --git a/spec/support/rb_bug.rb b/spec/support/rb_bug.rb
index 19223fe1..bb29196c 100644
--- a/spec/support/rb_bug.rb
+++ b/spec/support/rb_bug.rb
@@ -16,5 +16,3 @@ module RbBug
   end
 
 end # RbBug
-
-
diff --git a/spec/unit/mutant/runner/collector_spec.rb b/spec/unit/mutant/runner/collector_spec.rb
index df1e5405..296ee0f9 100644
--- a/spec/unit/mutant/runner/collector_spec.rb
+++ b/spec/unit/mutant/runner/collector_spec.rb
@@ -79,7 +79,13 @@ describe Mutant::Runner::Collector do
 
     it 'aggregates results in #result' do
       subject
-      expect(object.result).to eql(Mutant::Result::Env.new(env: object.env, runtime: 0.0, subject_results: [subject_a_result]))
+      expect(object.result).to eql(
+        Mutant::Result::Env.new(
+          env: object.env,
+          runtime: 0.0,
+          subject_results: [subject_a_result]
+        )
+      )
     end
 
     it_should_behave_like 'a command method'
diff --git a/spec/unit/mutant/subject/method/instance_spec.rb b/spec/unit/mutant/subject/method/instance_spec.rb
index 3cf0849f..b59ed3ed 100644
--- a/spec/unit/mutant/subject/method/instance_spec.rb
+++ b/spec/unit/mutant/subject/method/instance_spec.rb
@@ -35,7 +35,7 @@ RSpec.describe Mutant::Subject::Method::Instance do
   describe '#match_expression' do
     subject { object.match_expressions }
 
-    it { should eql(%w(Test#foo Test*).map(&Mutant::Expression.method(:parse))) }
+    it { should eql(%w[Test#foo Test*].map(&Mutant::Expression.method(:parse))) }
 
     it_should_behave_like 'an idempotent method'
   end
diff --git a/spec/unit/mutant/subject/method/singleton_spec.rb b/spec/unit/mutant/subject/method/singleton_spec.rb
index d6745247..c900cfca 100644
--- a/spec/unit/mutant/subject/method/singleton_spec.rb
+++ b/spec/unit/mutant/subject/method/singleton_spec.rb
@@ -30,7 +30,7 @@ RSpec.describe Mutant::Subject::Method::Singleton do
   describe '#match_expression' do
     subject { object.match_expressions }
 
-    it { should eql(%w(Test.foo Test*).map(&Mutant::Expression.method(:parse))) }
+    it { should eql(%w[Test.foo Test*].map(&Mutant::Expression.method(:parse))) }
 
     it_should_behave_like 'an idempotent method'
   end