diff --git a/lib/matchers/matchers.rb b/lib/matchers/matchers.rb
index 2b94e3a6a..430b3cdf8 100644
--- a/lib/matchers/matchers.rb
+++ b/lib/matchers/matchers.rb
@@ -76,7 +76,7 @@ end
 RSpec::Matchers.define :contain_match do |regex|
   match do |arr|
     arr.inject { |result, i|
-      match = i.match(regex)
+      result = i.match(regex)
       result || i.match(/$/)
     }
   end
diff --git a/lib/verify/dummy.rb b/lib/verify/dummy.rb
index 2e314077f..010df159d 100644
--- a/lib/verify/dummy.rb
+++ b/lib/verify/dummy.rb
@@ -5,14 +5,15 @@
 # Get types
 module DummyTestTypes
   # a few commands with special handling
-  def describe *args; end
-  def context *args; end
+  def describe(*_args); end
+
+  def context(*_args); end
 
   def os
     {}
   end
 
-  def command(sth)
+  def command(_sth)
     res = OpenStruct.new
     res.stdout = ''
     res.stderr = ''
@@ -24,28 +25,42 @@ module DummyVulcanoTypes
   %w{
     attributes registry_key
   }.each do |name|
-    define_method name do |*arg|
+    define_method name do |*_arg|
     end
   end
 
-  def processes *args; [] end
-  def start_postgres_session *args; Describer.new end
-  def start_mysql_session *args; Describer.new end
+  def processes(*_args)
+    []
+  end
+
+  def start_postgres_session(*_args)
+    Describer.new
+  end
+
+  def start_mysql_session(*_args)
+    Describer.new
+  end
 
   class Describer
-    def describe(*args)
-    end
+    def describe(*_args); end
   end
 end
 
 class SshConf
-  def initialize *args; end
+  def initialize(*_args); end
 end
 class PostgresConf
-  def initialize *args; end
-  def params *a, &b; {} end
+  def initialize(*_args); end
+
+  def params(*_a, &_b)
+    {}
+  end
 end
+
 class MysqlConf
-  def initialize *args; end
-  def params *a, &b; {} end
+  def initialize(*_args); end
+
+  def params(*_a, &_b)
+    {}
+  end
 end