diff --git a/spec/lib/rex/exploitation/cmdstager/base_spec.rb b/spec/lib/rex/exploitation/cmdstager/base_spec.rb
index c3bb4a5e98..7667ce19b9 100644
--- a/spec/lib/rex/exploitation/cmdstager/base_spec.rb
+++ b/spec/lib/rex/exploitation/cmdstager/base_spec.rb
@@ -8,8 +8,7 @@ describe Rex::Exploitation::CmdStagerBase do
   let(:exe) { "MZ" }
 
   subject(:cmd_stager) do
-    cmd_stager = Rex::Exploitation::CmdStagerBase.new(exe)
-    cmd_stager
+    described_class.new(exe)
   end
 
   describe '#cmd_concat_operator' do
diff --git a/spec/lib/rex/exploitation/cmdstager/bourne_spec.rb b/spec/lib/rex/exploitation/cmdstager/bourne_spec.rb
index 075a7adf45..0a072db8a9 100644
--- a/spec/lib/rex/exploitation/cmdstager/bourne_spec.rb
+++ b/spec/lib/rex/exploitation/cmdstager/bourne_spec.rb
@@ -8,8 +8,7 @@ describe Rex::Exploitation::CmdStagerBourne do
   let(:exe) { "MZ" }
 
   subject(:cmd_stager) do
-    cmd_stager = Rex::Exploitation::CmdStagerBourne.new(exe)
-    cmd_stager
+    described_class.new(exe)
   end
 
   describe '#cmd_concat_operator' do
@@ -20,7 +19,10 @@ describe Rex::Exploitation::CmdStagerBourne do
 
   describe '#generate' do
     it "returns an array of commands" do
-      expect(cmd_stager.generate).to_not be_empty
+      result = cmd_stager.generate
+
+      expect(result).to be_kind_of(Array)
+      expect(result).to_not be_empty
     end
   end
 
diff --git a/spec/lib/rex/exploitation/cmdstager/debug_asm_spec.rb b/spec/lib/rex/exploitation/cmdstager/debug_asm_spec.rb
index c981a8ef04..06d53c477e 100644
--- a/spec/lib/rex/exploitation/cmdstager/debug_asm_spec.rb
+++ b/spec/lib/rex/exploitation/cmdstager/debug_asm_spec.rb
@@ -8,8 +8,7 @@ describe Rex::Exploitation::CmdStagerDebugAsm do
   let(:exe) { "MZ" }
 
   subject(:cmd_stager) do
-    cmd_stager = Rex::Exploitation::CmdStagerDebugAsm.new(exe)
-    cmd_stager
+    described_class.new(exe)
   end
 
   describe '#cmd_concat_operator' do
@@ -26,7 +25,10 @@ describe Rex::Exploitation::CmdStagerDebugAsm do
     end
 
     it "returns an array of commands" do
-      expect(cmd_stager.generate(opts)).to_not be_empty
+      result = cmd_stager.generate(opts)
+
+      expect(result).to be_kind_of(Array)
+      expect(result).to_not be_empty
     end
   end
 
diff --git a/spec/lib/rex/exploitation/cmdstager/debug_write_spec.rb b/spec/lib/rex/exploitation/cmdstager/debug_write_spec.rb
index 6064f1d833..b70e228ada 100644
--- a/spec/lib/rex/exploitation/cmdstager/debug_write_spec.rb
+++ b/spec/lib/rex/exploitation/cmdstager/debug_write_spec.rb
@@ -8,8 +8,7 @@ describe Rex::Exploitation::CmdStagerDebugWrite do
   let(:exe) { "MZ" }
 
   subject(:cmd_stager) do
-    cmd_stager = Rex::Exploitation::CmdStagerDebugWrite.new(exe)
-    cmd_stager
+    described_class.new(exe)
   end
 
   describe '#cmd_concat_operator' do
@@ -26,7 +25,10 @@ describe Rex::Exploitation::CmdStagerDebugWrite do
     end
 
     it "returns an array of commands" do
-      expect(cmd_stager.generate(opts)).to_not be_empty
+      result = cmd_stager.generate(opts)
+
+      expect(result).to be_kind_of(Array)
+      expect(result).to_not be_empty
     end
   end
 
diff --git a/spec/lib/rex/exploitation/cmdstager/echo_spec.rb b/spec/lib/rex/exploitation/cmdstager/echo_spec.rb
index b5091e14a3..a3d91f2382 100644
--- a/spec/lib/rex/exploitation/cmdstager/echo_spec.rb
+++ b/spec/lib/rex/exploitation/cmdstager/echo_spec.rb
@@ -8,8 +8,7 @@ describe Rex::Exploitation::CmdStagerEcho do
   let(:exe) { "MZ" }
 
   subject(:cmd_stager) do
-    cmd_stager = Rex::Exploitation::CmdStagerEcho.new(exe)
-    cmd_stager
+    described_class.new(exe)
   end
 
   describe '#cmd_concat_operator' do
@@ -20,7 +19,10 @@ describe Rex::Exploitation::CmdStagerEcho do
 
   describe '#generate' do
     it "returns an array of commands" do
-      expect(cmd_stager.generate).to_not be_empty
+      result = cmd_stager.generate
+
+      expect(result).to be_kind_of(Array)
+      expect(result).to_not be_empty
     end
   end
 
diff --git a/spec/lib/rex/exploitation/cmdstager/printf_spec.rb b/spec/lib/rex/exploitation/cmdstager/printf_spec.rb
index 7db94c4468..02927f7ecb 100644
--- a/spec/lib/rex/exploitation/cmdstager/printf_spec.rb
+++ b/spec/lib/rex/exploitation/cmdstager/printf_spec.rb
@@ -8,8 +8,7 @@ describe Rex::Exploitation::CmdStagerPrintf do
   let(:exe) { "MZ" }
 
   subject(:cmd_stager) do
-    cmd_stager = Rex::Exploitation::CmdStagerPrintf.new(exe)
-    cmd_stager
+    described_class.new(exe)
   end
 
   describe '#cmd_concat_operator' do
@@ -20,7 +19,10 @@ describe Rex::Exploitation::CmdStagerPrintf do
 
   describe '#generate' do
     it "returns an array of commands" do
-      expect(cmd_stager.generate).to_not be_empty
+      result = cmd_stager.generate
+
+      expect(result).to be_kind_of(Array)
+      expect(result).to_not be_empty
     end
   end
 
diff --git a/spec/lib/rex/exploitation/cmdstager/tftp_spec.rb b/spec/lib/rex/exploitation/cmdstager/tftp_spec.rb
index 7dc0567ba0..813533fd4d 100644
--- a/spec/lib/rex/exploitation/cmdstager/tftp_spec.rb
+++ b/spec/lib/rex/exploitation/cmdstager/tftp_spec.rb
@@ -8,8 +8,7 @@ describe Rex::Exploitation::CmdStagerTFTP do
   let(:exe) { "MZ" }
 
   subject(:cmd_stager) do
-    cmd_stager = Rex::Exploitation::CmdStagerTFTP.new(exe)
-    cmd_stager
+    described_class.new(exe)
   end
 
   describe '#cmd_concat_operator' do
@@ -20,7 +19,10 @@ describe Rex::Exploitation::CmdStagerTFTP do
 
   describe '#generate' do
     it "returns an array of commands" do
-      expect(cmd_stager.generate).to_not be_empty
+      result = cmd_stager.generate
+
+      expect(result).to be_kind_of(Array)
+      expect(result).to_not be_empty
     end
   end
 
diff --git a/spec/lib/rex/exploitation/cmdstager/vbs_spec.rb b/spec/lib/rex/exploitation/cmdstager/vbs_spec.rb
index aef762c5d3..9b30c4cceb 100644
--- a/spec/lib/rex/exploitation/cmdstager/vbs_spec.rb
+++ b/spec/lib/rex/exploitation/cmdstager/vbs_spec.rb
@@ -8,8 +8,7 @@ describe Rex::Exploitation::CmdStagerVBS do
   let(:exe) { "MZ" }
 
   subject(:cmd_stager) do
-    cmd_stager = Rex::Exploitation::CmdStagerVBS.new(exe)
-    cmd_stager
+    described_class.new(exe)
   end
 
   describe '#cmd_concat_operator' do
@@ -26,7 +25,10 @@ describe Rex::Exploitation::CmdStagerVBS do
     end
 
     it "returns an array of commands" do
-      expect(cmd_stager.generate(opts)).to_not be_empty
+      result = cmd_stager.generate(opts)
+
+      expect(result).to be_kind_of(Array)
+      expect(result).to_not be_empty
     end
   end