diff --git a/spec/lib/mina/runner/exec_spec.rb b/spec/lib/mina/runner/exec_spec.rb
new file mode 100644
index 00000000..2b3f2a7b
--- /dev/null
+++ b/spec/lib/mina/runner/exec_spec.rb
@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe Mina::Runner::Exec do
+  subject(:runner) { described_class.new('echo hello') }
+
+  describe '#run' do
+    before do
+      allow(Kernel).to receive(:exec)
+      expect_any_instance_of(Kernel).to receive(:exec).with('echo hello')
+    end
+
+    it 'executes the script' do
+      runner.run
+    end
+  end
+end
diff --git a/spec/lib/mina/runner/printer_spec.rb b/spec/lib/mina/runner/printer_spec.rb
new file mode 100644
index 00000000..bb6b1f75
--- /dev/null
+++ b/spec/lib/mina/runner/printer_spec.rb
@@ -0,0 +1,17 @@
+require 'spec_helper'
+
+describe Mina::Runner::Printer do
+  subject(:runner) { described_class.new('echo hello') }
+
+  describe '#run' do
+    it 'prints the script to stdout' do
+      expect do
+        runner.run
+      end.to output("echo hello\n").to_stdout
+    end
+
+    it 'returns true', :suppressed_output do
+      expect(runner.run).to eq(true)
+    end
+  end
+end
diff --git a/spec/lib/mina/runner/system_spec.rb b/spec/lib/mina/runner/system_spec.rb
new file mode 100644
index 00000000..29057e27
--- /dev/null
+++ b/spec/lib/mina/runner/system_spec.rb
@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe Mina::Runner::System do
+  subject(:runner) { described_class.new('echo hello') }
+
+  describe '#run' do
+    before do
+      allow(Kernel).to receive(:system)
+      expect_any_instance_of(Kernel).to receive(:system).with('echo hello')
+    end
+
+    it 'executes the script' do
+      runner.run
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 3c3e1379..aa975657 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -31,4 +31,13 @@
   config.after(:all, type: :rake) do
     Mina::Configuration.instance.remove :simulate
   end
+
+  config.around(:each, :suppressed_output) do |example|
+    original_stdout, $stdout = $stdout, File.open(File::NULL, 'w')
+    original_stderr, $stderr = $stderr, File.open(File::NULL, 'w')
+
+    example.run
+
+    $stdout, $stderr = original_stdout, original_stderr
+  end
 end