diff --git a/spec/nmap_spec.rb b/spec/nmap_spec.rb
new file mode 100644
index 0000000..70c630d
--- /dev/null
+++ b/spec/nmap_spec.rb
@@ -0,0 +1,56 @@
+require 'spec_helper'
+require 'ronin/nmap'
+
+RSpec.describe Ronin::Nmap do
+  describe '.scan' do
+    let(:targets) { '192.168.1.*' }
+
+    context 'if tartets is empty' do
+      it 'must raise an ArgumentError' do
+        expect {
+          subject.scan
+        }.to raise_error(ArgumentError, 'must specify at least one target')
+      end
+    end
+
+    context 'if sudo is not a Hash, true, false, nor nil' do
+      it 'must raise an ArgumentError' do
+        expect {
+          subject.scan(targets, sudo: 'sudo')
+        }.to raise_error(ArgumentError, 'sudo keyword must be a Hash, true, false, or nil')
+      end
+    end
+
+    context 'when nmap command was successfull' do
+      let(:expected_output_filename) { %r{#{Ronin::Nmap::CACHE_DIR}\/nmap[^.]+\.xml} }
+
+      before do
+        allow(Kernel).to receive(:system).with({}, 'nmap', '-oX', match(expected_output_filename), targets).and_return(true)
+      end
+
+      it 'must return false' do
+        expect(subject.scan(targets).class).to be(Nmap::XML)
+      end
+    end
+
+    context 'when nmap command fails' do
+      before do
+        allow(Kernel).to receive(:system).with({}, 'nmap', '-oX', anything, targets).and_return(false)
+      end
+
+      it 'must return false' do
+        expect(subject.scan(targets)).to be(false)
+      end
+    end
+
+    context 'when nmap command is not installed' do
+      before do
+        allow(Kernel).to receive(:system).with({}, 'nmap', '-oX', anything, targets).and_return(nil)
+      end
+
+      it 'must return nil' do
+        expect(subject.scan(targets)).to be(nil)
+      end
+    end
+  end
+end