diff --git a/.rubocop.yml b/.rubocop.yml
index dd16d44..813b2c4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -3,3 +3,6 @@ Style/Documentation:
 
 Metrics:
   Enabled: false
+
+FileName:
+  Enabled: false
diff --git a/sensu-plugins-trello.gemspec b/sensu-plugins-trello.gemspec
index 1d98f7d..037fceb 100644
--- a/sensu-plugins-trello.gemspec
+++ b/sensu-plugins-trello.gemspec
@@ -24,4 +24,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec', '~> 3.7'
   spec.add_development_dependency 'rubocop', '~> 0.54'
+  spec.add_development_dependency 'webmock', '~> 3.3'
 end
diff --git a/test/check-trello-incidents_spec.rb b/test/check-trello-incidents_spec.rb
new file mode 100644
index 0000000..8abad12
--- /dev/null
+++ b/test/check-trello-incidents_spec.rb
@@ -0,0 +1,44 @@
+require 'json'
+require 'webmock/rspec'
+
+require_relative './plugin_stub.rb'
+require_relative '../bin/check-trello-incidents.rb'
+
+describe CheckTrelloIncidents do
+  before(:each) do
+    @api = stub_request(
+      :get,
+      'https://api.trello.com//1/lists/abcde/cards/?key=12345&token=12345'
+    )
+
+    @check = CheckTrelloIncidents.new
+    @check.config[:api_key] = '12345'
+    @check.config[:api_token] = '12345'
+    @check.config[:list] = 'abcde'
+
+    allow(@check).to receive(:output)
+  end
+
+  it 'should run' do
+    @api.to_return(body: '[]', status: 200)
+
+    expect { @check.run }.to raise_error do |error|
+      expect(error).to be_a SystemExit
+      expect(error.status).to eq 0
+    end
+    expect(@check).to have_received(:output).with('No new incidents')
+    expect(@api).to have_been_requested
+  end
+
+  it 'should be critical if trello cards' do
+    cards = [{ id: '1a2b3c', name: 'foo' }, { id: '1x2y3z', name: 'bar' }]
+    @api.to_return(body: JSON.generate(cards), status: 200)
+
+    expect { @check.run }.to raise_error do |error|
+      expect(error).to be_a SystemExit
+      expect(error.status).to eq 2
+    end
+    expect(@check).to have_received(:output).with('foo; bar')
+    expect(@api).to have_been_requested
+  end
+end
diff --git a/test/plugin_stub.rb b/test/plugin_stub.rb
new file mode 100644
index 0000000..379e0b5
--- /dev/null
+++ b/test/plugin_stub.rb
@@ -0,0 +1,24 @@
+RSpec.configure do |c|
+  c.before { allow($stdout).to receive(:puts) }
+  c.before { allow($stderr).to receive(:puts) }
+
+  # XXX: Sensu plugins run in the context of an at_exit handler. This prevents
+  # XXX: code-under-test from being run at the end of the rspec suite.
+  c.before(:each) do
+    Sensu::Plugin::CLI.class_eval do
+      # PluginStub
+      class PluginStub
+        def run; end
+
+        def ok(*); end
+
+        def warning(*); end
+
+        def critical(*); end
+
+        def unknown(*); end
+      end
+      class_variable_set(:@@autorun, PluginStub)
+    end
+  end
+end