Add specs for all CLI flags

lib/mutant/cli.rb

@@ -66,7 +66,7 @@ module Mutant
     #
     def parse(arguments)
       opts = OptionParser.new do |builder|
-        builder.banner = 'usage: mutant STRATEGY [options] PATTERN ...'
+        builder.banner = 'usage: mutant [options] MATCH_EXPRESSION ...'
         %w[add_environment_options add_mutation_options add_filter_options add_debug_options].each do |name|
           send(name, builder)
         end
@@ -125,9 +125,6 @@ module Mutant
     def setup_integration(name)
       require "mutant/integration/#{name}"
       update(integration: Integration.lookup(name).new)
-    rescue LoadError
-      $stderr.puts("Cannot load plugin: #{name.inspect}")
-      raise
     end
 
     # Add options
@@ -177,12 +174,12 @@ module Mutant
         update(fail_fast: true)
       end.on('--version', 'Print mutants version') do
         puts("mutant-#{Mutant::VERSION}")
-        Kernel.exit(0)
+        Kernel.exit(EXIT_SUCCESS)
       end.on('-d', '--debug', 'Enable debugging output') do
         update(debug: true)
       end.on_tail('-h', '--help', 'Show this message') do
-        puts(opts)
+        puts(opts.to_s)
-        exit
+        Kernel.exit(EXIT_SUCCESS)
       end
     end
 

spec/unit/mutant/cli_spec.rb

@@ -69,6 +69,37 @@ describe Mutant::CLI do
       it_should_behave_like 'an invalid cli run'
     end
 
+    context 'with include help flag' do
+      let(:flags) { %w[--help] }
+
+      before do
+        expect($stdout).to receive(:puts).with(expected_message)
+        expect(Kernel).to receive(:exit).with(0)
+      end
+
+      it_should_behave_like 'a cli parser'
+
+      let(:expected_message) do
+        strip_indent(<<-MESSAGE)
+usage: mutant [options] MATCH_EXPRESSION ...
+Environment:
+        --zombie                     Run mutant zombified
+    -I, --include DIRECTORY          Add DIRECTORY to $LOAD_PATH
+    -r, --require NAME               Require file with NAME
+
+Options:
+        --score COVERAGE             Fail unless COVERAGE is not reached exactly
+        --use STRATEGY               Use STRATEGY for killing mutations
+        --ignore-subject PATTERN     Ignore subjects that match PATTERN
+        --code CODE                  Scope execution to subjects with CODE
+        --fail-fast                  Fail fast
+        --version                    Print mutants version
+    -d, --debug                      Enable debugging output
+    -h, --help                       Show this message
+        MESSAGE
+      end
+    end
+
     context 'with include flag' do
       let(:flags) { %w[--include foo] }
 
@@ -79,6 +110,35 @@ describe Mutant::CLI do
       end
     end
 
+    context 'with use flag' do
+      let(:flags) { %w[--use rspec] }
+
+      it_should_behave_like 'a cli parser'
+
+      let(:expected_integration) { Mutant::Integration::Rspec2.new }
+    end
+
+    context 'with version flag' do
+      let(:flags) { %w[--version] }
+
+      before do
+        expect(Kernel).to receive(:exit).with(0)
+        expect($stdout).to receive(:puts).with("mutant-#{Mutant::VERSION}")
+      end
+
+      it_should_behave_like 'a cli parser'
+    end
+
+    context 'with score flag' do
+      let(:flags) { %w[--score 99.5] }
+
+      it_should_behave_like 'a cli parser'
+
+      it 'configures expected coverage' do
+        expect(subject.config.expected_coverage).to eql(99.5)
+      end
+    end
+
     context 'with require flag' do
       let(:flags) { %w[--require foo] }
 
@@ -89,6 +149,26 @@ describe Mutant::CLI do
       end
     end
 
+    context 'with subject-ignore flag' do
+      let(:flags) { %w[--ignore-subject Foo::Bar] }
+
+      let(:expected_matcher_config) do
+        default_matcher_config.update(subject_ignores: [Mutant::Expression.parse('Foo::Bar')])
+      end
+
+      it_should_behave_like 'a cli parser'
+    end
+
+    context 'with fail-fast flag' do
+      let(:flags) { %w[--fail-fast] }
+
+      it_should_behave_like 'a cli parser'
+
+      it 'sets the fail fast option' do
+        expect(subject.config.fail_fast).to be(true)
+      end
+    end
+
     context 'with debug flag' do
       let(:flags) { %w[--debug] }