add spec for cli

spec/json_cli/cli_spec.rb

@@ -0,0 +1,68 @@
+require 'spec_helper'
+require 'tempfile'
+
+describe JsonCli::CLI do
+  let(:cli) { described_class.new }
+
+  shared_examples_for 'cli' do
+    before do
+      @result_file = Tempfile.new(File.basename(__FILE__))
+    end
+
+    after do
+      @result_file.close!
+    end
+
+    it 'output expected JSON' do
+      args.map! { |f| File.join(FIXTURE_DIR, f) }
+      options.merge!(output: @result_file.path)
+      cli.invoke(command, args, options)
+      expect_file_path = File.join(FIXTURE_DIR, expect_file)
+      expect(File.read(@result_file.path)).to eq File.read(expect_file_path)
+    end
+  end
+
+  context 'join' do
+    describe '#left_join' do
+      let(:args) { %w(attribute.json logfile.json) }
+      let(:options) { { join_key: '_id' } }
+      let(:command) { 'left_join' }
+      let(:expect_file) { 'join_logfile_attribute_id.json' }
+      it_behaves_like 'cli'
+    end
+
+    describe '#right_join' do
+      let(:args) { %w(logfile.json attribute.json) }
+      let(:options) { { join_key: '_id' } }
+      let(:command) { 'right_join' }
+      let(:expect_file) { 'join_logfile_attribute_id.json' }
+      it_behaves_like 'cli'
+    end
+
+    describe '#inner_join' do
+      let(:args) { %w(attribute.json logfile.json) }
+      let(:options) { { join_key: '_id' } }
+      let(:command) { 'inner_join' }
+      let(:expect_file) { 'inner_join_logfile_attribute_id.json' }
+      it_behaves_like 'cli'
+    end
+  end
+
+  context 'unwind' do
+    describe '#unwind_array' do
+      let(:args) { %w(logfile.json) }
+      let(:options) { { unwind_key: 'tags' } }
+      let(:command) { 'unwind_array' }
+      let(:expect_file) { 'unwind_logfile_tags.json' }
+      it_behaves_like 'cli'
+    end
+
+    describe '#unwind_hash' do
+      let(:args) { %w(logfile.json) }
+      let(:options) { { unwind_key: 'words' } }
+      let(:command) { 'unwind_hash' }
+      let(:expect_file) { 'unwind_logfile_words.json' }
+      it_behaves_like 'cli'
+    end
+  end
+end