add rspec test

journald-native.gemspec

@@ -24,4 +24,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler', '~> 1.6'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rake-compiler'
+  spec.add_development_dependency 'rspec', '~> 3.4'
 end

spec/journald_native_spec.rb

@@ -0,0 +1,43 @@
+require_relative 'spec_helper'
+
+# I don't know how to mock inside the C extension so just call real journal methods
+
+RSpec.describe Journald::Native do
+  describe 'sends log entries' do
+    it 'calls send()' do
+      expect(
+          Journald::Native.send(
+              "PRIORITY=#{Journald::LOG_DEBUG}",
+              'MESSAGE=test send()',
+              'SOMEFIELD=some value'
+          )
+      ).to eq(0)
+    end
+
+    it 'calls print()' do
+      expect(Journald::Native.print Journald::LOG_DEBUG, 'test print()').to eq(0)
+    end
+
+    it 'calls perror()' do
+      expect(Journald::Native.perror 'test perror()').to eq(0)
+    end
+
+    it 'calls send() with \0 symbol' do
+      expect(
+          Journald::Native.send(
+              "PRIORITY=#{Journald::LOG_DEBUG}",
+              "MESSAGE=test\0send() with zero",
+              "SOMEFIELD=some value\0with zero"
+          )
+      ).to eq(0)
+    end
+
+    it 'fails on print() with \0 symbol' do
+      expect{ Journald::Native.print Journald::LOG_DEBUG, "test print()\0with zero" }.to raise_error(ArgumentError, 'string contains null byte')
+    end
+
+    it 'fails on perror() with \0 symbol' do
+      expect{ Journald::Native.perror "test perror()\0with zero" }.to raise_error(ArgumentError, 'string contains null byte')
+    end
+  end
+end

spec/spec_helper.rb

@@ -0,0 +1 @@
+require_relative '../lib/journald/native'