Add rspec test for Class['postgresql::java'].

This test conforms to the rspec-puppet and puppetlabs_spec_helper
standards.

spec/classes/postgresql_java_spec.rb

@@ -0,0 +1,50 @@
+require 'spec_helper'
+
+describe 'postgresql::java' do
+
+  describe 'on a debian based os' do
+    let :facts do {
+      :osfamily                 => 'Debian',
+      :postgres_default_version => 'foo',
+    }
+    end
+    it { should contain_package('postgresql-jdbc').with(
+      :name   => 'libpostgresql-jdbc-java',
+      :ensure => 'present'
+    )}
+  end
+
+  describe 'on a redhat based os' do
+    let :facts do {
+      :osfamily                 => 'RedHat',
+      :postgres_default_version => 'foo',
+    }
+    end
+    it { should contain_package('postgresql-jdbc').with(
+      :name   => 'postgresql-jdbc',
+      :ensure => 'present'
+    )}
+    describe 'when parameters are supplied' do
+      let :params do
+        {:package_ensure => 'latest', :package_name => 'java-postgresql'}
+      end
+      it { should contain_package('postgresql-jdbc').with(
+        :name   => 'java-postgresql',
+        :ensure => 'latest'
+      )}
+    end
+  end
+
+  describe 'on any other os' do
+    let :facts do {
+      :osfamily                 => 'foo',
+      :postgres_default_version => 'foo',
+    }
+    end
+
+    it 'should fail' do
+      expect { subject }.to raise_error(/Unsupported osfamily: foo/)
+    end
+  end
+
+end