Technical debt for universe package

- added unit tests

universe/SolarSystemExtension_test.go

@@ -0,0 +1,51 @@
+package universe
+
+import (
+	"math/rand"
+	"time"
+
+	check "gopkg.in/check.v1"
+)
+
+type SolarSystemExtensionTestSuite struct {
+	id              Id
+	constellationId Id
+	regionId        Id
+	galaxyId        GalaxyId
+	location        Location
+	security        TrueSecurity
+
+	system    SolarSystem
+	extension *SolarSystemExtension
+}
+
+var _ = check.Suite(&SolarSystemExtensionTestSuite{})
+
+func (suite *SolarSystemExtensionTestSuite) SetUpTest(c *check.C) {
+	random := rand.New(rand.NewSource(time.Now().UnixNano()))
+
+	suite.id = Id(random.Int63())
+	suite.constellationId = Id(random.Int63())
+	suite.regionId = Id(random.Int63())
+	suite.galaxyId = GalaxyId(random.Int63())
+	suite.location = NewSpecificLocation(random.Float64(), random.Float64(), random.Float64())
+	suite.security = TrueSecurity((random.Intn(201) - 100) / 100.0)
+
+	suite.system = newSolarSystem(suite.id, suite.constellationId, suite.regionId, suite.galaxyId, suite.location, suite.security)
+	suite.extension = &SolarSystemExtension{newSolarSystemExtensionData(suite.system)}
+}
+func (suite *SolarSystemExtensionTestSuite) TestIdReturnsSolarSystemId(c *check.C) {
+	c.Assert(suite.extension.Id(), check.Equals, suite.id)
+}
+
+func (suite *SolarSystemExtensionTestSuite) TestGalaxyIdReturnsGalaxyId(c *check.C) {
+	c.Assert(suite.extension.GalaxyId(), check.Equals, suite.galaxyId)
+}
+
+func (suite *SolarSystemExtensionTestSuite) TestLocationReturnsLocation(c *check.C) {
+	c.Assert(suite.extension.Location(), check.Equals, suite.location)
+}
+
+func (suite *SolarSystemExtensionTestSuite) TestSecurityReturnsSecurity(c *check.C) {
+	c.Assert(suite.extension.Security(), check.Equals, suite.security)
+}