Add test for UnlockedCryptoService

Brings the test coverage for the cryptoservice package from 54.5% to
72.3% (based only on tests inside the package).

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

cryptoservice/unlocked_crypto_service_test.go

@@ -0,0 +1,45 @@
+package cryptoservice
+
+import (
+	"crypto/rand"
+	"crypto/x509"
+	"testing"
+
+	"github.com/docker/notary/trustmanager"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestUnlockedSigner(t *testing.T) {
+	privKey, err := trustmanager.GenerateECDSAKey(rand.Reader)
+	assert.NoError(t, err, "could not generate key")
+
+	keyStore := trustmanager.NewKeyMemoryStore()
+
+	passphrase := "passphrase"
+	err = keyStore.AddEncryptedKey(privKey.ID(), privKey, passphrase)
+	assert.NoError(t, err, "could not add key to store")
+
+	cryptoService := NewCryptoService("", keyStore, passphrase)
+	uCryptoService := NewUnlockedCryptoService(privKey, cryptoService)
+
+	// Check ID method
+	assert.Equal(t, privKey.ID(), uCryptoService.ID())
+
+	// Check Public method
+	assert.Equal(t, privKey.Public(), uCryptoService.PublicKey().Public())
+	assert.Equal(t, privKey.ID(), uCryptoService.PublicKey().ID())
+
+	// Check GenerateCertificate method
+	gun := "docker.com/notary"
+	cert, err := uCryptoService.GenerateCertificate(gun)
+	assert.NoError(t, err, "could not generate certificate")
+
+	// Check public key
+	ecdsaPrivateKey, err := x509.ParseECPrivateKey(privKey.Private())
+	assert.NoError(t, err)
+	ecdsaPublicKey := ecdsaPrivateKey.Public()
+	assert.Equal(t, ecdsaPublicKey, cert.PublicKey)
+
+	// Check CommonName
+	assert.Equal(t, cert.Subject.CommonName, gun)
+}