diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..715bb59
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,8 @@
+language: go
+
+go:
+  - "1.12"
+
+env:
+  - GO111MODULE=on
+
diff --git a/README.md b/README.md
index c9fc804..18d67c0 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
-# cryptofun [![Go Report Card](https://goreportcard.com/badge/github.com/arnaucube/cryptofun)](https://goreportcard.com/report/github.com/arnaucube/cryptofun)
+# cryptofun [![Go Report Card](https://goreportcard.com/badge/github.com/arnaucube/cryptofun)](https://goreportcard.com/report/github.com/arnaucube/cryptofun) [![Build Status](https://travis-ci.org/arnaucube/cryptofun.svg?branch=master)](https://travis-ci.org/arnaucube/cryptofun)
+
 
 Crypto algorithms from scratch. Academic purposes only.
 
diff --git a/paillier/paillier_test.go b/paillier/paillier_test.go
index 3a4598d..c7de28c 100644
--- a/paillier/paillier_test.go
+++ b/paillier/paillier_test.go
@@ -24,8 +24,22 @@ func TestEncryptDecrypt(t *testing.T) {
 }
 
 func TestHomomorphicAddition(t *testing.T) {
-	key, err := GenerateKeyPair()
-	assert.Nil(t, err)
+	// key, err := GenerateKeyPair()
+	// assert.Nil(t, err)
+
+	// key harcoded for tests
+	pubK := PublicKey{
+		N: big.NewInt(204223),
+		G: big.NewInt(24929195694),
+	}
+	privK := PrivateKey{
+		Lambda: big.NewInt(101660),
+		Mu:     big.NewInt(117648),
+	}
+	key := Key{
+		PubK:  pubK,
+		PrivK: privK,
+	}
 
 	n1 := big.NewInt(int64(110))
 	n2 := big.NewInt(int64(150))