diff --git a/packages/vvisp-utils/test/getPrivateKey.test.js b/packages/vvisp-utils/test/getPrivateKey.test.js
index b5df42d..d732171 100644
--- a/packages/vvisp-utils/test/getPrivateKey.test.js
+++ b/packages/vvisp-utils/test/getPrivateKey.test.js
@@ -58,15 +58,12 @@ describe('# getPrivateKey test', function() {
     });
   });
   describe('private key enable', function() {
-    const mnemonic = process.env.MNEMONIC;
     const private_key = process.env.PRIVATE_KEY;
     before(function() {
-      delete process.env.MNEMONIC;
       process.env.PRIVATE_KEY =
         '9741fa712a6912b862c9043f8752ffae513cb01895985998c61620da5aaf2d2d';
     });
     after(function() {
-      process.env.MNEMONIC = mnemonic;
       process.env.PRIVATE_KEY = private_key;
     });
     it('should pass when private key given', function() {
@@ -74,10 +71,7 @@ describe('# getPrivateKey test', function() {
       result.should.equal(process.env.PRIVATE_KEY);
     });
     it('should return private key instead of mnemonic', function() {
-      const result = getPrivateKey(
-        'piano garage flag neglect spare title drill basic strong aware enforce fury',
-        3
-      );
+      const result = getPrivateKey(MNEMONIC, 3);
       result.should.equal(process.env.PRIVATE_KEY);
     });
   });
diff --git a/packages/vvisp/test/scripts/deploy-contract.test.js b/packages/vvisp/test/scripts/deploy-contract.test.js
index c480613..e5f5232 100644
--- a/packages/vvisp/test/scripts/deploy-contract.test.js
+++ b/packages/vvisp/test/scripts/deploy-contract.test.js
@@ -21,15 +21,22 @@ describe('# deploy contract process test', function() {
       .fulfilled;
   });
 
-  it('should deploy one contract through private key', async () => {
-    process.env.PRIVATE_KEY =
-      '9741fa712a6912b862c9043f8752ffae513cb01895985998c61620da5aaf2d2d';
-    process.env.MNEMONIC = '';
-    await deployContract(CONTRACT_PATH, [], { silent: true }).should.be
-      .fulfilled;
-    process.env.PRIVATE_KEY = '';
-    process.env.MNEMONIC =
-      'piano garage flag neglect spare title drill basic strong aware enforce fury';
+  describe('private key', function() {
+    const mnemonic = process.env.MNEMONIC;
+    const private_key = process.env.PRIVATE_KEY;
+    before(function() {
+      process.env.PRIVATE_KEY =
+        '9741fa712a6912b862c9043f8752ffae513cb01895985998c61620da5aaf2d2d';
+      delete process.env.MNEMONIC;
+    });
+    after(function() {
+      process.env.MNEMONIC = mnemonic;
+      process.env.PRIVATE_KEY = private_key;
+    });
+    it.only('should deploy one contract through private key', async () => {
+      await deployContract(CONTRACT_PATH, [], { silent: true }).should.be
+        .fulfilled;
+    });
   });
 
   it('should deploy two contract', async () => {