1 files changed, 30 insertions, 0 deletions
diff --git a/test/unit/tx-controller-test.js b/test/unit/tx-controller-test.js
index 0b5c7226a..ddd921652 100644
--- a/test/unit/tx-controller-test.js
+++ b/test/unit/tx-controller-test.js
@@ -40,6 +40,36 @@ describe('Transaction Controller', function () {
     txController.nonceTracker.getNonceLock = () => Promise.resolve({ nextNonce: 0, releaseLock: noop })
   })
 
+  describe('#isNonceTaken', function () {
+    it('should return true', function (done) {
+      txController.txStateManager._saveTxList([
+        { id: 1, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+        { id: 2, status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+        { id: 3, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+      ])
+      txController.isNonceTaken({txParams: {nonce:0, from:'0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'}})
+      .then((isNonceTaken) => {
+        assert(isNonceTaken)
+        done()
+      }).catch(done)
+
+    })
+    it('should return false', function (done) {
+      txController.txStateManager._saveTxList([
+        { id: 1, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+        { id: 2, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+        { id: 3, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+      ])
+
+      txController.isNonceTaken({txParams: {nonce:0, from:'0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'}})
+      .then((isNonceTaken) => {
+        assert(!isNonceTaken)
+        done()
+      }).catch(done)
+
+    })
+  })
+
   describe('#getState', function () {
     it('should return a state object with the right keys and datat types', function () {
       const exposedState = txController.getState()