1 files changed, 77 insertions, 0 deletions
diff --git a/test/unit/app/controllers/transactions/tx-gas-util-test.js b/test/unit/app/controllers/transactions/tx-gas-util-test.js
new file mode 100644
index 000000000..d1ee86033
--- /dev/null
+++ b/test/unit/app/controllers/transactions/tx-gas-util-test.js
@@ -0,0 +1,77 @@
+const assert = require('assert')
+const Transaction = require('ethereumjs-tx')
+const BN = require('bn.js')
+
+
+const { hexToBn, bnToHex } = require('../../../../../app/scripts/lib/util')
+const TxUtils = require('../../../../../app/scripts/controllers/transactions/tx-gas-utils')
+
+
+describe('txUtils', function () {
+  let txUtils
+
+  before(function () {
+    txUtils = new TxUtils(new Proxy({}, {
+      get: (obj, name) => {
+        return () => {}
+      },
+    }))
+  })
+
+  describe('chain Id', function () {
+    it('prepares a transaction with the provided chainId', function () {
+      const txParams = {
+        to: '0x70ad465e0bab6504002ad58c744ed89c7da38524',
+        from: '0x69ad465e0bab6504002ad58c744ed89c7da38525',
+        value: '0x0',
+        gas: '0x7b0c',
+        gasPrice: '0x199c82cc00',
+        data: '0x',
+        nonce: '0x3',
+        chainId: 42,
+      }
+      const ethTx = new Transaction(txParams)
+      assert.equal(ethTx.getChainId(), 42, 'chainId is set from tx params')
+    })
+  })
+
+  describe('addGasBuffer', function () {
+    it('multiplies by 1.5, when within block gas limit', function () {
+      // naive estimatedGas: 0x16e360 (1.5 mil)
+      const inputHex = '0x16e360'
+      // dummy gas limit: 0x3d4c52 (4 mil)
+      const blockGasLimitHex = '0x3d4c52'
+      const output = txUtils.addGasBuffer(inputHex, blockGasLimitHex)
+      const inputBn = hexToBn(inputHex)
+      const outputBn = hexToBn(output)
+      const expectedBn = inputBn.muln(1.5)
+      assert(outputBn.eq(expectedBn), 'returns 1.5 the input value')
+    })
+
+    it('uses original estimatedGas, when above block gas limit', function () {
+      // naive estimatedGas: 0x16e360 (1.5 mil)
+      const inputHex = '0x16e360'
+      // dummy gas limit: 0x0f4240 (1 mil)
+      const blockGasLimitHex = '0x0f4240'
+      const output = txUtils.addGasBuffer(inputHex, blockGasLimitHex)
+      // const inputBn = hexToBn(inputHex)
+      const outputBn = hexToBn(output)
+      const expectedBn = hexToBn(inputHex)
+      assert(outputBn.eq(expectedBn), 'returns the original estimatedGas value')
+    })
+
+    it('buffers up to recommend gas limit recommended ceiling', function () {
+      // naive estimatedGas: 0x16e360 (1.5 mil)
+      const inputHex = '0x16e360'
+      // dummy gas limit: 0x1e8480 (2 mil)
+      const blockGasLimitHex = '0x1e8480'
+      const blockGasLimitBn = hexToBn(blockGasLimitHex)
+      const ceilGasLimitBn = blockGasLimitBn.muln(0.9)
+      const output = txUtils.addGasBuffer(inputHex, blockGasLimitHex)
+      // const inputBn = hexToBn(inputHex)
+      // const outputBn = hexToBn(output)
+      const expectedHex = bnToHex(ceilGasLimitBn)
+      assert.equal(output, expectedHex, 'returns the gas limit recommended ceiling value')
+    })
+  })
+})