1 files changed, 106 insertions, 0 deletions
diff --git a/ui/app/components/send_/tests/send-utils.test.js b/ui/app/components/send_/tests/send-utils.test.js
index 903b531e6..b5211a63d 100644
--- a/ui/app/components/send_/tests/send-utils.test.js
+++ b/ui/app/components/send_/tests/send-utils.test.js
@@ -1,6 +1,13 @@
 import assert from 'assert'
 import sinon from 'sinon'
 import proxyquire from 'proxyquire'
+import {
+  ONE_GWEI_IN_WEI_HEX,
+} from '../send.constants'
+const {
+  addCurrencies,
+  subtractCurrencies,
+} = require('../../../conversion-util')
 
 const {
   INSUFFICIENT_FUNDS_ERROR,
@@ -31,7 +38,9 @@ const sendUtils = proxyquire('../send.utils.js', {
 
 const {
   calcGasTotal,
+  estimateGas,
   doesAmountErrorRequireUpdate,
+  estimateGasPriceFromRecentBlocks,
   generateTokenTransferData,
   getAmountErrorObject,
   getParamsForGasEstimate,
@@ -261,4 +270,101 @@ describe('send utils', () => {
     })
   })
 
+  describe('estimateGas', () => {
+    let tempEthQuery
+    beforeEach(() => {
+      tempEthQuery = global.ethQuery
+      global.ethQuery = {
+        estimateGas: sinon.stub().callsFake((data, cb) => {
+          return cb(
+            data.isMockErr ? 'mockErr' : null,
+            Object.assign(data, { estimateGasCalled: true })
+          )
+        })
+      }
+    })
+
+    afterEach(() => {
+      global.ethQuery = tempEthQuery
+    })
+
+    it('should call ethQuery.estimateGas and resolve that call\'s data', async () => {
+      const result = await estimateGas({ mockParam: 'someData' })
+      assert.equal(global.ethQuery.estimateGas.callCount, 1)
+      assert.deepEqual(
+        result,
+        { mockParam: 'someData', estimateGasCalled: true }
+      )
+    })
+
+    it('should reject with ethQuery.estimateGas error', async () => {
+      try {
+        await estimateGas({ mockParam: 'someData', isMockErr: true })
+      } catch (err) {
+        assert.equal(err, 'mockErr')
+      }
+    })
+  })
+
+  describe('estimateGasPriceFromRecentBlocks', () => {
+    const ONE_GWEI_IN_WEI_HEX_PLUS_ONE = addCurrencies(ONE_GWEI_IN_WEI_HEX, '0x1', {
+      aBase: 16,
+      bBase: 16,
+      toNumericBase: 'hex',
+    })
+    const ONE_GWEI_IN_WEI_HEX_PLUS_TWO = addCurrencies(ONE_GWEI_IN_WEI_HEX, '0x2', {
+      aBase: 16,
+      bBase: 16,
+      toNumericBase: 'hex',
+    })
+    const ONE_GWEI_IN_WEI_HEX_MINUS_ONE = subtractCurrencies(ONE_GWEI_IN_WEI_HEX, '0x1', {
+      aBase: 16,
+      bBase: 16,
+      toNumericBase: 'hex',
+    })
+
+    it(`should return ${ONE_GWEI_IN_WEI_HEX} if recentBlocks is falsy`, () => {
+      assert.equal(estimateGasPriceFromRecentBlocks(), ONE_GWEI_IN_WEI_HEX)
+    })
+
+    it(`should return ${ONE_GWEI_IN_WEI_HEX} if recentBlocks is empty`, () => {
+      assert.equal(estimateGasPriceFromRecentBlocks([]), ONE_GWEI_IN_WEI_HEX)
+    })
+
+    it(`should estimate a block's gasPrice as ${ONE_GWEI_IN_WEI_HEX} if it has no gas prices`, () => {
+      const mockRecentBlocks = [
+        { gasPrices: null },
+        { gasPrices: [ ONE_GWEI_IN_WEI_HEX_PLUS_ONE ] },
+        { gasPrices: [ ONE_GWEI_IN_WEI_HEX_MINUS_ONE ] },
+      ]
+      assert.equal(estimateGasPriceFromRecentBlocks(mockRecentBlocks), ONE_GWEI_IN_WEI_HEX)
+    })
+
+    it(`should estimate a block's gasPrice as ${ONE_GWEI_IN_WEI_HEX} if it has empty gas prices`, () => {
+      const mockRecentBlocks = [
+        { gasPrices: [] },
+        { gasPrices: [ ONE_GWEI_IN_WEI_HEX_PLUS_ONE ] },
+        { gasPrices: [ ONE_GWEI_IN_WEI_HEX_MINUS_ONE ] },
+      ]
+      assert.equal(estimateGasPriceFromRecentBlocks(mockRecentBlocks), ONE_GWEI_IN_WEI_HEX)
+    })
+
+    it(`should return the middle value of all blocks lowest prices`, () => {
+      const mockRecentBlocks = [
+        { gasPrices: [ ONE_GWEI_IN_WEI_HEX_PLUS_TWO ] },
+        { gasPrices: [ ONE_GWEI_IN_WEI_HEX_MINUS_ONE ] },
+        { gasPrices: [ ONE_GWEI_IN_WEI_HEX_PLUS_ONE ] },
+      ]
+      assert.equal(estimateGasPriceFromRecentBlocks(mockRecentBlocks), ONE_GWEI_IN_WEI_HEX_PLUS_ONE)
+    })
+
+    it(`should work if a block has multiple gas prices`, () => {
+      const mockRecentBlocks = [
+        { gasPrices: [ '0x1', '0x2', '0x3', '0x4', '0x5' ] },
+        { gasPrices: [ '0x101', '0x100', '0x103', '0x104', '0x102' ] },
+        { gasPrices: [ '0x150', '0x50', '0x100', '0x200', '0x5' ] },
+      ]
+      assert.equal(estimateGasPriceFromRecentBlocks(mockRecentBlocks), '0x5')
+    })
+  })
 })