From 86e26240a1995eac85178c277a227d75221077f6 Mon Sep 17 00:00:00 2001
From: Fabio Berger <me@fabioberger.com>
Date: Sun, 4 Mar 2018 15:52:16 +0100
Subject: Add `numberOfAccounts` param to `LedgerSubprovider` method
 `getAccountsAsync` and add tests

---
 packages/subproviders/src/subproviders/ledger.ts               |  6 +++---
 .../subproviders/test/integration/ledger_subprovider_test.ts   | 10 ++++++++--
 packages/subproviders/test/unit/ledger_subprovider_test.ts     |  8 +++++++-
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/packages/subproviders/src/subproviders/ledger.ts b/packages/subproviders/src/subproviders/ledger.ts
index 5966a88bb..85cdf0efc 100644
--- a/packages/subproviders/src/subproviders/ledger.ts
+++ b/packages/subproviders/src/subproviders/ledger.ts
@@ -19,7 +19,7 @@ import {
 import { Subprovider } from './subprovider';
 
 const DEFAULT_DERIVATION_PATH = `44'/60'/0'`;
-const NUM_ADDRESSES_TO_FETCH = 10;
+const DEFAULT_NUM_ADDRESSES_TO_FETCH = 10;
 const ASK_FOR_ON_DEVICE_CONFIRMATION = false;
 const SHOULD_GET_CHAIN_CODE = true;
 
@@ -129,7 +129,7 @@ export class LedgerSubprovider extends Subprovider {
                 return;
         }
     }
-    public async getAccountsAsync(): Promise<string[]> {
+    public async getAccountsAsync(numberOfAccounts: number = DEFAULT_NUM_ADDRESSES_TO_FETCH): Promise<string[]> {
         this._ledgerClientIfExists = await this._createLedgerClientAsync();
 
         let ledgerResponse;
@@ -148,7 +148,7 @@ export class LedgerSubprovider extends Subprovider {
         hdKey.chainCode = new Buffer(ledgerResponse.chainCode, 'hex');
 
         const accounts = [];
-        for (let i = 0; i < NUM_ADDRESSES_TO_FETCH; i++) {
+        for (let i = 0; i < numberOfAccounts; i++) {
             const derivedHDNode = hdKey.derive(`m/${i + this._derivationPathIndex}`);
             const derivedPublicKey = derivedHDNode.publicKey;
             const shouldSanitizePublicKey = true;
diff --git a/packages/subproviders/test/integration/ledger_subprovider_test.ts b/packages/subproviders/test/integration/ledger_subprovider_test.ts
index 628b532d7..e17ededee 100644
--- a/packages/subproviders/test/integration/ledger_subprovider_test.ts
+++ b/packages/subproviders/test/integration/ledger_subprovider_test.ts
@@ -26,11 +26,17 @@ describe('LedgerSubprovider', () => {
         });
     });
     describe('direct method calls', () => {
-        it('returns a list of accounts', async () => {
+        it('returns defaut number of accounts', async () => {
             const accounts = await ledgerSubprovider.getAccountsAsync();
             expect(accounts[0]).to.not.be.an('undefined');
             expect(accounts.length).to.be.equal(10);
         });
+        it('returns requested number of accounts', async () => {
+            const numberOfAccounts = 20;
+            const accounts = await ledgerSubprovider.getAccountsAsync(numberOfAccounts);
+            expect(accounts[0]).to.not.be.an('undefined');
+            expect(accounts.length).to.be.equal(numberOfAccounts);
+        });
         it('signs a personal message', async () => {
             const data = ethUtils.bufferToHex(ethUtils.toBuffer('hello world'));
             const ecSignatureHex = await ledgerSubprovider.signPersonalMessageAsync(data);
@@ -172,7 +178,7 @@ describe('LedgerSubprovider', () => {
                 };
                 const callback = reportCallbackErrors(done)((err: Error, response: Web3.JSONRPCResponsePayload) => {
                     expect(err).to.be.a('null');
-                    const result = response.result.result;
+                    const result = response.result;
                     expect(result.length).to.be.equal(66);
                     expect(result.substr(0, 2)).to.be.equal('0x');
                     done();
diff --git a/packages/subproviders/test/unit/ledger_subprovider_test.ts b/packages/subproviders/test/unit/ledger_subprovider_test.ts
index 1c70dd3a6..6c589dffe 100644
--- a/packages/subproviders/test/unit/ledger_subprovider_test.ts
+++ b/packages/subproviders/test/unit/ledger_subprovider_test.ts
@@ -62,11 +62,17 @@ describe('LedgerSubprovider', () => {
     });
     describe('direct method calls', () => {
         describe('success cases', () => {
-            it('returns a list of accounts', async () => {
+            it('returns defaut number of accounts', async () => {
                 const accounts = await ledgerSubprovider.getAccountsAsync();
                 expect(accounts[0]).to.be.equal(FAKE_ADDRESS);
                 expect(accounts.length).to.be.equal(10);
             });
+            it('returns requested number of accounts', async () => {
+                const numberOfAccounts = 20;
+                const accounts = await ledgerSubprovider.getAccountsAsync(numberOfAccounts);
+                expect(accounts[0]).to.be.equal(FAKE_ADDRESS);
+                expect(accounts.length).to.be.equal(numberOfAccounts);
+            });
             it('signs a personal message', async () => {
                 const data = ethUtils.bufferToHex(ethUtils.toBuffer('hello world'));
                 const ecSignatureHex = await ledgerSubprovider.signPersonalMessageAsync(data);
-- 
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