Added smoketest for our exclusion list.

This queries the leveldb file directly and spot checks a few known includes/excludes.

Auditors: @mrose17, @bbondy, @alexwykoff

Test Plan:
1. Make sure you have latest npm packages installed (from this PR)
2. In window 1, run `npm run watch-all`.
3. In window 2, run LEDGER_VERBOSE=1 LEDGER_RULES_TESTING=1 npm start`
4. Wait for ledger to finish downloading the entries (took me 6 minutes, may take more/less)
5. When finished, close the browser
6. In window 2, run `npm run test -- --grep="smoketest for our exclusion list"`

test/taxonomy/exclusionListTest.js

@@ -0,0 +1,125 @@
+/* global describe, it, before */
+
+/* jshint asi: true, node: true, laxbreak: true, laxcomma: true, undef: true, unused: true */
+const levelup = require('level')
+const assert = require('assert')
+
+const includes = (db, domain, done) => {
+  db.get('domain:' + domain, function (err, value) {
+    assert.equal(!!err, true)
+    done()
+  })
+}
+
+const excludes = (db, domain, done) => {
+  db.get('domain:' + domain, function (err, value) {
+    if (err) throw err
+    const parsedValue = JSON.parse(value)
+    assert.equal(parsedValue && parsedValue.exclude, true)
+    done()
+  })
+}
+
+const excludesSubdomain = (db, subdomain, done) => {
+  db.get('SLD:' + subdomain, function (err, value) {
+    if (err) throw err
+    const parsedValue = JSON.parse(value)
+    assert.equal(parsedValue && parsedValue.exclude, true)
+    done()
+  })
+}
+
+const excludesTLD = (db, tld, done) => {
+  db.get('TLD:' + tld, function (err, value) {
+    if (err) throw err
+    const parsedValue = JSON.parse(value)
+    assert.equal(parsedValue && parsedValue.exclude, true)
+    done()
+  })
+}
+
+const waitForDownload = (db, done) => {
+  const entries = []
+
+  db.createKeyStream()
+  .on('data', function (data) {
+    entries.push(data)
+  }).on('error', function (err) {
+    throw err
+  }).on('end', function () {
+    if (entries.length === 0) {
+      const err = 'No entries found in leveldb;\n' +
+        'manually run `LEDGER_VERBOSE=1 LEDGER_RULES_TESTING=1 npm start` and wait for all entries to download\n' +
+        '(takes about 6 minutes).\n' +
+        'If running in CI, make a test case that just sleeps for 10 minutes and run prior to this.'
+      throw err
+    }
+    done()
+  })
+}
+
+let dbHandle
+
+// https://github.com/Level/levelup
+
+describe('smoketest for our exclusion list', function () {
+  before(function (done) {
+    // TODO(bsclifton): only works on macOS at the moment
+    const filepath =
+      require('os').homedir() +
+      '/Library/Application Support' +
+      '/brave-development/ledger-rulesV2.leveldb'
+
+    levelup(filepath,
+      {},
+      function (err, db) {
+        if (err) throw err
+        dbHandle = db
+
+        // TODO: wait until the DB has entries
+        waitForDownload(db, done)
+      })
+  })
+
+  describe('includes', function () {
+    it('brianbondy.com', function (done) {
+      includes(dbHandle, 'brianbondy.com', done)
+    })
+    it('clifton.io', function (done) {
+      includes(dbHandle, 'clifton.io', done)
+    })
+    it('coindesk.com', function (done) {
+      includes(dbHandle, 'coindesk.com', done)
+    })
+    it('cnn.com', function (done) {
+      includes(dbHandle, 'cnn.com', done)
+    })
+    it('cnet.com', function (done) {
+      includes(dbHandle, 'cnet.com', done)
+    })
+    it('Hacker News', function (done) {
+      includes(dbHandle, 'news.ycombinator.com', done)
+    })
+  })
+
+  describe('excludes', function () {
+    it('bankofamerica.com', function (done) {
+      excludes(dbHandle, 'bankofamerica.com', done)
+    })
+    it('brave.com', function (done) {
+      excludes(dbHandle, 'brave.com', done)
+    })
+    it('Facebook', function (done) {
+      excludesSubdomain(dbHandle, 'facebook', done)
+    })
+    it('.gov TLD', function (done) {
+      excludesTLD(dbHandle, 'gov', done)
+    })
+    it('Google', function (done) {
+      excludesSubdomain(dbHandle, 'google', done)
+    })
+    it('walmart.com', function (done) {
+      excludes(dbHandle, 'walmart.com', done)
+    })
+  })
+})