set TEST_CLEAN_DATABASE when running server tests (#806)

After adding a batch of new server tests, some interactions between
tests have shown up via a shared database. This sets an existing flag
for dealing with this problem, that is used during browser tests but
hadn't been needed before for server tests.

test/gen-server/migrations.ts

@@ -5,6 +5,7 @@ import {HomeDBManager} from 'app/gen-server/lib/HomeDBManager';
 import {Permissions} from 'app/gen-server/lib/Permissions';
 import {assert} from 'chai';
 import {addSeedData, createInitialDb, removeConnection, setUpDB} from 'test/gen-server/seed';
+import {EnvironmentSnapshot} from 'test/server/testUtils';
 
 import {Initial1536634251710 as Initial} from 'app/gen-server/migration/1536634251710-Initial';
 import {Login1539031763952 as Login} from 'app/gen-server/migration/1539031763952-Login';
@@ -63,11 +64,19 @@ function assertMembersGroup(org: Organization, exists: boolean) {
 }
 
 describe('migrations', function() {
+  let oldEnv: EnvironmentSnapshot;
 
   before(function() {
+    oldEnv = new EnvironmentSnapshot();
+    // This test is incompatible with TEST_CLEAN_DATABASE.
+    delete process.env.TEST_CLEAN_DATABASE;
     setUpDB(this);
   });
 
+  after(function() {
+    oldEnv.restore();
+  });
+
   beforeEach(async function() {
     await home.connect();
     await createInitialDb(home.connection, false);

test/server/lib/DocApi.ts

@@ -37,7 +37,6 @@ import {signal} from 'test/server/lib/helpers/Signal';
 import {TestServer} from 'test/server/lib/helpers/TestServer';
 import * as testUtils from 'test/server/testUtils';
 import {waitForIt} from 'test/server/wait';
-import clone = require('lodash/clone');
 import defaultsDeep = require('lodash/defaultsDeep');
 import pick = require('lodash/pick');
 
@@ -71,9 +70,11 @@ let userApi: UserAPIImpl;
 describe('DocApi', function () {
   this.timeout(30000);
   testUtils.setTmpLogLevel('error');
-  const oldEnv = clone(process.env);
+  let oldEnv: testUtils.EnvironmentSnapshot;
 
   before(async function () {
+    oldEnv = new testUtils.EnvironmentSnapshot();
+
     // Clear redis test database if redis is in use.
     if (process.env.TEST_REDIS_URL) {
       const cli = createClient(process.env.TEST_REDIS_URL);
@@ -94,7 +95,7 @@ describe('DocApi', function () {
   });
 
   after(() => {
-    Object.assign(process.env, oldEnv);
+    oldEnv.restore();
   });
 
   /**

test/server/lib/UnhandledErrors.ts

@@ -1,6 +1,7 @@
 import {prepareDatabase} from 'test/server/lib/helpers/PrepareDatabase';
 import {TestServer} from 'test/server/lib/helpers/TestServer';
 import {createTestDir, setTmpLogLevel} from 'test/server/testUtils';
+import * as testUtils from 'test/server/testUtils';
 import {waitForIt} from 'test/server/wait';
 import {assert} from 'chai';
 import fetch from 'node-fetch';
@@ -17,12 +18,18 @@ describe('UnhandledErrors', function() {
   setTmpLogLevel('warn');
 
   let testDir: string;
+  let oldEnv: testUtils.EnvironmentSnapshot;
 
   before(async function() {
+    oldEnv = new testUtils.EnvironmentSnapshot();
     testDir = await createTestDir('UnhandledErrors');
     await prepareDatabase(testDir);
   });
 
+  after(function() {
+    oldEnv.restore();
+  });
+
   for (const errType of ['exception', 'rejection', 'error-event']) {
     it(`should clean up on unhandled ${errType}`, async function() {
       // Capture server log output, so that we can look to see how the server coped.

test/server/lib/Webhooks-Proxy.ts

@@ -14,7 +14,6 @@ import {signal} from 'test/server/lib/helpers/Signal';
 import {TestProxyServer} from 'test/server/lib/helpers/TestProxyServer';
 import {TestServer} from 'test/server/lib/helpers/TestServer';
 import * as testUtils from 'test/server/testUtils';
-import clone = require('lodash/clone');
 
 const chimpy = configForUser('Chimpy');
 
@@ -39,12 +38,12 @@ async function cleanRedisDatabase() {
 }
 
 function backupEnvironmentVariables() {
-  let oldEnv: NodeJS.ProcessEnv;
+  let oldEnv: testUtils.EnvironmentSnapshot;
   before(() => {
-    oldEnv = clone(process.env);
+    oldEnv = new testUtils.EnvironmentSnapshot();
   });
   after(() => {
-    Object.assign(process.env, oldEnv);
+    oldEnv.restore();
   });
 }