MS Graph Sample Application Integration Test not Working - microsoft-graph-api

Question

I want to do what the MS Graph sample node app is doing in its integrationTests.js, but that test doesn't work. Here's what I've tried:
Followed the quick start for creating a node.js app.
Ran the app. Ensured it worked by sending an e-mail.
Modified the test Checking that the sample can send an email to use my account parameters.
Tried to run the test. It fails with 403: insufficient scope. The call to get the token returned scopes, but lacked Mail.Send.
In the post data for the call to login.microsoftonline.com, I added "scope: 'Mail.Send'"
I still receive a valid token, and the return scope includes Mail.Send, but when I try to post with that token, I get 400: cannot POST /beta/me/sendMail
I tried adding scope (Mail.Send) in the query string and as a header (thought I saw that somewhere), but it made no difference.
I added the Mail.Send permission (under "Application Permissions") for the app in the application registration portal.
I compared the token (using https://jwt.ms) from my test call to the call from the app when it works. I see no real difference. They both contain the Mail.Send scope.
Here is the code (which is only slightly different from what's in the sample):
// in graphHelper.js
function postSendMail(accessToken, message, callback) {
request
.post('https://graph.microsoft.com/beta/me/sendMail')
//.post('https://graph.microsoft.com/beta/me/sendMail?scope=Mail.Send') // nope
.send(message)
.set('Authorization', 'Bearer ' + accessToken)
.set('Content-Type', 'application/json')
.set('Content-Length', message.length)
.set('scope', 'Mail.Send') // nope
.end((err, res) => {
callback(err, res);
});
}
describe('Integration', function () { // mocha
var accessToken;
var scope;
const config = getConfig();
// My account variables in testConfig.json file
function getConfig() {
var configFilePath = path.join(__dirname, 'testConfig.json');
return JSON.parse(fs.readFileSync(configFilePath, { encoding: 'utf8' }));
}
function getAccessToken(done) {
var postData = querystring.stringify(
{
grant_type: 'password',
//grant_type: 'client_id', // not supported
//grant_type: 'authorization_code', // This assumes you've requested an auth code.
resource: 'https://graph.microsoft.com/',
scope: 'Mail.Send',
client_id: config.test_client_id_v2,
client_secret: config.test_client_secret_v2,
username: config.test_username,
password: config.test_password
}
);
var postOptions = {
host: 'login.microsoftonline.com',
port: 443,
path: '/common/oauth2/token',
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': Buffer.byteLength(postData)
}
};
var postRequest = https.request(postOptions, function (res) {
var data = '';
res.setEncoding('utf8');
res.on('data', function (chunk) {
data += chunk;
});
res.on('end', function () {
const response = JSON.parse(data);
accessToken = response.access_token;
scope = response.scope;
done();
});
});
postRequest.on('error', function (e) {
console.log('Error: ' + e.message);
done(e);
});
postRequest.write(postData);
postRequest.end();
}
before( // eslint-disable-line no-undef
function (done) {
getAccessToken(done);
}
);
it('Checking that the sample can send an email',
function (done) {
var postBody = emailer.generateMailBody(config.test_name, config.test_username);
graphHelper.postSendMail(
accessToken, scope,
JSON.stringify(postBody),
function (error) {
assert(error === null, `The sample failed to send an email: ${error}`);
done();
});
}
);
});