Multi tool use

my ajax function somehow not covered by istanbul

I have a question I have this function

authAnonymous: function (callback) {
rest
.post(wso2config.token.host + "/" + wso2config.token.path, {
username: wso2config.clientId,
password: wso2config.clientSecret,
data: {
username: wso2config.anonymousUser.username,
password: wso2config.anonymousUser.password,
grant_type: "password",
redirect_uri: wso2config.redirect_uri,
scope: "somescope:thisisit"
}
})
.on("complete", function (data) {
if (data.error) callback(data, null);
else {
data.anonym = true;
callback(null, {
openid_data: data
});
}
});
},


so i want to code coverage this function and i make some unit test using Jest here's the unit test code

test("do login using authAnonymous", done => {
openID.authAnonymous(function (error, data) {
if (!error) {
expect(data.anonym).toBeTruthy();
} else {
//expect(data.anonym).toBe(false);
}
});
done();
});


somehow this unit test is working as I expected but code coverage says the statement is not covered

this says statement is not covered

as i understand my code works fine and unit test is working as expected why jest code coverage says this statement not covered can anyone explain how this statement covered works ? and why mine is not covered, i believe this is my fault but i don't know what to investigate here

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