Truffle test fails with TypeError - solidity

Question

I have a very simple contract which works perfectly fine in remix editor.
I just wanted to learn truffle.I initiated an empty truffle project, placed the contract and get that compiled successfully.
however truffle test gives below error
Contract:
pragma solidity ^0.4.18;
contract Greetings{
string public message;
constructor() public {
message = "Hello";
}
function getGreeting() public view returns (string){
return message;
}
}
Test:
var Greetings = artifacts.require("Greetings");
contract('Greetings Test', async (accounts) => {
it("check for greetings message", async () => {
let greeting = await Greetings.deployed();
let message = await greeting.getGreeting().call();
console.log(message);
});
});
Error:
Contract: Greetings Test
1) check for greetings message
> No events were emitted
0 passing (103ms)
1 failing
1) Contract: Greetings Test
check for greetings message:
TypeError: greeting.getGreeting(...).call is not a function
at Context.it (test/campaignfactory.js:7:52)
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:188:7)
Note: I would like to use asnyc/await.

Answer 1

There is an error on the way you invoke the function. Either you use
let message = await greeting.getGreeting.call();
or
let message = await greeting.getGreeting()
You can't mix the syntax. When you call the method (eg getGreeting()) web3 will check whether is a call or a transaction and will use the right one for you. doc
In case you'd like to be explicit then you should use the fist way.