CODEWITHSUNDEEP
c#asp.net-coremoqxunit.net
aman
aman

Reputation: 6262

.Net Core Moq: An expression tree may not contain a call or invocation that uses optional arguments

Using .net core xunit and moq.

While writing my test case, I am getting the error"

An expression tree may not contain a call or invocation that uses optional arguments

The error is on line:

var moqDb = new Mock<IDynamoDbClientInitialization>();
moqDb
 .Setup(_ => _.GetContext().ScanAsync<MyModel>
 (It.IsAny<List<ScanCondition>>(), AWSHelperMethods.GetDynamoDbOperationConfig(dynamoDbTable)).GetRemainingAsync())
.ReturnsAsync(data);

For full code for this one can refer the post at: .Net core testing with Xunit

Could anyone help resolving my error here.

This post is for resolving the error I am getting, not asking for writing the unit case

Upvotes: 2

Views: 5050

Answers (1)

svoychik
svoychik

Reputation: 1327

moqDb is intance of Mock:

moqDb
 .Setup(_ => _.GetContext().ScanAsync<MyModel>

In this part of the code you trying to "call" a method ScanAsync on not already set up GetContext(). To solve this you have to Setup return value for GetContext() before you tried to Setup ScanAsync()

Upvotes: 1

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