public async Task InsertAsync_CallsInsertOneAsyncOnCollectionOnce_ThenReturnsEntityThatWasPassed()
{
//Arrange
//Create the BottleDomainModel that we will insert into the repo. This same entity should be returned by the method on a successful run.
var bottle = new BottleDomainModel {
BottleId = "507f1f77bcf86cd799439010", AlcoholCategory = AlcoholCategory.Whisky
};
var mockCollection = new Mock <IMongoCollection <BottleMongoModel> >();
_mockDbContext.SetupGet(c => c.Collection).Returns(mockCollection.Object);
var repo = new BottleMongoRepository(_mockDbContext.Object, _toMongoModelMapper, _toDomainModelMapper);
//Act
var result = await repo.InsertAsync(bottle);
//Assert
//Verify that the db context Collection's InsertoneAsync method is called exactly once.
//Any more or less will throw meaning the test will fail.
mockCollection.Verify(c => c.InsertOneAsync(
It.IsAny <BottleMongoModel>(),
It.IsAny <InsertOneOptions>(),
It.IsAny <CancellationToken>()), Times.Once());
Assert.AreEqual(bottle.BottleId, result.BottleId);
Assert.AreEqual(bottle.AlcoholCategory, result.AlcoholCategory);
}
public async Task InsertAsync_ReturnsNullWithoutTryingToInsertIntoCollection_WhenNullBottleDomainModelPassed()
{
//Arrange
//Set up the db context to throw if the Collection property is accessed. In this way we test that the InsertAsync method returns null without ever accessing the collection.
_mockDbContext.Setup(c => c.Collection).Throws(new System.Exception("Test failed. MongoDbContext Collection property was accessed. InsertAsync method should return null without accessing the Collection property."));
var repo = new BottleMongoRepository(_mockDbContext.Object, _toMongoModelMapper, _toDomainModelMapper);
//Act
var result = await repo.InsertAsync(null);
//Assert
Assert.IsNull(result);
}
