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Testing Cosmos DB Operations in .NET

Cosmos DB is a highly scalable NoSQL database provided by Microsoft Azure. Unit testing is an essential part of software development, as it ensures the quality of the codebase. In this tutorial, we will learn how to perform unit testing for Cosmos DB operations in .NET applications.

Syntax

The syntax for unit testing Cosmos DB operations in .NET is as follows:

[TestClass]
public class CosmosDbTests
{
    private readonly string _cosmosConnectionString = "cosmos-connection-string";
    private readonly string _databaseName = "database-name";
    private readonly string _containerName = "container-name";

    [TestMethod]
    public async Task TestGetItemAsync()
    {
        using var client = new CosmosClient(_cosmosConnectionString);
        var database = client.GetDatabase(_databaseName);
        var container = database.GetContainer(_containerName);

        var item = new Item
        {
            Id = "1",
            Name = "Test Item"
        };

        await container.CreateItemAsync(item, new PartitionKey(item.Id));
        var result = await container.ReadItemAsync<Item>(item.Id, new PartitionKey(item.Id));

        Assert.AreEqual(item.Id, result.Resource.Id);
    }
}

public class Item
{
    [JsonProperty(PropertyName = "id")]
    public string Id { get; set; }

    [JsonProperty(PropertyName = "name")]
    public string Name { get; set; }
}

Example

Let's take an example to understand how to test Cosmos DB operations in .NET applications. We will create a test method to retrieve an item from the Cosmos DB container, and then we will perform some assertions on the retrieved item.

[TestClass]
public class CosmosDbTests
{
    private readonly string _cosmosConnectionString = "cosmos-connection-string";
    private readonly string _databaseName = "database-name";
    private readonly string _containerName = "container-name";

    [TestMethod]
    public async Task TestGetItemAsync()
    {
        using var client = new CosmosClient(_cosmosConnectionString);
        var database = client.GetDatabase(_databaseName);
        var container = database.GetContainer(_containerName);

        var item = new Item
        {
            Id = "1",
            Name = "Test Item"
        };

        await container.CreateItemAsync(item, new PartitionKey(item.Id));
        var result = await container.ReadItemAsync<Item>(item.Id, new PartitionKey(item.Id));

        Assert.AreEqual(item.Id, result.Resource.Id);
    }
}

public class Item
{
    [JsonProperty(PropertyName = "id")]
    public string Id { get; set; }

    [JsonProperty(PropertyName = "name")]
    public string Name { get; set; }
}

Output

When we run the above test method, it should retrieve the item from the Cosmos DB container and perform the assertions on the retrieved item. If all assertions pass successfully, then the test method will be marked as passed.

Explanation

In the above example, we have written a unit test method named "TestGetItemAsync" to retrieve an item from the Cosmos DB container. We have created the CosmosClient object using the Cosmos connection string. Then we have retrieved the database and container using their respective names.

Next, we have created an instance of the Item class and set its properties. After that, we have added the item to the container using the CreateItemAsync method. Then we have retrieved the item using the ReadItemAsync method and performed some assertions on the retrieved item.

Finally, we have used the Assert class to perform the assertions. If all assertions pass successfully, the test method will be marked as passed.

Use

We can use these unit test methods to ensure that our Cosmos DB operations are working as expected. These tests enable us to identify any issues or bugs in the codebase before deploying the application in the production environment.

Important Points

  • Unit testing ensures the quality of the codebase.
  • Cosmos DB is a highly scalable NoSQL database provided by Microsoft Azure.
  • We can use the CosmosClient class to interact with Cosmos DB in .NET applications.
  • Unit testing Cosmos DB operations in .NET applications is essential to ensure the correctness of the codebase.
  • We can use the CosmosClient and Container classes to perform database operations and retrieve data from Cosmos DB.
  • We can use the Assert class to perform assertions on retrieved data and ensure the correctness of the data.

Summary

In this tutorial, we have learned how to perform unit testing for Cosmos DB operations in .NET applications. We have seen how to create unit test methods to retrieve data from the Cosmos DB container and perform assertions on the retrieved data. We have also discussed the importance of unit testing and how it ensures the quality of the codebase.

Data ValidationMocking Cosmos DB for Unit Testing
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