¿Cómo te burlas de una base de datos en funcionamiento?

How do you mock a database in go?

Here is a sample function that uses the database to do something.

1. func SaveUserToDB(db *sql.
2. func (db *sql.
3. type SQLDB interface { Exec(query string, args
4. type MockDB struct {} // Implement the SQLDB interface func (mdb *MockDB) Exec(query string, args …

There are two ways which we can use to mock the database connection. The first one is by mocking the java. sql classes itself and the second way is by mocking the Data Access Objects (DAO) classes which talks to the database. First we will see how we can mock the java.

Installation

1. Docker. Use the Docker image docker pull vektra/mockery.
2. Homebrew. Install through brew brew install mockery brew upgrade mockery.
3. go get. Alternatively, you can use the go get method: go get github.com/vektra/mockery/v2/…/
4. Example.

The third and very important reason for mocking DB is: It allows us to write tests that achieve 100% coverage. With a mock DB, we can easily set up and test some edge cases, such as an unexpected error, or a connection lost, which would be impossible to achieve if we use a real DB.

sqlmock is a mock library implementing sql/driver. Which has one and only purpose to simulate any sql driver behavior in tests, without needing a real database connection. It helps to maintain correct TDD workflow.

To implement an interface in Go, we just need to implement all the methods in the interface. Here we implement geometry on rect s. The implementation for circle s. If a variable has an interface type, then we can call methods that are in the named interface.

DataSource mockedDataSrc = Mockito. mock(DataSource. class); customerClassDao. setJdbcTemplate(mockedDataSrc);

Mockery: a useful code generator for mocking Golang interfaces

1. To install: go get github.com/vektra/mockery/…/
2. A simple example: suppose we have an interface named Example. Run the command mockery -name=Example to get the output in mocks/Example.go .
3. To mock a behavior of an interface: mockExample = &mocks.Example{}

Database Mocking is a technique that allows you to set the desired database state (for different tables) in your tests to let specific data-sets ready for future test execution. In other words, Database Mocking is a simulation of a database with few records.

Visit godoc for general examples and public api reference. See .travis.yml for supported go versions. Different use case, is to functionally test with a real database go-txdb all database related actions are isolated within a single transaction so the database can remain in the same state. See implementation examples:

Imagine writing that fake. Throw in Entity Framework to the mix and you have an interesting issue. While Entity Framework helps you with the development of your models, it can also be a problem mocking up the DbContext, DbSets, and repositories for all of your tables.

We have now implemented the QueryMatcher interface, which can be passed through an option when calling sqlmock.New or sqlmock.NewWithDSN. This now allows to include some library, which would allow for example to parse and validate mysql SQL AST. And create a custom QueryMatcher in order to validate SQL in sophisticated ways.

Mockito offers two equivalent ways of mocking: Using @Mock annotations. All the examples in this article use static methods. Feel free to use annotations instead, but make sure that you agree on a single solution with the rest of your team, so that unit tests are written in a common format.