Mocking helps in testing individual components of a system by replacing _______ dependencies with mocks.
- Concrete
- Concrete
- External
- Real
Mocking replaces real dependencies with mock objects, which simulate the behavior of real dependencies. This separation allows for more controlled testing of individual components without the need to involve external dependencies.
In a Go application, you encounter a circular import error. How would you refactor your code to resolve this issue?
- Extract the common functionality causing the circular import into a new package
- Rename packages to break the circular dependency
- Reorder the import statements
- Use blank imports to ignore the circular dependency
Extracting the common functionality causing the circular import into a new package is a common approach to resolve circular dependencies in Go. Reordering import statements or renaming packages may not effectively address the root cause of the circular dependency and could lead to further issues. Using blank imports to ignore circular dependencies is not a recommended practice as it can obscure the code and make it harder to understand.
The '_______' function in Go unit testing is used to indicate a failed test and stop executing subsequent tests.
- Error()
- Fail()
- Fatal()
- Stop()
In Go unit testing, the Fatal() function is used to indicate a failed test and stop executing subsequent tests. When a test fails with Fatal(), it means that the test cannot continue because of the failure.
An interface in Go is a collection of _______.
- data types
- functions
- methods
- variables
In Go, an interface is defined as a collection of method signatures. It specifies what methods a type must have to implement that interface, but it does not contain any implementation itself. This enables polymorphism in Go, allowing different types to be treated interchangeably if they satisfy the interface contract.
In a Go web server, what would be the consequence of calling 'panic()' when handling an HTTP request?
- The HTTP request will be abruptly terminated, and the server will return a 500 Internal Server Error.
- The server will gracefully handle the panic, allowing the request to complete before terminating.
- The server will ignore the panic and continue processing the request.
- The server will panic and crash, bringing down all active connections and terminating the process.
Calling 'panic()' during an HTTP request handling will cause the server to panic and crash. This abrupt termination can lead to a cascading failure, affecting all active connections and potentially causing downtime. It's crucial to handle errors gracefully in HTTP servers to ensure stability and reliability. The 'panic()' function is typically reserved for exceptional situations where immediate termination is necessary, such as unrecoverable errors.
What is a recommended practice for naming test functions in Go?
- Begin with 'test_' prefix
- Begin with lowercase letter
- Use CamelCase notation with 'Test' prefix
- Use descriptive names without prefixes
In Go, a recommended practice for naming test functions is to use CamelCase notation with a 'Test' prefix. This convention helps to clearly identify test functions from regular functions, making the codebase more readable and maintaining consistency across test suites.
Using '_______', one can recover from a panic and resume control, but it won't restore the stack to the point of the original panic.
- catch()
- defer()
- handle()
- recover()
In Go, the 'recover()' function is used to regain control of a goroutine that is panicking. However, it won't restore the stack to the point of the original panic. Instead, it only stops the panic and returns the value passed to 'panic()'.
Which data type in Go is used to represent a single Unicode character?
- byte
- char
- rune
- string
In Go, the rune data type is used to represent a single Unicode character. Runes are based on the UTF-8 encoding scheme and allow developers to work with individual characters in Unicode strings. The rune type is synonymous with int32 and provides Unicode support.
You're designing a library in Go for handling geometric shapes. Would you implement methods for calculating the area of shapes like circles and rectangles? Why or why not?
- No, it increases code complexity.
- No, it violates the principle of separation of concerns.
- Yes, it provides convenience for users.
- Yes, to ensure consistent implementation across shapes.
Implementing methods for calculating area directly within geometric shape structs would violate the principle of separation of concerns, as the responsibility for calculating area does not strictly belong to the shape itself. Instead, a separate package or utility function should be provided for calculating the area of various shapes, promoting modularity and maintainability in the codebase. This approach also prevents redundancy and reduces code complexity by adhering to the single responsibility principle.
How does Go determine if two maps are equal?
- By comparing their keys and values, By comparing their lengths, By comparing their types, By comparing their elements
- By comparing their keys and values, By comparing their memory addresses, By comparing their sizes, By comparing their lengths
- By comparing their keys and values, By comparing their types, By comparing their elements, By comparing their lengths
- By comparing their sizes, By comparing their types, By comparing their elements, By comparing their values
In Go, two maps are considered equal if they have the same set of keys and values. When comparing maps for equality, Go checks whether they have identical key-value pairs. If both maps have the same keys associated with the same values, they are considered equal. This behavior is essential when working with maps in Go, ensuring correct comparison semantics.