Explain the use of Go's testing framework for writing and executing unit tests?

Go has a built-in testing framework that makes it easy to write and execute unit tests. Unit testing is an important part of software development as it helps to ensure that individual units or components of a program are working as expected.

To write a unit test in Go, you create a separate file with the **_test** suffix in the same package as the code you want to test. In this file, you create a function with the prefix **Test** and the name of the function you want to test, followed by any additional descriptive text you want to include. For example, if you want to test a function called **Add**, you might name your test function **TestAdd**.

Within the test function, you can use a variety of testing functions provided by the **testing** package to verify the behavior of the code you're testing. These functions include **t.Error**, **t.Fail**, **t.Logf**, and **t.Fatalf**.

Here's an example of a simple test for a function that adds two numbers:

package mymath

import "testing"

func TestAdd(t *testing.T) {
    result := Add(2, 3)
    if result != 5 {
        t.Errorf("Add(2, 3) = %d; expected 5", result)
    }
}

In this test, we're using the **Add** function from the **mymath** package to add two numbers, and then checking that the result is equal to 5. If the result is not equal to 5, we use the **t.Errorf** function to report an error.

To run the tests, you can use the **go test** command from the command line. This command will automatically search for any files ending in **_test.go** in your package, compile them, and run any functions with the **Test** prefix.

Overall, Go's testing framework makes it easy to write and run unit tests for your code, helping you to catch bugs and ensure that your code is working as expected.