Test private functions.MD

Java

• Reflection
• Change modifier to protected and put tests into same place

Go

/github.com/example/mypackage.go
                   /mypackage_internal_test.go                   

Rust

fn private_function() {
}

#[test]
fn test_private_function() {
    private_function()
}

Javascript

No private/public, do whatever you want

Elixir

- have faith in your unit tests: when they test the public api of your module they also test the private api
- write more tests for your public api, have you covered all scenarios ?
- extract your private api to its own module, most functions should become public and testable

Python

• subclassing the class to expose access
• tricks with runtime introspective features

C#

• Reflection or other access modifier tricks similar to Java

C++

• Friend access modifer
• macro
• subclassing
• refactor to separate file and expose interfaces

Ruby

• Send (dynamic dispatch)