So you would write test cases for all the methods and constructors for a class like this:

  class Foo{
    public Foo(initialValue) {
        this.value = initialValue
    }
  
    public setValue(value) {
        this.value = value
    }
  
    public getValue() {
        return this.value;
    }
  }

What's the point, what are you testing? That the language's most basic operations still work?