tinyrand-alloc 0.5.0

Extensions for using tinyrand with alloc.
Documentation 
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use crate::{Mock, counter, echo, fixed};
use alloc::rc::Rc;
use core::cell::RefCell;
use tinyrand::{Probability, Rand, RandLim, RefCellExt};

#[test]
fn mock_counter() {
    let mut mock = Mock::default().with_next_u128(counter(5..8));
    assert_eq!(0, mock.state().next_u128_invocations());
    assert_eq!(5, mock.next_u16());
    assert_eq!(1, mock.state().next_u128_invocations());
    assert_eq!(6, mock.next_u32());
    assert_eq!(2, mock.state().next_u128_invocations());
    assert_eq!(7, mock.next_u64());
    assert_eq!(3, mock.state().next_u128_invocations());
    assert_eq!(5, mock.next_u128());
    assert_eq!(4, mock.state().next_u128_invocations());
    assert_eq!(6, mock.next_usize());
    assert_eq!(5, mock.state().next_u128_invocations());
}

#[test]
fn next_bool() {
    let mut mock = Mock::default()
        .with_next_u128(fixed(0))
        .with_next_bool(|_, _| true);
    assert_eq!(0, mock.state().next_bool_invocations());
    assert!(mock.next_bool(Probability::new(0.0))); // absurd but true (because of test_mock)
    assert_eq!(1, mock.state().next_bool_invocations());
    assert!(mock.next_bool(Probability::new(0.5)));
    assert_eq!(2, mock.state().next_bool_invocations());
    assert!(mock.next_bool(Probability::new(1.0)));
    assert_eq!(3, mock.state().next_bool_invocations());

    let mut mock = Mock::default()
        .with_next_u128(fixed(0))
        .with_next_bool(|_, _| false);
    assert_eq!(0, mock.state().next_bool_invocations());
    assert!(!mock.next_bool(Probability::new(1.0))); // again, only possible thanks to mocking
    assert_eq!(1, mock.state().next_bool_invocations());
}

#[test]
fn next_bool_delegates_by_default() {
    let cell = RefCell::default();
    let mut mock = Mock::default().with_next_u128(echo(&cell));
    assert_eq!(0, mock.state().next_bool_invocations());
    assert_eq!(0, mock.state().next_u128_invocations());
    assert!(!mock.next_bool(Probability::new(0.0)));
    assert!(mock.next_bool(Probability::new(0.5)));
    assert!(mock.next_bool(Probability::new(1.0)));
    assert_eq!(3, mock.state().next_bool_invocations());
    assert_eq!(3, mock.state().next_u128_invocations());

    cell.set(u128::MAX);
    assert!(!mock.next_bool(Probability::new(0.0)));
    assert!(!mock.next_bool(Probability::new(0.5)));
    assert!(mock.next_bool(Probability::new(1.0)));
    assert_eq!(6, mock.state().next_bool_invocations());
    assert_eq!(6, mock.state().next_u128_invocations());
}

#[test]
fn next_lim() {
    let mut mock = Mock::default()
        .with_next_u128(fixed(0))
        .with_next_lim_u128(|_, lim| lim / 2);
    assert_eq!(0, mock.state().next_lim_u128_invocations());
    assert_eq!(21, mock.next_lim_u16(42));
    assert_eq!(1, mock.state().next_lim_u128_invocations());
    assert_eq!(21, mock.next_lim_u32(42));
    assert_eq!(21, mock.next_lim_u64(42));
    assert_eq!(21, mock.next_lim_u128(42));
    assert_eq!(21, mock.next_lim_usize(42));
    assert_eq!(5, mock.state().next_lim_u128_invocations());
    assert_eq!(21, mock.next_lim(42u16));
    assert_eq!(21, mock.next_lim(42u32));
    assert_eq!(21, mock.next_lim(42u64));
    assert_eq!(21, mock.next_lim(42u128));
    assert_eq!(21, mock.next_lim(42usize));
    assert_eq!(10, mock.state().next_lim_u128_invocations());
}

#[test]
fn next_lim_delegates_by_default() {
    let cell = Rc::new(RefCell::default());
    let mut mock = Mock::default().with_next_u128(echo(&cell));
    assert_eq!(0, mock.state().next_lim_u128_invocations());
    assert_eq!(0, mock.next_lim_u16(1));
    assert_eq!(1, mock.state().next_lim_u128_invocations());
    assert_eq!(0, mock.next_lim_u32(1));
    assert_eq!(0, mock.next_lim_u64(1));
    assert_eq!(0, mock.next_lim_u128(1));
    assert_eq!(0, mock.next_lim_usize(1));
    assert_eq!(5, mock.state().next_lim_u128_invocations());
    assert_eq!(0, mock.next_lim(1u16));
    assert_eq!(0, mock.next_lim(1u32));
    assert_eq!(0, mock.next_lim(1u64));
    assert_eq!(0, mock.next_lim(1u128));
    assert_eq!(0, mock.next_lim(1usize));
    assert_eq!(10, mock.state().next_lim_u128_invocations());
}

#[test]
fn state_from_surrogate() {
    let mut mock = Mock::default().with_next_bool(|surrogate, _| {
        assert_eq!(0, surrogate.state().next_bool_invocations());
        true
    });
    assert!(mock.next_bool(Probability::new(0.5)));
    assert_eq!(1, mock.state().next_bool_invocations());

    mock = mock.with_next_bool(|surrogate, _| {
        assert_eq!(1, surrogate.state().next_bool_invocations());
        true
    });
    assert!(mock.next_bool(Probability::new(0.5)));
    assert_eq!(2, mock.state().next_bool_invocations());
}