truecalc-core 0.6.0

Spreadsheet formula engine — parser and evaluator for Excel-compatible formulas
Documentation 
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use super::super::isbetween_fn;
use crate::types::{ErrorKind, Value};

// ── inclusive bounds (defaults) ───────────────────────────────────────────────

#[test]
fn value_within_range_returns_true() {
    // ISBETWEEN(3, 1, 5) → true
    assert_eq!(
        isbetween_fn(&[Value::Number(3.0), Value::Number(1.0), Value::Number(5.0)]),
        Value::Bool(true)
    );
}

#[test]
fn value_at_lower_bound_inclusive_returns_true() {
    // ISBETWEEN(1, 1, 5) → true (inclusive lower bound by default)
    assert_eq!(
        isbetween_fn(&[Value::Number(1.0), Value::Number(1.0), Value::Number(5.0)]),
        Value::Bool(true)
    );
}

#[test]
fn value_at_upper_bound_inclusive_returns_true() {
    // ISBETWEEN(5, 1, 5) → true (inclusive upper bound by default)
    assert_eq!(
        isbetween_fn(&[Value::Number(5.0), Value::Number(1.0), Value::Number(5.0)]),
        Value::Bool(true)
    );
}

#[test]
fn value_below_lower_bound_returns_false() {
    // ISBETWEEN(0, 1, 5) → false
    assert_eq!(
        isbetween_fn(&[Value::Number(0.0), Value::Number(1.0), Value::Number(5.0)]),
        Value::Bool(false)
    );
}

#[test]
fn value_above_upper_bound_returns_false() {
    // ISBETWEEN(6, 1, 5) → false
    assert_eq!(
        isbetween_fn(&[Value::Number(6.0), Value::Number(1.0), Value::Number(5.0)]),
        Value::Bool(false)
    );
}

// ── exclusive lower bound ─────────────────────────────────────────────────────

#[test]
fn value_at_lower_bound_exclusive_returns_false() {
    // ISBETWEEN(1, 1, 5, FALSE) → false (exclusive lower bound)
    assert_eq!(
        isbetween_fn(&[
            Value::Number(1.0),
            Value::Number(1.0),
            Value::Number(5.0),
            Value::Bool(false),
        ]),
        Value::Bool(false)
    );
}

// ── exclusive upper bound ─────────────────────────────────────────────────────

#[test]
fn value_at_upper_bound_exclusive_returns_false() {
    // ISBETWEEN(5, 1, 5, TRUE, FALSE) → false (exclusive upper bound)
    assert_eq!(
        isbetween_fn(&[
            Value::Number(5.0),
            Value::Number(1.0),
            Value::Number(5.0),
            Value::Bool(true),
            Value::Bool(false),
        ]),
        Value::Bool(false)
    );
}

// ── arity errors ──────────────────────────────────────────────────────────────

#[test]
fn too_few_args_returns_na_error() {
    assert_eq!(
        isbetween_fn(&[Value::Number(3.0), Value::Number(1.0)]),
        Value::Error(ErrorKind::NA)
    );
}

#[test]
fn too_many_args_returns_na_error() {
    assert_eq!(
        isbetween_fn(&[
            Value::Number(3.0),
            Value::Number(1.0),
            Value::Number(5.0),
            Value::Bool(true),
            Value::Bool(true),
            Value::Bool(true),
        ]),
        Value::Error(ErrorKind::NA)
    );
}

// ── type error paths ──────────────────────────────────────────────────────────

#[test]
fn non_numeric_first_arg_returns_value_error() {
    // ISBETWEEN("text", 1, 10) → #VALUE!
    assert_eq!(
        isbetween_fn(&[
            Value::Text("text".to_string()),
            Value::Number(1.0),
            Value::Number(10.0),
        ]),
        Value::Error(ErrorKind::Value)
    );
}

#[test]
fn non_boolean_fourth_arg_returns_value_error() {
    // ISBETWEEN(5, 1, 10, "bad") → #VALUE!
    assert_eq!(
        isbetween_fn(&[
            Value::Number(5.0),
            Value::Number(1.0),
            Value::Number(10.0),
            Value::Text("bad".to_string()),
        ]),
        Value::Error(ErrorKind::Value)
    );
}

// ── exclusive boundary edge cases ─────────────────────────────────────────────

#[test]
fn exclusive_both_ends_value_at_boundary_returns_false() {
    // ISBETWEEN(5, 1, 10, FALSE, FALSE) with value NOT at boundary returns true
    assert_eq!(
        isbetween_fn(&[
            Value::Number(5.0),
            Value::Number(1.0),
            Value::Number(10.0),
            Value::Bool(false),
            Value::Bool(false),
        ]),
        Value::Bool(true)
    );
}

#[test]
fn exclusive_lower_value_equals_lower_returns_false() {
    // ISBETWEEN(1, 1, 10, FALSE) → false (exclusive lower, value equals lower)
    assert_eq!(
        isbetween_fn(&[
            Value::Number(1.0),
            Value::Number(1.0),
            Value::Number(10.0),
            Value::Bool(false),
        ]),
        Value::Bool(false)
    );
}

#[test]
fn exclusive_upper_value_equals_upper_returns_false() {
    // ISBETWEEN(10, 1, 10, TRUE, FALSE) → false (exclusive upper, value equals upper)
    assert_eq!(
        isbetween_fn(&[
            Value::Number(10.0),
            Value::Number(1.0),
            Value::Number(10.0),
            Value::Bool(true),
            Value::Bool(false),
        ]),
        Value::Bool(false)
    );
}