tmpltool 1.5.0

A fast and simple command-line template rendering tool using MiniJinja templates with environment variables
Documentation 
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use minijinja::value::Kwargs;
use tmpltool::functions::Function;
use tmpltool::functions::random::GetRandom;

// Helper to create kwargs for testing
fn create_kwargs_i64(args: Vec<(&str, i64)>) -> Kwargs {
    Kwargs::from_iter(
        args.into_iter()
            .map(|(k, v)| (k, minijinja::Value::from(v))),
    )
}

#[test]
fn test_get_random_default_range() {
    let kwargs: Kwargs = Kwargs::from_iter(Vec::<(&str, minijinja::Value)>::new());
    let result = GetRandom::call(kwargs).unwrap();
    let value = result.as_i64().unwrap();

    // Default range is 0-100 (exclusive)
    assert!(
        (0..100).contains(&value),
        "Value should be in [0, 100): {}",
        value
    );
}

#[test]
fn test_get_random_custom_range() {
    let kwargs = create_kwargs_i64(vec![("start", 10), ("end", 20)]);
    let result = GetRandom::call(kwargs).unwrap();
    let value = result.as_i64().unwrap();

    assert!(
        (10..20).contains(&value),
        "Value should be in [10, 20): {}",
        value
    );
}

#[test]
fn test_get_random_single_value_range() {
    // Range [5, 6) should only return 5
    let kwargs = create_kwargs_i64(vec![("start", 5), ("end", 6)]);
    let result = GetRandom::call(kwargs).unwrap();
    let value = result.as_i64().unwrap();

    assert_eq!(value, 5, "Single value range should return start value");
}

#[test]
fn test_get_random_negative_range() {
    let kwargs = create_kwargs_i64(vec![("start", -10), ("end", 0)]);
    let result = GetRandom::call(kwargs).unwrap();
    let value = result.as_i64().unwrap();

    assert!(
        (-10..0).contains(&value),
        "Value should be in [-10, 0): {}",
        value
    );
}

#[test]
fn test_get_random_crossing_zero() {
    let kwargs = create_kwargs_i64(vec![("start", -5), ("end", 5)]);
    let result = GetRandom::call(kwargs).unwrap();
    let value = result.as_i64().unwrap();

    assert!(
        (-5..5).contains(&value),
        "Value should be in [-5, 5): {}",
        value
    );
}

#[test]
fn test_get_random_large_range() {
    let kwargs = create_kwargs_i64(vec![("start", 0), ("end", 1000000)]);
    let result = GetRandom::call(kwargs).unwrap();
    let value = result.as_i64().unwrap();

    assert!(
        (0..1000000).contains(&value),
        "Value should be in [0, 1000000): {}",
        value
    );
}

#[test]
fn test_get_random_invalid_range_equal() {
    let kwargs = create_kwargs_i64(vec![("start", 10), ("end", 10)]);
    let result = GetRandom::call(kwargs);

    assert!(result.is_err());
    assert!(
        result
            .err()
            .unwrap()
            .to_string()
            .contains("must be less than end")
    );
}

#[test]
fn test_get_random_invalid_range_reversed() {
    let kwargs = create_kwargs_i64(vec![("start", 20), ("end", 10)]);
    let result = GetRandom::call(kwargs);

    assert!(result.is_err());
    assert!(
        result
            .err()
            .unwrap()
            .to_string()
            .contains("must be less than end")
    );
}

#[test]
fn test_get_random_only_start() {
    let kwargs = create_kwargs_i64(vec![("start", 50)]);
    let result = GetRandom::call(kwargs).unwrap();
    let value = result.as_i64().unwrap();

    // Should use default end of 100
    assert!(
        (50..100).contains(&value),
        "Value should be in [50, 100): {}",
        value
    );
}

#[test]
fn test_get_random_only_end() {
    let kwargs = create_kwargs_i64(vec![("end", 50)]);
    let result = GetRandom::call(kwargs).unwrap();
    let value = result.as_i64().unwrap();

    // Should use default start of 0
    assert!(
        (0..50).contains(&value),
        "Value should be in [0, 50): {}",
        value
    );
}

#[test]
fn test_get_random_distribution() {
    // Test that random values are somewhat distributed (not all the same)
    let kwargs = create_kwargs_i64(vec![("start", 0), ("end", 10)]);
    let mut values = std::collections::HashSet::new();

    for _ in 0..50 {
        let result = GetRandom::call(kwargs.clone()).unwrap();
        values.insert(result.as_i64().unwrap());
    }

    // With 50 random values in [0, 10), we should get at least 5 unique values
    assert!(
        values.len() >= 5,
        "Should have reasonable distribution, got {} unique values out of 50",
        values.len()
    );
}

#[test]
fn test_get_random_always_in_range() {
    // Run many times to ensure it always stays in range
    let kwargs = create_kwargs_i64(vec![("start", 1), ("end", 10)]);

    for _ in 0..100 {
        let result = GetRandom::call(kwargs.clone()).unwrap();
        let value = result.as_i64().unwrap();
        assert!(
            (1..10).contains(&value),
            "Value should always be in [1, 10): {}",
            value
        );
    }
}