You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/tract/harness/core-proptest-pulse/src
    
    the code of the file until where you have to start completion: #![cfg(test)]

#[macro_use]
extern crate log;

use proptest::prelude::*;
use proptest::proptest;
use proptest::test_runner::TestCaseResult;
use 
    
    fn proptest_pad(pulse in 1i32..3, input_len in 0i32..10, begin in 0i32..3, end in 0i32..3) {
        let mut model = TypedModel::default();
        let s = model.symbol_table.sym("S");
        let a = model.add_source("a", f32::fact(&[s])).unwrap();
        let pad = model.wire_node("pad", Pad::new(vec![(begin as _, end as _)],
        PadMode::Constant(Arc::new(Tensor::from(-1f32)))), &[a]).unwrap();
        model.set_output_outlets(&pad).unwrap();

        let input = Array1::range(1.0f32, input_len as f32 + 1.0, 1.0);
        proptest_regular_against_pulse(model, pulse as _, input.into_dyn(), 0)?;
    }