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exercism fetch perl6 flatten-array

flatten-array.t

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#!/usr/bin/env perl6
use v6;
use Test;
use lib my $dir = $?FILE.IO.dirname;
use JSON::Fast;

my Str:D $exercise := 'FlattenArray';
my Version:D $version = v1;
my Str $module //= $exercise;
plan 8;

use-ok $module or bail-out;
require ::($module);

if ::($exercise).^ver !~~ $version {
  warn "\nExercise version mismatch. Further tests may fail!"
    ~ "\n$exercise is $(::($exercise).^ver.gist). "
    ~ "Test is $($version.gist).\n";
  bail-out 'Example version must match test version.' if %*ENV<EXERCISM>;
}

require ::($module) <&flatten-array>;

my $c-data = from-json $=pod.pop.contents;
is-deeply flatten-array(.<input>), |.<expected description> for @($c-data<cases>);

=head2 Canonical Data
=begin code

{
  "exercise": "flatten-array",
  "version": "1.1.0",
  "cases": [
    {
      "description": "no nesting",
      "property": "flatten",
      "input": [0, 1, 2],
      "expected": [0, 1, 2]
    },
    {
      "description": "flattens array with just integers present",
      "property": "flatten",
      "input": [1, [2, 3, 4, 5, 6, 7], 8],
      "expected": [1, 2, 3, 4, 5, 6, 7, 8]
    },
    {
      "description": "5 level nesting",
      "property": "flatten",
      "input": [0, 2, [[2, 3], 8, 100, 4, [[[50]]]], -2],
      "expected": [0, 2, 2, 3, 8, 100, 4, 50, -2]
    },
    {
      "description": "6 level nesting",
      "property": "flatten",
      "input": [1, [2, [[3]], [4, [[5]]], 6, 7], 8],
      "expected": [1, 2, 3, 4, 5, 6, 7, 8]
    },
    {
      "description": "6 level nest list with null values",
      "property": "flatten",
      "input": [0, 2, [[2, 3], 8, [[100]], null, [[null]]], -2],
      "expected": [0, 2, 2, 3, 8, 100, -2]
    },
    {
      "description": "all values in nested list are null",
      "property": "flatten",
      "input": [null, [[[null]]], null, null, [[null, null], null], null],
      "expected": []
    }
  ]
}

=end code

unless %*ENV<EXERCISM> {
  skip-rest 'exercism tests';
  exit;
}

subtest 'canonical-data' => {
  (my $c-data-file = "$dir/../../problem-specifications/exercises/{
    $dir.IO.resolve.basename
  }/canonical-data.json".IO.resolve) ~~ :f ??
    is-deeply $c-data, EVAL('from-json $c-data-file.slurp'), 'match problem-specifications' !!
    flunk 'problem-specifications file not found';
}

INIT { $module = 'Example' if %*ENV<EXERCISM> }