58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
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var assert = require('assert');
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var slice = require('../lib/slice');
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var data = ['a', 'b', 'c', 'd', 'e', 'f'];
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suite('slice', function() {
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test('no params yields copy', function() {
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assert.deepEqual(slice(data), data);
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});
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test('no end param defaults to end', function() {
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assert.deepEqual(slice(data, 2), data.slice(2));
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});
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test('zero end param yields empty', function() {
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assert.deepEqual(slice(data, 0, 0), []);
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});
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test('first element with explicit params', function() {
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assert.deepEqual(slice(data, 0, 1, 1), ['a']);
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});
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test('last element with explicit params', function() {
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assert.deepEqual(slice(data, -1, 6), ['f']);
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});
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test('empty extents and negative step reverses', function() {
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assert.deepEqual(slice(data, null, null, -1), ['f', 'e', 'd', 'c', 'b', 'a']);
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});
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test('negative step partial slice', function() {
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assert.deepEqual(slice(data, 4, 2, -1), ['e', 'd']);
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});
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test('negative step partial slice no start defaults to end', function() {
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assert.deepEqual(slice(data, null, 2, -1), ['f', 'e', 'd']);
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});
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test('extents clamped end', function() {
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assert.deepEqual(slice(data, null, 100), data);
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});
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test('extents clamped beginning', function() {
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assert.deepEqual(slice(data, -100, 100), data);
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});
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test('backwards extents yields empty', function() {
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assert.deepEqual(slice(data, 2, 1), []);
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});
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test('zero step gets shot down', function() {
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assert.throws(function() { slice(data, null, null, 0) });
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});
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});
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