76 lines
2.2 KiB
JavaScript
76 lines
2.2 KiB
JavaScript
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"use strict";
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var test = require("tape");
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var truncate = require("./");
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var browserTruncate = require("./browser");
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function isHighSurrogate(codePoint) {
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return codePoint >= 0xd800 && codePoint <= 0xdbff;
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}
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function repeat(string, times) {
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return new Array(times + 1).join(string);
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}
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function assertLengths(t, string, charLength, byteLength) {
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t.equal(string.length, charLength);
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t.equal(Buffer.byteLength(string), byteLength);
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}
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// Test writing files to the fs
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//
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try {
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var blns = require("./vendor/big-list-of-naughty-strings/blns.json");
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}
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catch (err) {
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console.error("Error: Cannot load file './vendor/big-list-of-naughty-strings/blns.json'");
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console.error();
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console.error("Make sure you've initialized git submodules by running");
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console.error();
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console.error(" git submodule update --init");
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console.error();
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process.exit(1);
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}
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// Run tests against both implementations
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[truncate, browserTruncate].forEach(function(truncate) {
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test("strings", function(t) {
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assertLengths(t, truncate("a☃", 2), 1, 1);
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assertLengths(t, truncate(repeat("a", 250) + '\uD800\uDC00', 255), 252, 254);
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assertLengths(t, truncate(repeat("a", 251) + '\uD800\uDC00', 255), 253, 255);
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assertLengths(t, truncate(repeat("a", 252) + '\uD800\uDC00', 255), 252, 252);
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assertLengths(t, truncate(repeat("a", 253) + '\uD800\uDC00', 255), 253, 253);
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assertLengths(t, truncate(repeat("a", 254) + '\uD800\uDC00', 255), 254, 254);
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assertLengths(t, truncate(repeat("a", 255) + '\uD800\uDC00', 255), 255, 255);
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t.end();
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});
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// Truncate various strings
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[].concat(
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[
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repeat("a", 300),
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repeat("a", 252) + '\uD800\uDC00',
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repeat("a", 251) + '\uD800\uDC00',
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repeat("a", 253) + '\uD800\uDC00',
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],
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blns
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).forEach(function(str) {
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test(JSON.stringify(str), function(t) {
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var i = 0;
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t.equals(truncate(str, 0), "");
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// Truncate string one byte at a time
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while (true) {
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var truncated = truncate(str, i);
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t.ok(Buffer.byteLength(truncated) <= i);
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t.ok( ! isHighSurrogate(truncated[truncated.length - 1]));
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if (truncated === str) {
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break;
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}
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i += 1;
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}
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t.end();
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});
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});
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});
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