1 files changed, 75 insertions, 0 deletions
diff --git a/node_modules/truncate-utf8-bytes/test.js b/node_modules/truncate-utf8-bytes/test.js
new file mode 100644
index 0000000..bde24f4
--- /dev/null
+++ b/node_modules/truncate-utf8-bytes/test.js
@@ -0,0 +1,75 @@
+"use strict";
+
+var test = require("tape");
+var truncate = require("./");
+var browserTruncate = require("./browser");
+
+function isHighSurrogate(codePoint) {
+  return codePoint >= 0xd800 && codePoint <= 0xdbff;
+}
+
+function repeat(string, times) {
+  return new Array(times + 1).join(string);
+}
+
+function assertLengths(t, string, charLength, byteLength) {
+  t.equal(string.length, charLength);
+  t.equal(Buffer.byteLength(string), byteLength);
+}
+
+// Test writing files to the fs
+//
+
+try {
+  var blns = require("./vendor/big-list-of-naughty-strings/blns.json");
+}
+catch (err) {
+  console.error("Error: Cannot load file './vendor/big-list-of-naughty-strings/blns.json'");
+  console.error();
+  console.error("Make sure you've initialized git submodules by running");
+  console.error();
+  console.error("    git submodule update --init");
+  console.error();
+  process.exit(1);
+}
+
+// Run tests against both implementations
+[truncate, browserTruncate].forEach(function(truncate) {
+  test("strings", function(t) {
+    assertLengths(t, truncate("a☃", 2), 1, 1);
+    assertLengths(t, truncate(repeat("a", 250) + '\uD800\uDC00', 255), 252, 254);
+    assertLengths(t, truncate(repeat("a", 251) + '\uD800\uDC00', 255), 253, 255);
+    assertLengths(t, truncate(repeat("a", 252) + '\uD800\uDC00', 255), 252, 252);
+    assertLengths(t, truncate(repeat("a", 253) + '\uD800\uDC00', 255), 253, 253);
+    assertLengths(t, truncate(repeat("a", 254) + '\uD800\uDC00', 255), 254, 254);
+    assertLengths(t, truncate(repeat("a", 255) + '\uD800\uDC00', 255), 255, 255);
+    t.end();
+  });
+
+  // Truncate various strings
+  [].concat(
+    [
+      repeat("a", 300),
+      repeat("a", 252) + '\uD800\uDC00',
+      repeat("a", 251) + '\uD800\uDC00',
+      repeat("a", 253) + '\uD800\uDC00',
+    ],
+    blns
+  ).forEach(function(str) {
+    test(JSON.stringify(str), function(t) {
+      var i = 0;
+      t.equals(truncate(str, 0), "");
+      // Truncate string one byte at a time
+      while (true) {
+        var truncated = truncate(str, i);
+        t.ok(Buffer.byteLength(truncated) <= i);
+        t.ok( ! isHighSurrogate(truncated[truncated.length - 1]));
+        if (truncated === str) {
+          break;
+        }
+        i += 1;
+      }
+      t.end();
+    });
+  });
+});