1 files changed, 62 insertions, 0 deletions
diff --git a/io/ioutil_test.ts b/io/ioutil_test.ts
new file mode 100644
index 000000000..422901e4a
--- /dev/null
+++ b/io/ioutil_test.ts
@@ -0,0 +1,62 @@
+import { Reader, ReadResult } from "deno";
+import { assertEqual, test } from "../testing/mod.ts";
+import { readInt, readLong, readShort, sliceLongToBytes } from "./ioutil.ts";
+import { BufReader } from "./bufio.ts";
+
+class BinaryReader implements Reader {
+  index = 0;
+
+  constructor(private bytes: Uint8Array = new Uint8Array(0)) {}
+
+  async read(p: Uint8Array): Promise<ReadResult> {
+    p.set(this.bytes.subarray(this.index, p.byteLength));
+    this.index += p.byteLength;
+    return { nread: p.byteLength, eof: false };
+  }
+}
+
+test(async function testReadShort() {
+  const r = new BinaryReader(new Uint8Array([0x12, 0x34]));
+  const short = await readShort(new BufReader(r));
+  assertEqual(short, 0x1234);
+});
+
+test(async function testReadInt() {
+  const r = new BinaryReader(new Uint8Array([0x12, 0x34, 0x56, 0x78]));
+  const int = await readInt(new BufReader(r));
+  assertEqual(int, 0x12345678);
+});
+
+test(async function testReadLong() {
+  const r = new BinaryReader(
+    new Uint8Array([0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78])
+  );
+  const long = await readLong(new BufReader(r));
+  assertEqual(long, 0x1234567812345678);
+});
+
+test(async function testReadLong2() {
+  const r = new BinaryReader(
+    new Uint8Array([0, 0, 0, 0, 0x12, 0x34, 0x56, 0x78])
+  );
+  const long = await readLong(new BufReader(r));
+  assertEqual(long, 0x12345678);
+});
+
+test(async function testSliceLongToBytes() {
+  const arr = sliceLongToBytes(0x1234567890abcdef);
+  const actual = readLong(new BufReader(new BinaryReader(new Uint8Array(arr))));
+  const expected = readLong(
+    new BufReader(
+      new BinaryReader(
+        new Uint8Array([0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef])
+      )
+    )
+  );
+  assertEqual(actual, expected);
+});
+
+test(async function testSliceLongToBytes2() {
+  const arr = sliceLongToBytes(0x12345678);
+  assertEqual(arr, [0, 0, 0, 0, 0x12, 0x34, 0x56, 0x78]);
+});