Merge branch 'std_modified' into merge_std3

1 files changed, 39 insertions, 0 deletions

diff --git a/std/io/readers_test.ts b/std/io/readers_test.ts
new file mode 100644
index 000000000..474407427
--- /dev/null
+++ b/std/io/readers_test.ts
@@ -0,0 +1,39 @@
+const { copy } = Deno;
+import { test } from "../testing/mod.ts";
+import { assertEquals } from "../testing/asserts.ts";
+import { MultiReader, StringReader } from "./readers.ts";
+import { StringWriter } from "./writers.ts";
+import { copyN } from "./ioutil.ts";
+import { decode } from "../strings/mod.ts";
+
+test(async function ioStringReader(): Promise<void> {
+  const r = new StringReader("abcdef");
+  const res0 = await r.read(new Uint8Array(6));
+  assertEquals(res0, 6);
+  const res1 = await r.read(new Uint8Array(6));
+  assertEquals(res1, Deno.EOF);
+});
+
+test(async function ioStringReader(): Promise<void> {
+  const r = new StringReader("abcdef");
+  const buf = new Uint8Array(3);
+  const res1 = await r.read(buf);
+  assertEquals(res1, 3);
+  assertEquals(decode(buf), "abc");
+  const res2 = await r.read(buf);
+  assertEquals(res2, 3);
+  assertEquals(decode(buf), "def");
+  const res3 = await r.read(buf);
+  assertEquals(res3, Deno.EOF);
+  assertEquals(decode(buf), "def");
+});
+
+test(async function ioMultiReader(): Promise<void> {
+  const r = new MultiReader(new StringReader("abc"), new StringReader("def"));
+  const w = new StringWriter();
+  const n = await copyN(w, r, 4);
+  assertEquals(n, 4);
+  assertEquals(w.toString(), "abcd");
+  await copy(w, r);
+  assertEquals(w.toString(), "abcdef");
+});