reorg: move js runtime tests to cli/js/tests/ (#4250)

All Deno runtime test files were moved to cli/js/tests/ directory.

It makes a clear distinction that cli/js/tests/ contains code
that is run under Deno runtime as opposed to code in cli/js/ which
is used to create bundle and snapshot with "deno_typescript".

cli/js/tests/blob_test.ts

@@ -0,0 +1,62 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { unitTest, assert, assertEquals } from "./test_util.ts";
+
+unitTest(function blobString(): void {
+  const b1 = new Blob(["Hello World"]);
+  const str = "Test";
+  const b2 = new Blob([b1, str]);
+  assertEquals(b2.size, b1.size + str.length);
+});
+
+unitTest(function blobBuffer(): void {
+  const buffer = new ArrayBuffer(12);
+  const u8 = new Uint8Array(buffer);
+  const f1 = new Float32Array(buffer);
+  const b1 = new Blob([buffer, u8]);
+  assertEquals(b1.size, 2 * u8.length);
+  const b2 = new Blob([b1, f1]);
+  assertEquals(b2.size, 3 * u8.length);
+});
+
+unitTest(function blobSlice(): void {
+  const blob = new Blob(["Deno", "Foo"]);
+  const b1 = blob.slice(0, 3, "Text/HTML");
+  assert(b1 instanceof Blob);
+  assertEquals(b1.size, 3);
+  assertEquals(b1.type, "text/html");
+  const b2 = blob.slice(-1, 3);
+  assertEquals(b2.size, 0);
+  const b3 = blob.slice(100, 3);
+  assertEquals(b3.size, 0);
+  const b4 = blob.slice(0, 10);
+  assertEquals(b4.size, blob.size);
+});
+
+unitTest(function blobShouldNotThrowError(): void {
+  let hasThrown = false;
+
+  try {
+    const options1: object = {
+      ending: "utf8",
+      hasOwnProperty: "hasOwnProperty"
+    };
+    const options2: object = Object.create(null);
+    new Blob(["Hello World"], options1);
+    new Blob(["Hello World"], options2);
+  } catch {
+    hasThrown = true;
+  }
+
+  assertEquals(hasThrown, false);
+});
+
+unitTest(function nativeEndLine(): void {
+  const options: object = {
+    ending: "native"
+  };
+  const blob = new Blob(["Hello\nWorld"], options);
+
+  assertEquals(blob.size, Deno.build.os === "win" ? 12 : 11);
+});
+
+// TODO(qti3e) Test the stored data in a Blob after implementing FileReader API.