LibJS: Convert remaining top-level tests to new system

Libraries/LibJS/Tests/update-expressions-basic.js

@@ -1,57 +1,53 @@
-load("test-common.js");
+describe("correct behavior", () => {
+  test("basic functionality", () => {
+    let n = 0;
+    expect(++n).toBe(1);
+    expect(n).toBe(1);
 
-try {
-  assertThrowsError(
-    () => {
+    n = 0;
+    expect(n++).toBe(0);
+    expect(n).toBe(1);
+
+    n = 0;
+    expect(--n).toBe(-1);
+    expect(n).toBe(-1);
+
+    n = 0;
+    expect(n--).toBe(0);
+    expect(n).toBe(-1);
+
+    let a = [];
+    expect(a++).toBe(0);
+    expect(a).toBe(1);
+
+    let b = true;
+    expect(b--).toBe(1);
+    expect(b).toBe(0);
+  });
+
+  test("updates that produce NaN", () => {
+    let s = "foo";
+    expect(++s).toBeNaN();
+    expect(s).toBeNaN();
+
+    s = "foo";
+    expect(s++).toBeNaN();
+    expect(s).toBeNaN();
+
+    s = "foo";
+    expect(--s).toBeNaN();
+    expect(s).toBeNaN();
+
+    s = "foo";
+    expect(s--).toBeNaN();
+    expect(s).toBeNaN();
+  });
+});
+
+describe("errors", () => {
+  test("update expression throws reference error", () => {
+    expect(() => {
       ++x;
-    },
-    {
-      error: ReferenceError,
-      message: "'x' is not defined",
-    }
-  );
-
-  var n = 0;
-  assert(++n === 1);
-  assert(n === 1);
-
-  var n = 0;
-  assert(n++ === 0);
-  assert(n === 1);
-
-  var n = 0;
-  assert(--n === -1);
-  assert(n === -1);
-
-  var n = 0;
-  assert(n-- === 0);
-  assert(n === -1);
-
-  var a = [];
-  assert(a++ === 0);
-  assert(a === 1);
-
-  var b = true;
-  assert(b-- === 1);
-  assert(b === 0);
-
-  var s = "foo";
-  assert(isNaN(++s));
-  assert(isNaN(s));
-
-  var s = "foo";
-  assert(isNaN(s++));
-  assert(isNaN(s));
-
-  var s = "foo";
-  assert(isNaN(--s));
-  assert(isNaN(s));
-
-  var s = "foo";
-  assert(isNaN(s--));
-  assert(isNaN(s));
-
-  console.log("PASS");
-} catch (e) {
-  console.log("FAIL: " + e);
-}
+    }).toThrowWithMessage(ReferenceError, "'x' is not defined");
+  });
+});