LibJS: Rename some tests

"feature-basic" is a bit more logical than having a ton of
"basic-feature" (when it comes to the visual overview of it all.)

Libraries/LibJS/Tests/array-basic.js

@@ -0,0 +1,23 @@
+function assert(x) { if (!x) throw 1; }
+
+try {
+    var a = [1, 2, 3];
+
+    assert(typeof a === "object");
+    assert(a.length === 3);
+    assert(a[0] === 1);
+    assert(a[1] === 2);
+    assert(a[2] === 3);
+
+    a[1] = 5;
+    assert(a[1] === 5);
+    assert(a.length === 3);
+
+    a.push(7);
+    assert(a[3] === 7);
+    assert(a.length === 4);
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}