LibJS: Reorganize tests into subfolders

Author: https://github.com/mattco98
Commit: https://github.com/SerenityOS/serenity/commit/4c48c9d69d3
Pull-request: https://github.com/SerenityOS/serenity/pull/2681
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/operators/modulo-basic.js

@@ -0,0 +1,22 @@
+load("test-common.js");
+
+try {
+    assert(10 % 3 === 1);
+    assert(10.5 % 2.5 === 0.5);
+    assert(-0.99 % 0.99 === -0);
+
+    // Examples from MDN:
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+    assert(12 % 5 === 2);
+    assert(-1 % 2 === -1);
+    assert(1 % -2 === 1);
+    assert(isNaN(NaN % 2));
+    assert(1 % 2 === 1);
+    assert(2 % 3 === 2);
+    assert(-4 % 2 === -0);
+    assert(5.5 % 2 === 1.5);
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}