LibJS: Reorganize tests into subfolders

Author: https://github.com/mattco98
Commit: 4c48c9d69d
Pull-request: https://github.com/SerenityOS/serenity/pull/2681
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/builtins/Math/Math.expm1.js

@@ -0,0 +1,19 @@
+load("test-common.js");
+
+try {
+    assert(Math.expm1.length === 1);
+
+    assert(Math.expm1(0) === 0);
+    assert(isClose(Math.expm1(-2), -0.864664));
+    assert(isClose(Math.expm1(-1), -0.632120));
+    assert(isClose(Math.expm1(1), 1.718281));
+    assert(isClose(Math.expm1(2), 6.389056));
+
+    assert(isNaN(Math.expm1()));
+    assert(isNaN(Math.expm1(undefined)));
+    assert(isNaN(Math.expm1("foo")));
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}