diff --git a/js/tests/jabs_test.js b/js/tests/jabs_test.js
new file mode 100644
index 000000000..c5c055a36
--- /dev/null
+++ b/js/tests/jabs_test.js
@@ -0,0 +1,18 @@
+Math.abs = undefined
+// /*/ // ⚡
+export const tests = []
+const t = (f) => tests.push(f)
+
+t(() => isPositive(3))
+t(() => isPositive(1998790))
+t(() => !isPositive(-1))
+t(() => !isPositive(-0.7))
+t(() => !isPositive(-787823))
+t(() => !isPositive(0))
+
+t(({ eq }) => eq(abs(0), 0))
+t(({ eq }) => eq(abs(-1), 1))
+t(({ eq }) => eq(abs(-13.2), 13.2))
+t(({ eq }) => eq(abs(132), 132))
+
+Object.freeze(tests)