feat(js-checkpoint):add test for more exercise

js/tests/more_test.js

@@ -0,0 +1,19 @@
+export const tests = []
+const t = (f) => tests.push(f)
+
+// more is declared and is a function and take 1 argument
+t(() => typeof more === 'function')
+t(() => more.length === 1)
+
+// more works with positive numbers
+t(() => more(5) === 6)
+t(() => more(more(more(5))) === 8) 
+
+// more works with negative numbers
+t(() => more(-5) === -4)
+t(() => more(more(more(-5))) === -2)
+
+const rand = Math.random()
+t(() => more(rand) === rand + 1)
+
+Object.freeze(tests)