Update tests for callbacks (python/node).

Author: viferga

source/ports/node_port/test/index.js

@@ -142,8 +142,8 @@ describe('metacall', () => {
 
 			// Factorial composition (@trgwii)
 			/*
-			const fact = f.function_factorial(c => v => v);
-			assert.strictEqual(fact(0), 0);
+			const fact = f.function_factorial(c => v => v <= 0 ? 1 : v);
+			assert.strictEqual(fact(0), 1);
 			assert.strictEqual(fact(1), 1);
 			assert.strictEqual(fact(2), 2);
 			assert.strictEqual(fact(3), 6);

source/scripts/python/function/source/function.py

@@ -35,7 +35,7 @@ def function_chain(x):
 	return lambda n: x(x)(n);
 
 def function_factorial(x):
-	return lambda n: 1 if n == 0 else n * x(x)(n - 1);
+	return lambda n: 1 if n <= 0 else n * x(x)(n - 1);
 
 class MyClass:
 	def f(self):