tests: Verify function default values.

optimal/CHANGELOG.md

@@ -18,6 +18,7 @@ changelog will use the new verbiage, but may affect previous APIs.
 - Updated `optimal()` to no longer accept the object to validate and build as the 1st argument. Instead a `validate()` function is returned, in which that object should be passed to. Because of this change, TypeScript types are more powerful and accurate.
 - Updated `array()` to no longer accept a schema as an argument, use `array().of()` instead.
 - Updated `func()` to not be nullable by default. Instead uses `undefined`.
+- Updated `func()` default values to now be factoried (function returns a function).
 - Updated `instance()` to no longer accept a schema as an argument, use `instance().of()` instead.
 - Updated `object()` to no longer accept a schema as an argument, use `object().of()` instead.
 - Updated `union()` to no longer accept a list of schemas as an argument, use `union().of()` instead.

optimal/tests/schemas/func.test.ts

@@ -18,6 +18,13 @@ describe('func()', () => {
 
 	runCommonTests(() => func(), noop, { defaultValue: undefined });
 
+	it('supports default values', () => {
+		const spy = jest.fn();
+		schema = func<AnyFunction>(() => spy);
+
+		expect(schema.validate(undefined)).toBe(spy);
+	});
+
 	describe('type()', () => {
 		it('returns "function"', () => {
 			expect(func().type()).toBe('function');