Adds unit tests

1 files changed, 23 insertions, 1 deletions

diff --git a/tst/either.test.ts b/tst/either.test.ts
index d87bcab..6f37508 100644
--- a/tst/either.test.ts
+++ b/tst/either.test.ts
@@ -1,4 +1,26 @@
-import { Either } from '@emprespresso/pengueno';
+import { Either } from '../lib/index';
+
+describe('Either.basic', () => {
+    test('mapRight/mapLeft/swap', () => {
+        const r = Either.right<string, number>(2)
+            .mapRight((n) => n + 1)
+            .mapLeft((e) => e.toUpperCase());
+
+        expect(r.right().get()).toBe(3);
+        expect(r.swap().left().get()).toBe(3);
+
+        const l = Either.left<string, number>('nope').mapRight((n) => n + 1);
+        expect(l.left().get()).toBe('nope');
+        expect(l.swap().right().get()).toBe('nope');
+    });
+
+    test('joinRight combines rights', () => {
+        const a = Either.right<string, number>(2);
+        const b = Either.right<string, number>(3);
+        const res = a.joinRight(b, (x, y) => x + y);
+        expect(res.right().get()).toBe(5);
+    });
+});
 
 describe('Either.retrying', () => {
     beforeEach(() => {