test: add UnionToIntersection

andnp · Apr 15, 2019 · a756c7b · a756c7b
1 parent a9a4b4d
commit a756c7b
Showing 1 changed file with 25 additions and 0 deletions.
diff --git a/test/utils/UnionToIntersection.test.ts b/test/utils/UnionToIntersection.test.ts
@@ -0,0 +1,25 @@
+import test from 'ava';
+import { assert } from '../helpers/assert';
+
+import { UnionToIntersection} from '../../src';
+
+test('Union of Strings', t => {
+    type got = UnionToIntersection<'hi' | 'there'>;
+    type expected = 'hi' & 'there';
+
+    assert<got, expected>(t);
+});
+
+test('Union of Objects', t => {
+    type got = UnionToIntersection<   { a: 0 } |
+    { b: 1 } |
+    { c: 2 }>;
+
+    type expected =   {
+        a: 0
+        b: 1
+        c: 2
+      };
+
+    assert<got, expected>(t);
+});