🔬 test: Increase coverage for _zip2.

Also fix dostring example.

package.json

@@ -74,6 +74,7 @@
     "@commitlint/cli": "12.1.1",
     "@functional-abstraction/operator": "^1.0.4",
     "@iterable-iterator/chain": "^1.0.0",
+    "@iterable-iterator/range": "^1.0.0",
     "@iterable-iterator/reduce": "^0.0.1",
     "@iterable-iterator/slice": "^0.0.1",
     "@js-library/commitlint-config": "0.0.4",

src/_zip2.js

@@ -7,7 +7,7 @@ import {iter} from '@iterable-iterator/iter';
  *
  * @example
  * // returns [ [ 'a' , 1 ] , [ 'b' , 2 ] , [ 'c' , 3 ] ]
- * list( _zip2( 'abcd' , range(3) ) ) ;
+ * list( _zip2( 'abcd' , range(1, 4) ) ) ;
  *
  * @param {Iterable} A - The first iterable.
  * @param {Iterable} B - The second iterable.

test/src/zip2.js

@@ -0,0 +1,52 @@
+import test from 'ava';
+
+import {list} from '@iterable-iterator/list';
+import {range} from '@iterable-iterator/range';
+
+import {_zip2} from '../../src/index.js';
+
+import {repr} from './_fixtures.js';
+
+const macro = (t, first, second, out) => {
+	t.deepEqual(list(_zip2(first, second)), out);
+};
+
+macro.title = (title, first, second, out) =>
+	title ?? `_zip2(${repr(first)}, ${repr(second)}) is ${repr(out)}`;
+
+test(
+	macro,
+	[1, 2, 3],
+	[4, 5, 6],
+	[
+		[1, 4],
+		[2, 5],
+		[3, 6],
+	],
+);
+test(
+	macro,
+	[4, 5, 6],
+	[7, 8, 9, 10],
+	[
+		[4, 7],
+		[5, 8],
+		[6, 9],
+	],
+);
+test(
+	macro,
+	[1, 2, 3, 4],
+	[4, 5, 6],
+	[
+		[1, 4],
+		[2, 5],
+		[3, 6],
+	],
+);
+
+test(macro, 'abcd', range(1, 4), [
+	['a', 1],
+	['b', 2],
+	['c', 3],
+]);

yarn.lock

@@ -1298,6 +1298,11 @@
   dependencies:
     "@failure-abstraction/error" "^5.0.5"
 
+"@iterable-iterator/range@^1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@iterable-iterator/range/-/range-1.0.0.tgz#5b3255710e3e0d174a82e38024dc2af3c1aeee25"
+  integrity sha512-rFgziHtzWs/Zl1c5SfkAbUZzXvqvyeMtjsrwdkvXFQ1FCCXmzFjaMOKpr++wFuoV83XzZuiJ6lyHNEd3CSIyTg==
+
 "@iterable-iterator/reduce@^0.0.1":
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/@iterable-iterator/reduce/-/reduce-0.0.1.tgz#35cf9b9c27afcdc1ebcd1a8d1f58162e8abd6290"