Add test coverage for more generator methods

Author: tmcw

test/generators/generators-test.js

@@ -0,0 +1,37 @@
+import { test } from "tap";
+import filter from "../../src/generators/filter";
+import map from "../../src/generators/map";
+import range from "../../src/generators/range";
+import valueAt from "../../src/generators/valueAt";
+
+test("filter(value, fn) filters", t => {
+  function* input() {
+    yield* [1, 2, 3, 4];
+  }
+  t.deepEqual(Array.from(filter(input(), i => i % 2 === 0)), [2, 4]);
+  t.end();
+});
+
+test("map(value, fn) maps", t => {
+  function* input() {
+    yield* [1, 2, 3, 4];
+  }
+  t.deepEqual(Array.from(map(input(), i => i * 2)), [2, 4, 6, 8]);
+  t.end();
+});
+
+test("range(start, stop) generates a range", t => {
+  t.deepEqual(Array.from(range(1, 4)), [1, 2, 3]);
+  t.deepEqual(Array.from(range(1, 5, 2)), [1, 3]);
+  t.deepEqual(Array.from(range(3)), [0, 1, 2]);
+  t.end();
+});
+
+test("valueAt(generator, i) picks a value", t => {
+  function* input() {
+    yield* [1, 2, 3, 4];
+  }
+  t.equal(valueAt(input(), 2), 3);
+  t.equal(valueAt(input()), undefined);
+  t.end();
+});

test/index-test.js

@@ -1,5 +1,5 @@
 import { test } from "tap";
-import {Library, FileAttachments} from "../src";
+import { Library, FileAttachments } from "../src";
 
 test("new Library returns a library with the expected keys", async t => {
   t.deepEqual(Object.keys(new Library()).sort(), [