Some alfa compatibility tests

packages/alfa-compatibility/test/every.spec.ts

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+import { test } from "@siteimprove/alfa-test";
+import { BrowserSpecific } from "../src/browser-specific";
+import { every } from "../src/every";
+
+test("Can run every on a set of browser branches", t => {
+  const n = BrowserSpecific.of(1, ["chrome"])
+    .branch(2, ["firefox"])
+    .branch(4, ["safari"]);
+
+  t(!every(n, t => t === 4));
+  t(every(n, t => t < 8));
+});

packages/alfa-compatibility/test/guards.spec.ts

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+import { test } from "@siteimprove/alfa-test";
+import { BrowserSpecific } from "../src/browser-specific";
+import { isBrowserName, isBrowserSpecific } from "../src/guards";
+
+test("isBrowserName returns true on valid browser names", t => {
+  t(isBrowserName("chrome"));
+  t(!isBrowserName("foo"));
+});
+
+test("isBrowserName returns true on valid browser names", t => {
+  const n = BrowserSpecific.of(1, ["chrome"])
+    .branch(2, ["firefox"])
+    .branch(4, ["safari"]);
+
+  t(isBrowserSpecific(n));
+  t(!isBrowserSpecific("foo"));
+});

packages/alfa-compatibility/test/map.spec.ts

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+import { test } from "@siteimprove/alfa-test";
+import { BrowserSpecific } from "../src/browser-specific";
+import { map } from "../src/map";
+
+test("Can map a set of browser branches", t => {
+  const n = BrowserSpecific.of(1, ["chrome"])
+    .branch(2, ["firefox"])
+    .branch(4, ["safari"]);
+  const f: (n: number) => number = n => n * 2;
+  t.deepEqual(
+    map(n, f),
+    BrowserSpecific.of(2, ["chrome"])
+      .branch(4, ["firefox"])
+      .branch(8, ["safari"])
+  );
+});

packages/alfa-compatibility/test/reduce.spec.ts

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+import { test } from "@siteimprove/alfa-test";
+import { BrowserSpecific } from "../src/browser-specific";
+import { reduce } from "../src/reduce";
+
+test("Can run every on a set of browser branches with initial value", t => {
+  const n = BrowserSpecific.of(10, ["chrome"])
+    .branch(11, ["firefox"])
+    .branch(10, ["safari"]);
+
+  const o = BrowserSpecific.of(10, ["chrome"])
+    .branch(11, ["firefox"])
+    .branch(12, ["safari"])
+    .branch(9, ["ie"]);
+
+  const expected = BrowserSpecific.of(3, ["chrome"])
+    .branch(3, ["firefox"])
+    .branch(3, ["safari"]);
+
+  t.deepEqual(reduce([n, o], (acc, val) => acc + 1, 1), expected);
+});
+
+test("Can run every on a set of browser branches without initial value", t => {
+  const n = BrowserSpecific.of(10, ["chrome"])
+    .branch(11, ["firefox"])
+    .branch(10, ["safari"]);
+
+  const o = BrowserSpecific.of(10, ["chrome"])
+    .branch(11, ["firefox"])
+    .branch(12, ["safari"])
+    .branch(9, ["ie"]);
+
+  const expected = BrowserSpecific.of(11, ["chrome"])
+    .branch(12, ["firefox"])
+    .branch(11, ["safari"]);
+
+  t.deepEqual(reduce([n, o], (acc, val) => acc + 1), expected);
+});

packages/alfa-compatibility/test/some.spec.ts

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+import { test } from "@siteimprove/alfa-test";
+import { BrowserSpecific } from "../src/browser-specific";
+import { some } from "../src/some";
+
+test("Can run some on a set of browser branches", t => {
+  const n = BrowserSpecific.of(1, ["chrome"])
+    .branch(2, ["firefox"])
+    .branch(4, ["safari"]);
+
+  t(some(n, t => t === 4));
+  t(!some(n, t => t === 8));
+});