add keys test

test/background/keys.test.js

@@ -0,0 +1,55 @@
+import { expect } from "chai";
+import { identifyKey, identifyKeys, hasPrefix } from '../../src/background/keys';
+
+describe('keys', () => {
+  describe('#identifyKey', () => {
+    it('return true if key matched', () => {
+      expect(identifyKey(
+        { code: 100 },
+        { code: 100 })).to.be.true;
+      expect(identifyKey(
+        { code: 100, shift: true, ctrl: true },
+        { code: 100, shift: true, ctrl: true })).to.be.true;
+      expect(identifyKey(
+        { code: 100, shift: false, ctrl: false },
+        { code: 100 })).to.be.true;
+    });
+
+    it('return false if key not matched', () => {
+      expect(identifyKey(
+        { code: 100 },
+        { code: 101 })).to.be.false;
+      expect(identifyKey(
+        { code: 100, shift: true, ctrl: true },
+        { code: 100, shift: true })).to.be.false;
+    });
+  });
+
+  describe('#identifyKeys', () => {
+    it ('return true if keys matched', () => {
+      let keys = [{ code: 100 }, { code: 101, ctrl: false}];
+      let prefix = [{ code: 100, ctrl: false }, { code: 101 }];
+      expect(hasPrefix(keys, prefix)).to.be.true;
+    });
+
+    it ('return false if keys matched', () => {
+      let keys = [{ code: 100 }, { code: 101, ctrl: true }];
+      let prefix = [{ code: 100 }, { code: 101 }];
+      expect(hasPrefix(keys, prefix)).to.be.false;
+    });
+  });
+
+  describe('#hasPrefix', () => {
+    it ('return true if prefix matched', () => {
+      let keys = [{ code: 100 }, { code: 101 }, { code: 102 }];
+      let prefix = [{ code: 100 }, { code: 101 }];
+      expect(hasPrefix(keys, prefix)).to.be.true;
+    });
+
+    it ('return false if prefix not matched', () => {
+      let keys = [{ code: 100 }, { code: 101 }, { code: 102 }];
+      let prefix = [{ code: 102 }];
+      expect(hasPrefix(keys, prefix)).to.be.false;
+    });
+  });
+});