Add tests and CI.

index.test.js

@@ -0,0 +1,44 @@
+const {
+  getRepositoryOwner, getRepositoryName, getRefName, getShaShort,
+} = require('./index');
+
+test('gets repository owner', () => {
+  expect(getRepositoryOwner('FranzDiebold/github-env-vars-action'))
+      .toEqual('FranzDiebold');
+});
+
+test('gets repository owner for empty GITHUB_REPOSITORY', () => {
+  expect(getRepositoryOwner(undefined)).toBeFalsy();
+});
+
+test('gets repository name', () => {
+  expect(getRepositoryName('FranzDiebold/github-env-vars-action'))
+      .toEqual('github-env-vars-action');
+});
+
+test('gets repository name for empty GITHUB_REPOSITORY', () => {
+  expect(getRepositoryName(undefined)).toBeFalsy();
+});
+
+test('gets ref from simple ref name', () => {
+  expect(getRefName('refs/heads/feature-branch-1'))
+      .toEqual('feature-branch-1');
+});
+
+test('gets ref from complex ref name', () => {
+  expect(getRefName('refs/heads/feat/feature-branch-1'))
+      .toEqual('feat/feature-branch-1');
+});
+
+test('gets repository name for empty GITHUB_REF_NAME', () => {
+  expect(getRefName(undefined)).toBeFalsy();
+});
+
+test('gets short SHA', () => {
+  expect(getShaShort('ffac537e6cbbf934b08745a378932722df287a53'))
+      .toEqual('ffac537e');
+});
+
+test('gets short SHA for empty GITHUB_SHA', () => {
+  expect(getShaShort(undefined)).toBeFalsy();
+});