Added tests for version-rewrites

- Now that the code is split out it's super easy to unit test.
- I was being lazy before :)

test/unit/server/services/api-version-compatibility/mw-version-rewrites.test.js

@@ -0,0 +1,108 @@
+const sinon = require('sinon');
+const assert = require('assert');
+
+const mwVersionRewrites = require('../../../../../core/server/services/api-version-compatibility/mw-version-rewrites');
+const configUtils = require('../../../../utils/configUtils');
+
+describe('MW Version Rewrites', function () {
+    let req, res;
+
+    beforeEach(function () {
+        configUtils.set({
+            url: 'https://mysite.com',
+            admin: {
+                url: 'https://admin.mysite.com'
+            }
+        });
+
+        req = {
+            headers: {}
+        };
+
+        res = {
+            header: sinon.stub()
+        };
+    });
+
+    afterEach(function () {
+        sinon.restore();
+    });
+
+    function assertVersionRewrittenWithHeaders(version, path, done) {
+        mwVersionRewrites(req, res, (err) => {
+            assert.deepEqual(req.headers, {'accept-version': `${version}.0`}, 'accept version header was set on req');
+            sinon.assert.calledTwice(res.header);
+            sinon.assert.calledWithExactly(res.header.firstCall, 'Deprecation', `version="${version}"`);
+            sinon.assert.calledWithExactly(res.header.secondCall, 'Link', `<https://admin.mysite.com/ghost/api${path}>; rel="latest-version"`);
+            done(err);
+        });
+    }
+
+    it('does nothing for standard admin urls', function (done) {
+        req.url = '/admin/';
+
+        mwVersionRewrites(req, res, (err) => {
+            assert.deepEqual(req.headers, {}, 'accept version header was NOT set on req');
+            sinon.assert.notCalled(res.header);
+            done(err);
+        });
+    });
+
+    it('does nothing for standard content urls', function (done) {
+        req.url = '/content/';
+
+        mwVersionRewrites(req, res, (err) => {
+            assert.deepEqual(req.headers, {}, 'accept version header was NOT set on req');
+            sinon.assert.notCalled(res.header);
+            done(err);
+        });
+    });
+
+    it('rewrites a legacy v2 admin url', function (done) {
+        req.url = '/v2/admin/session/';
+
+        assertVersionRewrittenWithHeaders('v2', '/admin/session/', done);
+    });
+
+    it('rewrites a legacy v2 content url', function (done) {
+        req.url = '/v2/content/posts/?key=xxx';
+
+        assertVersionRewrittenWithHeaders('v2', '/content/posts/?key=xxx', done);
+    });
+
+    it('rewrites a legacy v3 admin url', function (done) {
+        req.url = '/v3/admin/session/';
+
+        assertVersionRewrittenWithHeaders('v3', '/admin/session/', done);
+    });
+
+    it('rewrites a legacy v3 content url', function (done) {
+        req.url = '/v3/content/posts/?key=xxx';
+
+        assertVersionRewrittenWithHeaders('v3', '/content/posts/?key=xxx', done);
+    });
+
+    it('rewrites a legacy v4 admin url', function (done) {
+        req.url = '/v4/admin/session/';
+
+        assertVersionRewrittenWithHeaders('v4', '/admin/session/', done);
+    });
+
+    it('rewrites a legacy v4 content url', function (done) {
+        req.url = '/v4/content/posts/?key=xxx';
+
+        assertVersionRewrittenWithHeaders('v4', '/content/posts/?key=xxx', done);
+    });
+
+    it('rewrites a legacy canary admin url as if it were v4', function (done) {
+        req.url = '/canary/admin/session/';
+
+        assertVersionRewrittenWithHeaders('v4', '/admin/session/', done);
+    });
+
+    it('rewrites a legacy canary content url as if it were v4', function (done) {
+        req.url = '/canary/content/posts/?key=xxx';
+
+        assertVersionRewrittenWithHeaders('v4', '/content/posts/?key=xxx', done);
+    });
+});