revert(api): decouple api from curriculum

This reverts commit c077ffe4b9
via PR #40703

api-server/server/utils/in-memory-cache.test.js

@@ -0,0 +1,68 @@
+/* global describe beforeEach expect it */
+import inMemoryCache from './in-memory-cache';
+import sinon from 'sinon';
+
+describe('InMemoryCache', () => {
+  let reportErrorStub;
+  const theAnswer = 42;
+  const before = 'before';
+  const after = 'after';
+  const emptyCacheValue = null;
+
+  beforeEach(() => {
+    reportErrorStub = sinon.spy();
+  });
+
+  it('throws if no report function is passed as a second argument', () => {
+    expect(() => inMemoryCache(null)).toThrowError(
+      'No reportError function specified for this in-memory-cache'
+    );
+  });
+
+  describe('get', () => {
+    it('returns an initial value', () => {
+      const cache = inMemoryCache(theAnswer, reportErrorStub);
+      expect(cache.get()).toBe(theAnswer);
+    });
+  });
+
+  describe('update', () => {
+    it('updates the cached value', () => {
+      const cache = inMemoryCache(before, reportErrorStub);
+      cache.update(() => after);
+      expect(cache.get()).toBe(after);
+    });
+
+    it('can handle promises correctly', done => {
+      const cache = inMemoryCache(before, reportErrorStub);
+      const promisedUpdate = () => new Promise(resolve => resolve(after));
+      cache.update(promisedUpdate).then(() => {
+        expect(cache.get()).toBe(after);
+        done();
+      });
+    });
+
+    it('reports errors thrown from the update function', () => {
+      const reportErrorStub = sinon.spy();
+      const cache = inMemoryCache(before, reportErrorStub);
+
+      const updateError = new Error('An update error');
+      const updateThatThrows = () => {
+        throw updateError;
+      };
+
+      cache.update(updateThatThrows);
+      expect(reportErrorStub.calledWith(updateError)).toBe(true);
+    });
+  });
+
+  describe('clear', () => {
+    it('clears the  cache', () => {
+      expect.assertions(2);
+      const cache = inMemoryCache(theAnswer, reportErrorStub);
+      expect(cache.get()).toBe(theAnswer);
+      cache.clear();
+      expect(cache.get()).toBe(emptyCacheValue);
+    });
+  });
+});