feat(tests): Added Usage Unit Tests

test/unit/controllers/rest-api/middleware/error-unit.js

@@ -0,0 +1,66 @@
+/*
+Unit tests for the REST API middleware that handle response errors.
+*/
+
+// Public npm libraries
+import { assert } from 'chai'
+import sinon from 'sinon'
+
+// Local libraries
+import errorMiddleware from '../../../../../src/controllers/rest-api/middleware/error.js'
+import { context as mockContext } from '../../../../unit/mocks/ctx-mock.js'
+
+describe('#Validators', () => {
+  let ctx
+  let sandbox
+
+  beforeEach(() => {
+    // Mock the context object.
+    ctx = mockContext()
+
+    sandbox = sinon.createSandbox()
+  })
+
+  afterEach(() => sandbox.restore())
+
+  describe('#errorMiddleware', () => {
+    it('should run next function', async () => {
+      // Spy on next
+      const next = sinon.spy(() => { })
+      errorMiddleware()(ctx, next)
+
+      assert.isTrue(next.calledOnce)
+    })
+
+    it('should handle unknown status error', async () => {
+      try {
+        const next = async () => {
+          const e = new Error('test error')
+          e.status = null
+          throw e
+        }
+
+        await errorMiddleware()(ctx, next)
+        assert.fail('Unexpected code path')
+      } catch (error) {
+        assert.equal(ctx.status, 500)
+        assert.equal(ctx.body, 'test error')
+      }
+    })
+    it('should handle known status error', async () => {
+      try {
+        const next = async () => {
+          const e = new Error('test error')
+          e.status = 422
+          throw e
+        }
+
+        await errorMiddleware()(ctx, next)
+        assert.fail('Unexpected code path')
+      } catch (error) {
+        assert.equal(ctx.status, 422)
+        assert.equal(ctx.body, 'test error')
+      }
+    })
+  })
+})