test: test that cache is required in ssrMode

packages/graphql-hooks-ssr/index.test.js

@@ -27,4 +27,23 @@ describe('getInitialState', () => {
     expect(result).toEqual({ foo: 'bar' })
     expect(resolvedPromises).toBe(2)
   })
+
+  it("throws if a cache hasn't been provided", async () => {
+    const MockApp = () => 'hello world'
+
+    const mockClient = {
+      ssrPromises: []
+    }
+
+    expect(
+      getInitialState({
+        App: MockApp,
+        client: mockClient
+      })
+    ).rejects.toEqual(
+      new Error(
+        'A cache implementation must be provided for SSR, please pass one to `GraphQLClient` via `options`.'
+      )
+    )
+  })
 })

packages/graphql-hooks/test/unit/GraphQLClient.test.js

@@ -37,6 +37,15 @@ describe('GraphQLClient', () => {
       global.fetch = oldFetch
     })
 
+    it('throws if config.ssrMode is true and no config.cache is provided', () => {
+      expect(() => {
+        new GraphQLClient({
+          ...validConfig,
+          ssrMode: true
+        })
+      }).toThrow('GraphQLClient: config.cache is required when in ssrMode')
+    })
+
     it('assigns config.cache to an instance property', () => {
       const cache = { get: 'get', set: 'set' }
       const client = new GraphQLClient({ ...validConfig, cache })
@@ -49,8 +58,12 @@ describe('GraphQLClient', () => {
       expect(client.headers).toBe(headers)
     })
 
-    it('assigns config.ssrMode to an instance property', () => {
-      const client = new GraphQLClient({ ...validConfig, ssrMode: true })
+    it('assigns config.ssrMode to an instance property if config.cache is provided', () => {
+      const client = new GraphQLClient({
+        ...validConfig,
+        ssrMode: true,
+        cache: { get: 'get', set: 'set' }
+      })
       expect(client.ssrMode).toBe(true)
     })