Super basic oidc tests

src/__mocks__/redux-oidc.js

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+export default {}

src/utils/getUserManagerForOpenIdConnectClient.test.js

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+import getUserManagerForOpenIdConnectClient from './getUserManagerForOpenIdConnectClient.js'
+
+describe('getUserManagerForOpenIdConnectClient', () => {
+  it('returns undefined if store is not provided', () => {
+    const expectedReturnVal = undefined
+    const returnVal = getUserManagerForOpenIdConnectClient(undefined, {})
+
+    expect(returnVal).toEqual(expectedReturnVal)
+  })
+
+  it('returns undefined if oidcSettings are not provided', () => {
+    const expectedReturnVal = undefined
+    const returnVal = getUserManagerForOpenIdConnectClient({}, undefined)
+
+    expect(returnVal).toEqual(expectedReturnVal)
+  })
+})