BlogRepositoryUTest.kt

@Test fun testBlogsReturnsError() {
  val testObserver = TestObserver<List<Blog>>()
  
  val path = "/blogs"
  
  // Mock a response with status 200 and sample JSON output
  val mockReponse = MockReponse()
                      .setResponseCode(500) // Simulate a 500 HTTP Code
                  
  // Enqueue request
  mockServer.enqueue(mockResponse)
  
  // Call the API
  blogRepository.blogs().subscribe(testObserver)
  testObserver.awaitTerminalEvent(2, TimeUnit.SECONDS)
  
  // No values
  testObserver.assertNoValues()
  // One error recorded
  assertEquals(1, testObserver.errorCount())
  
  // Get the request that was just made
  val request = mockServer.takeRequest()
  // Make sure we made the request to the required path
  assertEquals(path, request.path)
  
}