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Notes

Goals

  • Show pitfalls and common mistakes
    • And how to avoid them
  • Cool tools & techniques
  • (Optional) Testing philosophy, e.g. mocking

Anti-goals:

  • Specifics for testing a given project

General flow

Start with a simple TODOs app.

@SpringBootTest out of the box

For API testing:

  • MockMvc
    • .get(...)
    • .post(...).param(..., ...)

For web-based testing:

  • WebClient from org.htmlunit:htmlunit:
    • .click()
    • It also supports Javascript ... but not all of Javascript.
    • Use Selenium in that case.

@SpringBootTest with Tomcat

  • Show logging valve
  • How it shows in the test
  • How to debug a running test ("breakpoint > suspend > thread")

Test context caching

  • Add a bunch of tests modeled after WebMvc tests
  • Add a slow bean
  • Show that the cache works
  • Change the tests and make them slightly different (profile, properties, MockBean)
    • terribly slow with the cache misses

Take a break with tools

  • AssertJ
  • AssertJ with mockMvc
  • Custom assertions

Slices!

  • WebMvc slice
  • Manual configurationss
  • DataJPA Slice
    • See the "search" filter
    • not the right database (h2 vs postgres)

Testcontainers

  • Use a real DB
    • Replace H2 with Postgres
    • Add docker-compose
    • Now todos persist, yay
  • Use testcontainers
    • @ServiceConnection
    • Discuss Singleton bean
  • And now our slice test works!

Taking another break with testing tools

  • Awaitility
  • Mockito
  • Instancio? Datafaker?

Testing custom properties

Want to show

  • Tools

    • assertJ
      • custom assertions
    • Awaitility
    • (?) JSON testing

  • Testing builtins

    • @TestConfiguration
    • Mention MockBean/SpyBean
    • Output capture

  • Web testing

    • MockMvc
    • WebClient (HtmlUnit)
    • MockMvc with assertJ

  • Slice tests

    • @SpringBootTest with classes
    • WebMvcTests
    • JpaTests
    • CustomSliceTests

  • SpringApplicationBuilder

  • Spring bean validation testing

  • Instancio (is this a "cool tool" ?)

  • Security testing

  • JUnit extensions

  • Wiremock

  • A word on Mockito

    • Mock
    • Spy
    • Partial mock
    • Argument captor
    • Void methods
    • Answer
    • Statics
    • Constructor
    • Deep stubs

Explore this

  • Reactive tests
  • Custom slice test: custom mockmvc
  • Spring Batch tests
  • MockRestServiceServer
  • Parallel testing
  • Testcontainers lifecycle with JUnit 5.1