hello, any idea how to verify JSON response from WebTestClient to check if fields are null? e.g. ```...

# spring

[Dariusz Kuc]

hello, any idea how to verify JSON response from WebTestClient to check if fields are null? e.g.

testClient.get()
    .uri("whatever")
    .accept(APPLICATION_JSON)
    .exchange()
    .expectStatus().isOk
    .expectBody()
    .jsonPath("$.whatever").isEqualTo(null) // NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS

If I enable jsr305=strict compiler settings the above fails complaining it expects non-null Any

[Dariusz Kuc]

using
• SpringBoot 2.2.1.RELEASE
• Kotlin 1.3.50

[Dariusz Kuc]

using Hamcrest IsNull.nullValue I'm getting expected:<null> but was:<null>

[Dariusz Kuc]

weird part is that isEqualTo ends up calling

public void assertValue(String content, @Nullable Object expectedValue)

which allows nullable value

[Dariusz Kuc]

any ideas?

[Dariusz Kuc]

if anyone is also looking for workaround this worked for me

jsonPath("$.whatever").value<String?> {
  assertNull(it)
}

[Ben]

Are you returning null or are you just asserting that the field isn't there?

[Dariusz Kuc]

response has explicit null

[Dariusz Kuc]

i.e.

{
  "whatever": null
}

[Ben]

You could probably use :

.json("""{"whatever":null}""")