Captured Outputs

CapturedOutputs is a thread-safe store for values produced during the whenever step — HTTP responses, returned objects, database query results, etc. Stored values are available in then for assertions and appear in the Captured Outputs tab of the HTML report.

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Typed Keys

The preferred approach is to define a typed key upfront. This gives you compile-time safety on both put and get.

Kotlin

// Define once, e.g. as a companion object field or top-level val
val response = capturedOutput<HttpResponse>("response")

class PaymentTest : KensaTest, WithKotest {

    @Test
    fun `payment is accepted`() {
        given { /* ... */ }
        whenever { ctx ->
            ctx.outputs.put(response, paymentGateway.submit(ctx.fixtures[paymentRequest]))
        }
        then({ ctx -> ctx.outputs[response] }) {
            it.statusCode shouldBe 200
        }
    }
}

Java

import static dev.kensa.outputs.CapturedOutputsKt.createCapturedOutput;

static final CapturedOutput<HttpResponse> RESPONSE =
    createCapturedOutput("response", HttpResponse.class);

@Test
void paymentIsAccepted() {
    given(ctx -> { /* ... */ });
    whenever(ctx -> ctx.getOutputs().put(RESPONSE,
        paymentGateway.submit(ctx.getFixtures().get(PAYMENT_REQUEST))));
    then(ctx -> ctx.getOutputs().get(RESPONSE),
        response -> assertThat(response.statusCode()).isEqualTo(200));
}

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String Keys

For quick, untyped access — useful when the value type is obvious from context:

Kotlin

whenever { ctx ->
    ctx.outputs.put("response", httpClient.post("/payments", body))
}
then({ ctx -> ctx.outputs["response"] as HttpResponse }) {
    it.statusCode shouldBe 200
}

Java

whenever(ctx -> ctx.getOutputs().put("response", httpClient.post("/payments", body)));
then(ctx -> (HttpResponse) ctx.getOutputs().get("response"),
    response -> assertThat(response.statusCode()).isEqualTo(200));

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API Reference

capturedOutput<T>() factory (Kotlin)

inline fun <reified T : Any> capturedOutput(
    key: String,
    highlighted: Boolean = false
): CapturedOutput<T>

createCapturedOutput() factory (Java)

createCapturedOutput(String key, Class<T> type)
createCapturedOutput(String key, Class<T> type, boolean highlighted)

CapturedOutputs methods

Method	Description
put(key: String, value: Any)	Store by string key
put(key: CapturedOutput<T>, value: T)	Store by typed key
outputs[key] / get(key)	Retrieve by string key (throws if absent)
outputs[key] / get(key: CapturedOutput<T>)	Retrieve by typed key (throws if absent)
getOrNull(key)	Retrieve by string or typed key, returns null if absent
contains(key)	Check for presence by string or typed key
values()	All stored values as Set<NamedValue>
highlightedValues()	Only highlighted values

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Highlighting

Highlighted outputs appear prominently in the report. Pass highlighted = true when creating the key:

Kotlin

val transactionId = capturedOutput<String>("transaction id", highlighted = true)

whenever { ctx ->
    val result = paymentGateway.submit(ctx.fixtures[paymentRequest])
    ctx.outputs.put(transactionId, result.transactionId)
}

Java

static final CapturedOutput<String> TRANSACTION_ID =
    createCapturedOutput("transaction id", String.class, true);

// In whenever:
ctx.getOutputs().put(TRANSACTION_ID, result.getTransactionId());