SpringBoot WebTestClient doesn't capture URL Template when using UriBuilder/uriFunction

When using uriFunction to construct URIs using the UriBuilder the URL Template is not captured.

Test

package com.example.restdocs.demo

import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.test.web.reactive.server.WebTestClient

@SpringBootTest
@AutoConfigureWebTestClient
internal class DemoControllerTest(
    @Autowired private val webTestClient: WebTestClient
) {
    @Test
    fun `should return uriTemplate from UriBuilder`() {
        webTestClient.get().uri { it.path("/demo").build() }
            .exchange().expectBody()
            .consumeWith { assertThat(it.uriTemplate).isEqualTo("/demo?foo=bar") }
    }

    @Test
    fun `should return uriTemplate from URI`() {
        webTestClient.get().uri("/demo")
            .exchange().expectBody().consumeWith { assertThat(it.uriTemplate).isEqualTo("/demo?foo=bar") }
    }
}

build.gradle.kts

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    id("org.springframework.boot") version "2.7.2"
    id("io.spring.dependency-management") version "1.0.12.RELEASE"
    id("org.asciidoctor.convert") version "1.5.8"
    kotlin("jvm") version "1.6.21"
    kotlin("plugin.spring") version "1.6.21"
}

group = "com.example.restdocs"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_17

repositories {
    mavenCentral()
}

val snippetsDir = file("build/generated-snippets")

dependencies {
    implementation("org.springframework.boot:spring-boot-starter-webflux")
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
    testImplementation("org.springframework.boot:spring-boot-starter-test")
    testImplementation("io.projectreactor:reactor-test")
    testImplementation("org.springframework.restdocs:spring-restdocs-webtestclient")
}

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xjsr305=strict")
        jvmTarget = "17"
    }
}

val test = tasks.withType<Test> {
    useJUnitPlatform()
}

tasks.test {
    outputs.dir(snippetsDir)
}

tasks.asciidoctor {
    inputs.dir(snippetsDir)
    dependsOn(test)
}

Comment From: wilkinsona

A template isn't created when using the UriBuilder. You should use one of the methods on WebTestClient.UriSpec that state in their javadoc that they work with a template instead. Also, please note that WebTestClient and WebClient are part of Spring Framework which is managed as a separate project.