Testing Functions

Functions can also be run as part of the Micronaut application context for ease of testing. Similarly to the example above, this approach requires the function-web and an HTTP server dependency on the classpath for tests. For example, in build.gradle:

testImplementation("io.micronaut:micronaut-http-server-netty")

<dependency>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-http-server-netty</artifactId>
    <scope>test</scope>
</dependency>

testImplementation("io.micronaut:micronaut-function-web")

<dependency>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-function-web</artifactId>
    <scope>test</scope>
</dependency>

Create a @FunctionClient interface as shown below:

MathClient.groovy

import io.micronaut.function.client.FunctionClient
import javax.inject.Named
@FunctionClient
static interface MathClient {
    Long max() (1)
    @Named("round")
    int rnd(float value)
}

Now you can start up the Micronaut application and access your function via the client interface in your test.

void "test invoking a local function"() {
    given:
    EmbeddedServer server = ApplicationContext.run(EmbeddedServer)
    MathClient mathClient = server.getApplicationContext().getBean(MathClient)
    expect:
    mathClient.max() == Integer.MAX_VALUE.toLong()
    mathClient.rnd(1.6) == 2
    mathClient.sum(new Sum(a:5,b:10)) == 15
}