Add test to command codestart

[holly-cummins]

A couple of times in the past few weeks I've tripped over the fact that the command codestart didn't have tests, and had to write some manually. This would be harder for people who didn't already know the structure of our testing framework.

[holly-cummins]

If I'm reading develocity right, all those failing tests only failed in my CI. I don't see how my changes could cause that, so I'll rebase and try again.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit b3d1b0f.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

---

Flaky tests - Develocity

⚙️ Gradle Tests - JDK 17 Windows

📦 integration-tests/gradle

❌ io.quarkus.gradle.devmode.IncludedKotlinKMPBuildDevModeTest.main - History

• Condition with Lambda expression in io.quarkus.test.devmode.util.DevModeClient was not fulfilled within 1 minutes 30 seconds. - org.awaitility.core.ConditionTimeoutException

Details

org.awaitility.core.ConditionTimeoutException: Condition with Lambda expression in io.quarkus.test.devmode.util.DevModeClient was not fulfilled within 1 minutes  30 seconds.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:78)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:26)
	at org.awaitility.core.ConditionFactory.until(ConditionFactory.java:1160)
	at org.awaitility.core.ConditionFactory.until(ConditionFactory.java:1129)
	at io.quarkus.test.devmode.util.DevModeClient.getHttpResponse(DevModeClient.java:164)
	at io.quarkus.gradle.devmode.QuarkusDevGradleTestBase.getHttpResponse(QuarkusDevGradleTestBase.java:165)

[ia3andy]

LGTM thanks Holly