private ApplicationId app(String tenant) {
        return new ApplicationId.Builder()
                .tenant(tenant)
                .applicationName("test")
                .instanceName("default").build();
    }
Graphically run allocation procedure to ease manual comprehension.

Extremely useful when trying to understand test cases and build corner cases.
node-repository/src/test/java/com/yahoo/vespa/hosted/provision/provisioning/AllocationSimulator.java