Add integration test for new config variables

Author: SangJunBak

src/environmentd/src/test_util.rs

@@ -279,6 +279,16 @@ impl TestHarness {
         self.builtin_system_cluster_config.size = builtin_system_cluster_replica_size;
         self
     }
+
+    pub fn with_builtin_system_cluster_replication_factor(
+        mut self,
+        builtin_system_cluster_replication_factor: u32,
+    ) -> Self {
+        self.builtin_system_cluster_config.replication_factor =
+            builtin_system_cluster_replication_factor;
+        self
+    }
+
     pub fn with_builtin_catalog_server_cluster_replica_size(
         mut self,
         builtin_catalog_server_cluster_replica_size: String,
@@ -287,7 +297,6 @@ impl TestHarness {
             builtin_catalog_server_cluster_replica_size;
         self
     }
-    // TODO: Add with_builtin_probe_cluster_replica_size
 
     pub fn with_propagate_crashes(mut self, propagate_crashes: bool) -> Self {
         self.propagate_crashes = propagate_crashes;

src/environmentd/tests/bootstrap_builtin_clusters.rs

@@ -0,0 +1,39 @@
+// Copyright Materialize, Inc. and contributors. All rights reserved.
+//G
+// Use of this software is governed by the Business Source License
+// included in the LICENSE file.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0.
+
+//! Integration tests for builtin clusters on bootstrap.
+
+use mz_environmentd::test_util::{self};
+
+// Test that a cluster with a replication factor of 0 should not create any replicas.
+#[mz_ore::test]
+fn test_zero_replication_factor_no_replicas() {
+    let server = test_util::TestHarness::default()
+        .with_builtin_system_cluster_replication_factor(0)
+        .start_blocking();
+
+    let mut client = server.connect(postgres::NoTls).unwrap();
+    let system_cluster = client
+        .query_one(
+            r#"
+    SELECT c.id, c.name, c.replication_factor::integer, COUNT(cr.id)::integer as replica_count 
+    FROM mz_clusters c
+    LEFT JOIN mz_cluster_replicas cr ON c.id = cr.cluster_id
+    WHERE c.name = 'mz_system'
+    GROUP BY c.id, c.name, c.replication_factor
+    "#,
+            &[],
+        )
+        .unwrap();
+
+    let replication_factor: i32 = system_cluster.get(2);
+    let replica_count: i32 = system_cluster.get(3);
+    assert_eq!(replication_factor, 0);
+    assert_eq!(replica_count, 0);
+}