feat: least connections host selector strategy

Author: joyc-bq

Diff for: jest.integration.config.json

@@ -1,6 +1,6 @@
 {
   "moduleFileExtensions": ["ts", "js", "json"],
-  "testMatch": ["<rootDir>/tests/integration/container/tests/*.(spec|test).ts|tsx"],
+  "testMatch": ["<rootDir>/tests/integration/container/tests/fastest_response_strategy*.(spec|test).ts|tsx"],
   "transform": {
     "^.+\\.ts$": [
       "ts-jest",

Diff for: tests/integration/container/tests/fastest_response_strategy.test.ts

@@ -173,7 +173,7 @@ describe("aurora fastest response strategy", () => {
   );
 
   itIf(
-    "test set read only reuse cached connection",
+    "test secondary client use fastest connection",
     async () => {
       const config = await initDefaultConfig(env.databaseInfo.writerInstanceEndpoint, env.databaseInfo.instanceEndpointPort, false);
 
@@ -187,8 +187,8 @@ describe("aurora fastest response strategy", () => {
       await secondaryClient.connect();
 
       // connect using cached fastest connection
-      await client.setReadOnly(true);
-      const currentReaderId1 = await auroraTestUtility.queryInstanceId(client);
+      await secondaryClient.setReadOnly(true);
+      const currentReaderId1 = await auroraTestUtility.queryInstanceId(secondaryClient);
 
       expect(currentReaderId1).toStrictEqual(currentReaderId0);
       expect(client).not.toBe(secondaryClient);