build(deps): bump com.google.cloud:libraries-bom from 26.74.0 to 26.75.0 (GoogleCloudPlatform#4121)

* build(deps): bump com.google.cloud:libraries-bom from 26.74.0 to 26.75.0

Bumps [com.google.cloud:libraries-bom](https://github.com/googleapis/java-cloud-bom) from 26.74.0 to 26.75.0.
- [Release notes](https://github.com/googleapis/java-cloud-bom/releases)
- [Changelog](https://github.com/googleapis/java-cloud-bom/blob/main/release-please-config.json)
- [Commits](googleapis/java-cloud-bom@v26.74.0...v26.75.0)

---
updated-dependencies:
- dependency-name: com.google.cloud:libraries-bom
  dependency-version: 26.75.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* test: modify tests now that the session pool is gone

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Knut Olav Løite <koloite@gmail.com>

Author: dependabot[bot]

pom.xml

@@ -85,7 +85,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>libraries-bom</artifactId>
-        <version>26.74.0</version>
+        <version>26.75.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>

src/test/java/com/google/cloud/spanner/pgadapter/JdbcSimpleModeMockServerTest.java

@@ -33,12 +33,12 @@
 import com.google.protobuf.ListValue;
 import com.google.protobuf.Value;
 import com.google.spanner.admin.database.v1.UpdateDatabaseDdlRequest;
-import com.google.spanner.v1.BatchCreateSessionsRequest;
 import com.google.spanner.v1.CommitRequest;
 import com.google.spanner.v1.ExecuteSqlRequest;
 import com.google.spanner.v1.ExecuteSqlRequest.QueryMode;
 import com.google.spanner.v1.ResultSetStats;
 import com.google.spanner.v1.RollbackRequest;
+import com.google.spanner.v1.TransactionOptions.IsolationLevel;
 import com.google.spanner.v1.TypeCode;
 import io.grpc.Status;
 import java.math.BigDecimal;
@@ -940,12 +940,23 @@ public void testPrepareInDmlBatch() throws SQLException {
 
   @Test
   public void testStartupConnectionPropertiesInUrl() throws SQLException {
+    int numTransactions = 10;
     try (Connection connection =
         DriverManager.getConnection(
-            createUrl() + "&options=-c%20minSessions=10-c%20numChannels=1")) {}
-    assertEquals(1, mockSpanner.countRequestsOfType(BatchCreateSessionsRequest.class));
-    assertEquals(
-        10,
-        mockSpanner.getRequestsOfType(BatchCreateSessionsRequest.class).get(0).getSessionCount());
+            createUrl()
+                + "&options=-c%20default_isolation_level=REPEATABLE_READ-c%20numChannels=1")) {
+      connection.setAutoCommit(false);
+      for (int i = 0; i < numTransactions; i++) {
+        assertEquals(1, connection.createStatement().executeUpdate(INSERT_STATEMENT.getSql()));
+        connection.commit();
+      }
+    }
+    assertEquals(numTransactions, mockSpanner.countRequestsOfType(ExecuteSqlRequest.class));
+    for (ExecuteSqlRequest request : mockSpanner.getRequestsOfType(ExecuteSqlRequest.class)) {
+      assertTrue(request.hasTransaction());
+      assertTrue(request.getTransaction().hasBegin());
+      assertEquals(
+          IsolationLevel.REPEATABLE_READ, request.getTransaction().getBegin().getIsolationLevel());
+    }
   }
 }

src/test/java/com/google/cloud/spanner/pgadapter/SessionPoolSettingsTest.java

@@ -20,6 +20,7 @@
 
 import com.google.cloud.spanner.SessionPoolOptions;
 import com.google.spanner.v1.BatchCreateSessionsRequest;
+import com.google.spanner.v1.CreateSessionRequest;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
@@ -44,6 +45,7 @@ public static void startMockSpannerAndPgAdapterServers() throws Exception {
         null,
         builder ->
             builder
+                // The session pool has been removed and these settings are all deprecated.
                 .setSessionPoolOptions(
                     SessionPoolOptions.newBuilder()
                         .setMinSessions(20)
@@ -68,11 +70,8 @@ public void testSessionPoolInitialization() throws SQLException {
         assertFalse(resultSet.next());
       }
     }
-    // Check that the session pool options are honored.
-    assertEquals(5, mockSpanner.countRequestsOfType(BatchCreateSessionsRequest.class));
-    for (BatchCreateSessionsRequest createSessionsRequest :
-        mockSpanner.getRequestsOfType(BatchCreateSessionsRequest.class)) {
-      assertEquals(4, createSessionsRequest.getSessionCount());
-    }
+    // The Java client now always uses multiplexed sessions.
+    assertEquals(1, mockSpanner.countRequestsOfType(CreateSessionRequest.class));
+    assertEquals(0, mockSpanner.countRequestsOfType(BatchCreateSessionsRequest.class));
   }
 }