feat: code reformat and minor test cases fix due to renaming of Options.isolationLevel

Author: shobhitsg

google-cloud-spanner/src/main/java/com/google/cloud/spanner/SpannerOptions.java

@@ -1652,8 +1652,9 @@ public Builder setEnableEndToEndTracing(boolean enableEndToEndTracing) {
     }
 
     /**
-     * Provides the default read-write transaction options for all databases. These defaults are overridden by any explicit {@link
-     * com.google.cloud.spanner.Options.TransactionOption} provided through {@link DatabaseClient}.
+     * Provides the default read-write transaction options for all databases. These defaults are
+     * overridden by any explicit {@link com.google.cloud.spanner.Options.TransactionOption}
+     * provided through {@link DatabaseClient}.
      *
      * <p>Example Usage:
      *

google-cloud-spanner/src/test/java/com/google/cloud/spanner/DatabaseClientImplWithDefaultRWTransactionOptionsTest.java

@@ -57,9 +57,9 @@
 @RunWith(JUnit4.class)
 public class DatabaseClientImplWithDefaultRWTransactionOptionsTest {
   private static final TransactionOption SERIALIZABLE_ISOLATION_OPTION =
-      Options.isolationLevelOption(IsolationLevel.SERIALIZABLE);
+      Options.isolationLevel(IsolationLevel.SERIALIZABLE);
   private static final TransactionOption RR_ISOLATION_OPTION =
-      Options.isolationLevelOption(IsolationLevel.REPEATABLE_READ);
+      Options.isolationLevel(IsolationLevel.REPEATABLE_READ);
   private static final DatabaseId DATABASE_ID =
       DatabaseId.of("[PROJECT]", "[INSTANCE]", "[DATABASE]");
   private static MockSpannerServiceImpl mockSpanner;

google-cloud-spanner/src/test/java/com/google/cloud/spanner/OptionsTest.java

@@ -382,8 +382,7 @@ public void testTransactionOptionsPriority() {
   @Test
   public void testTransactionOptionsIsolationLevel() {
     Options options =
-        Options.fromTransactionOptions(
-            Options.isolationLevelOption(IsolationLevel.REPEATABLE_READ));
+        Options.fromTransactionOptions(Options.isolationLevel(IsolationLevel.REPEATABLE_READ));
     assertEquals(options.isolationLevel(), IsolationLevel.REPEATABLE_READ);
     assertEquals(
         "isolationLevel: " + IsolationLevel.REPEATABLE_READ.name() + " ", options.toString());
@@ -789,11 +788,9 @@ public void transactionOptionsExcludeTxnFromChangeStreams() {
   @Test
   public void transactionOptionsIsolationLevel() {
     Options option1 =
-        Options.fromTransactionOptions(
-            Options.isolationLevelOption(IsolationLevel.REPEATABLE_READ));
+        Options.fromTransactionOptions(Options.isolationLevel(IsolationLevel.REPEATABLE_READ));
     Options option2 =
-        Options.fromTransactionOptions(
-            Options.isolationLevelOption(IsolationLevel.REPEATABLE_READ));
+        Options.fromTransactionOptions(Options.isolationLevel(IsolationLevel.REPEATABLE_READ));
     Options option3 = Options.fromTransactionOptions();
 
     assertEquals(option1, option2);
@@ -870,8 +867,8 @@ public void testTransactionOptionCombine_WithNoSpannerOptions() {
   @Test
   public void testOptions_WithMultipleDifferentIsolationLevels() {
     TransactionOption[] transactionOptions = {
-      Options.isolationLevelOption(IsolationLevel.REPEATABLE_READ),
-      Options.isolationLevelOption(IsolationLevel.SERIALIZABLE)
+      Options.isolationLevel(IsolationLevel.REPEATABLE_READ),
+      Options.isolationLevel(IsolationLevel.SERIALIZABLE)
     };
     Options options = Options.fromTransactionOptions(transactionOptions);
     assertEquals(options.isolationLevel(), IsolationLevel.SERIALIZABLE);