tests: unflake max staleness read tests (#86)

Author: olavloite

src/test/java/com/google/cloud/spanner/jdbc/it/ITJdbcReadOnlyTest.java

@@ -84,6 +84,8 @@ public void createTestTables() throws Exception {
 
   @Test
   public void testSqlScript() throws Exception {
+    // Wait 100ms to ensure that staleness tests in the script succeed.
+    Thread.sleep(100L);
     JdbcSqlScriptVerifier verifier = new JdbcSqlScriptVerifier(new ITJdbcConnectionProvider());
     verifier.verifyStatementsInFile("ITReadOnlySpannerTest.sql", SqlScriptVerifier.class);
   }

src/test/java/com/google/cloud/spanner/jdbc/it/ITReadOnlySpannerTest.java

@@ -101,6 +101,8 @@ public void createTestTables() throws Exception {
 
   @Test
   public void testSqlScript() throws Exception {
+    // Wait 100ms to ensure that staleness tests in the script succeed.
+    Thread.sleep(100L);
     SqlScriptVerifier verifier = new SqlScriptVerifier(new ITConnectionProvider());
     verifier.verifyStatementsInFile("ITReadOnlySpannerTest.sql", SqlScriptVerifier.class);
   }

src/test/resources/com/google/cloud/spanner/jdbc/ITReadOnlySpannerTest.sql

@@ -109,9 +109,9 @@ SHOW VARIABLE READ_TIMESTAMP;
 
 
 NEW_CONNECTION;
---TimestampBound.ofExactStaleness(100, TimeUnit.MILLISECONDS),
+--TimestampBound.ofExactStaleness(1, TimeUnit.MILLISECONDS),
 
-SET READ_ONLY_STALENESS = 'EXACT_STALENESS 100ms';
+SET READ_ONLY_STALENESS = 'EXACT_STALENESS 1ms';
 
 @EXPECT RESULT_SET
 SELECT COUNT(*) AS ACTUAL, 1000 AS EXPECTED FROM NUMBERS;