bereng commented on code in PR #3917:
URL: https://github.com/apache/cassandra/pull/3917#discussion_r2041981169


##########
test/unit/org/apache/cassandra/cql3/PstmtPersistenceTest.java:
##########
@@ -142,19 +148,103 @@ public void testPstmtInvalidation() throws Throwable
 
         createTable("CREATE TABLE %s (key int primary key, val int)");
 
+        long initialEvicted = numberOfEvictedStatements();
+
         for (int cnt = 1; cnt < 10000; cnt++)
         {
             prepareStatement("INSERT INTO %s (key, val) VALUES (?, ?) USING 
TIMESTAMP " + cnt, clientState);
 
-            if (numberOfEvictedStatements() > 0)
+            if (numberOfEvictedStatements() - initialEvicted > 0)
             {
+                assertEquals("Number of statements in table and in cache don't 
match", numberOfStatementsInMemory(), numberOfStatementsOnDisk());
+
+                // prepare a more statements to trigger more evictions
+                for (int cnt2 = cnt + 1; cnt2 < cnt + 10; cnt2++)
+                    prepareStatement("INSERT INTO %s (key, val) VALUES (?, ?) 
USING TIMESTAMP " + cnt2, clientState);
+
+                // each new prepared statement should have caused an eviction
+                assertEquals("eviction count didn't increase by the expected 
number", 10, numberOfEvictedStatements() - initialEvicted);
+                assertEquals("Number of statements in memory (expected) and 
table (actual) don't match", numberOfStatementsInMemory(), 
numberOfStatementsOnDisk());
+
                 return;
             }
         }
 
         fail("Prepared statement eviction does not work");
     }
 
+
+
+    @Test
+    public void testAsyncPstmtInvalidation() throws Throwable

Review Comment:
   OK sgtm. I'd reuse other test cases but we're getting in personal taste 
territory and I prefer to favor authorship in this cases.



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