garydgregory commented on a change in pull request #40:
URL: https://github.com/apache/commons-dbcp/pull/40#discussion_r428679539



##########
File path: src/test/java/org/apache/commons/dbcp2/TestBasicDataSource.java
##########
@@ -916,6 +917,34 @@ public void testCreateConnectionFactory() throws Exception 
{
         conn.close();
         ds.close();
     }
+
+    @Test
+    public void testEvict() throws Exception {
+        ds.setInitialSize(10);
+        ds.setMaxIdle(10);
+        ds.setMaxTotal(10);
+        ds.setMinIdle(5);
+        ds.setNumTestsPerEvictionRun(3);
+        ds.setMinEvictableIdleTimeMillis(100);
+        ds.setTimeBetweenEvictionRunsMillis(1000);
+        ds.setPoolPreparedStatements(true);
+
+        Connection conn = ds.getConnection();
+        conn.close();
+
+        ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
+        while 
(Arrays.stream(threadBean.getThreadInfo(threadBean.getAllThreadIds()))
+                .anyMatch(t -> 
t.getThreadName().equals("commons-pool-evictor-thread"))) {
+            if (ds.getNumIdle() <= ds.getMinIdle()) {
+                break;
+            }
+            Thread.sleep(1000);

Review comment:
       If this `1000` matches the one above in the call to 
`setTimeBetweenEvictionRunsMillis`, it would make sense to refactor the value 
in a local variable to make obvious that these must indeed match.
   




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