Add ramp-up/ramp-down test.

src/test/java/com/zaxxer/hikari/RampUpDown.java

@@ -0,0 +1,47 @@
+package com.zaxxer.hikari;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class RampUpDown
+{
+    @Test
+    public void rampUpDownTest() throws SQLException, InterruptedException
+    {
+        HikariConfig config = new HikariConfig();
+        config.setMinimumPoolSize(5);
+        config.setMaximumPoolSize(60);
+        config.setAcquireIncrement(1);
+        config.setConnectionTestQuery("VALUES 1");
+        config.setDataSourceClassName("com.zaxxer.hikari.mocks.StubDataSource");
+
+        System.setProperty("com.zaxxer.hikari.housekeeping.period", "250");
+
+        HikariDataSource ds = new HikariDataSource(config);
+        ds.setIdleTimeout(1000);
+
+        Assert.assertSame("Totals connections not as expected", 5, ds.pool.getTotalConnections());
+
+        Connection[] connections = new Connection[ds.getMaximumPoolSize()];
+        for (int i = 0; i < connections.length; i++)
+        {
+            connections[i] = ds.getConnection();
+        }
+
+        Assert.assertSame("Totals connections not as expected", 60, ds.pool.getTotalConnections());
+
+        for (Connection connection : connections)
+        {
+            connection.close();
+        }
+
+        Thread.sleep(2500);
+
+        Assert.assertSame("Totals connections not as expected", 5, ds.pool.getTotalConnections());
+
+        ds.shutdown();
+    }
+}