Aim for that last bit of code coverage

client_test.go

@@ -261,4 +261,19 @@ func TestPingLoop(t *testing.T) {
 			lastPing = m
 		}),
 	})
+
+	// This one is just for coverage, so we know we're hitting the
+	// branch that drops extra pings.
+	config.PingFrequency = 10 * time.Millisecond
+	config.PingTimeout = 100 * time.Millisecond
+	runTest(t, config, io.EOF, []TestAction{
+		ExpectLine("PASS :test_pass\r\n"),
+		ExpectLine("NICK :test_nick\r\n"),
+		ExpectLine("USER test_user 0.0.0.0 0.0.0.0 :test_name\r\n"),
+		SendLine("001 :hello_world\r\n"),
+		Delay(65 * time.Millisecond),
+		LineFunc(func(m *Message) {
+			lastPing = m
+		}),
+	})
 }