From 71cfe1a874d550056d8b7facbc9b7acb04b92779 Mon Sep 17 00:00:00 2001
From: Christophe Bismuth <christophe.bismuth@gmail.com>
Date: Thu, 4 Oct 2018 14:46:24 +0200
Subject: [PATCH] Test sequence of updates (#28309)

---
 .../allocation/DiskThresholdSettingsTests.java   | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/server/src/test/java/org/elasticsearch/cluster/routing/allocation/DiskThresholdSettingsTests.java b/server/src/test/java/org/elasticsearch/cluster/routing/allocation/DiskThresholdSettingsTests.java
index 342fcea7ddef1..89c7b6738178d 100644
--- a/server/src/test/java/org/elasticsearch/cluster/routing/allocation/DiskThresholdSettingsTests.java
+++ b/server/src/test/java/org/elasticsearch/cluster/routing/allocation/DiskThresholdSettingsTests.java
@@ -203,4 +203,20 @@ public void testInvalidHighDiskThreshold() {
         assertThat(cause, hasToString(containsString("low disk watermark [85%] more than high disk watermark [75%]")));
     }
 
+    public void testSequenceOfUpdates() {
+        Settings settings = Settings.EMPTY;
+
+        final ClusterSettings clusterSettings = new ClusterSettings(settings, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS);
+        new DiskThresholdSettings(settings, clusterSettings); // this has the effect of registering the settings updater
+
+        settings = clusterSettings.applySettings(Settings.builder()
+            .put(settings)
+            .put(DiskThresholdSettings.CLUSTER_ROUTING_ALLOCATION_DISK_FLOOD_STAGE_WATERMARK_SETTING.getKey(), "99%")
+            .build());
+        settings = clusterSettings.applySettings(Settings.builder()
+            .put(settings)
+            .put(DiskThresholdSettings.CLUSTER_ROUTING_ALLOCATION_HIGH_DISK_WATERMARK_SETTING.getKey(), "97%")
+            .build());
+    }
+
 }