diff --git a/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/extensions/contentmodel/DTDHoverExtensionsTest.java b/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/extensions/contentmodel/DTDHoverExtensionsTest.java
index 01cc4dd115..175232aed3 100644
--- a/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/extensions/contentmodel/DTDHoverExtensionsTest.java
+++ b/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/extensions/contentmodel/DTDHoverExtensionsTest.java
@@ -77,11 +77,15 @@ public void webXML() throws Exception {
 
 			// Download the DTD by waiting 1 sec
 			CacheResourcesManager cacheResourcesManager = new CacheResourcesManager();
-			try {
-				cacheResourcesManager.getResource(httpDTDUri);
-			} catch (CacheResourceDownloadingException ignored) {
+			boolean downloaded = false;
+			while (!downloaded) {
+				try {
+					cacheResourcesManager.getResource(httpDTDUri);
+					downloaded = true;
+				} catch (CacheResourceDownloadingException ignored) {
+					TimeUnit.MILLISECONDS.sleep(100);
+				}
 			}
-			TimeUnit.MILLISECONDS.sleep(1000);
 			assertTrue(Files.exists(cachedFilePath),
 					"'" + cachedFilePath + "' file should be downloaded in the cache.");
 
diff --git a/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/uriresolver/CacheResourcesManagerTest.java b/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/uriresolver/CacheResourcesManagerTest.java
index f780d845d6..59fb2b79ba 100644
--- a/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/uriresolver/CacheResourcesManagerTest.java
+++ b/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/uriresolver/CacheResourcesManagerTest.java
@@ -71,11 +71,20 @@ public void testUnavailableCache() throws Exception {
 			fail("cacheResourcesManager should be busy downloading the url");
 		} catch (CacheResourceDownloadingException ignored) {
 		}
-		TimeUnit.MILLISECONDS.sleep(200);
-		// failed to download so returns null
-		assertNull(cacheResourcesManager.getResource(uri));
 
-		TimeUnit.SECONDS.sleep(1);// wait past the cache expiration date
+		boolean downloaded = false;
+		int i = 0;
+		while (!downloaded && i < 9) {
+			try {
+				TimeUnit.MILLISECONDS.sleep(100);
+				assertNull(cacheResourcesManager.getResource(uri));
+				downloaded = true;
+			} catch (CacheResourceDownloadingException e) {
+			}
+			i++;
+		}
+
+		TimeUnit.SECONDS.sleep(2);// wait past the cache expiration date
 
 		// Manager should retry downloading
 		try {
@@ -95,11 +104,21 @@ public void testAvailableCache() throws Exception {
 			fail("cacheResourcesManager should be busy downloading the url");
 		} catch (CacheResourceDownloadingException ignored) {
 		}
-		TimeUnit.MILLISECONDS.sleep(200);
-		assertNotNull(cacheResourcesManager.getResource(uri));
+
+		boolean downloaded = false;
+		int i = 0;
+		while (!downloaded && i < 9) {
+			try {
+				TimeUnit.MILLISECONDS.sleep(100);
+				assertNotNull(cacheResourcesManager.getResource(uri));
+				downloaded = true;
+			} catch (CacheResourceDownloadingException e) {
+			}
+			i++;
+		}
 
 		server.stop();
-		TimeUnit.SECONDS.sleep(1);// wait past the cache expiration date
+		TimeUnit.SECONDS.sleep(2);// wait past the cache expiration date
 
 		// Manager should return cached content, even if server is offline
 		assertNotNull(cacheResourcesManager.getResource(uri));