diff --git a/solr/core/src/test/org/apache/solr/search/TestCaffeineCache.java b/solr/core/src/test/org/apache/solr/search/TestCaffeineCache.java
index ec951df04398..4ff90efce165 100644
--- a/solr/core/src/test/org/apache/solr/search/TestCaffeineCache.java
+++ b/solr/core/src/test/org/apache/solr/search/TestCaffeineCache.java
@@ -93,7 +93,9 @@ public void testSimple() throws IOException {
     assertEquals(3.0, hitDatapoint + missDatapoint, 0.001); // total lookups
     assertEquals(2.0, hitDatapoint, 0.001);
     assertEquals(101.0, insertDatapoint, 0.001);
-    assertNull(lfuCache.get(1));
+    // Exactly one entry is evicted; which one is up to Caffeine's eviction policy.
+    assertEquals(100, lfuCache.size());
+    assertEquals(1.0, evictionsDatapoint, 0.001);
 
     // Test autowarming
     newLFUCache.init(params, initObj, regenerator);
@@ -115,11 +117,11 @@ public void testSimple() throws IOException {
     var newInsertDatapoint = cumInsertDatapoint - insertDatapoint;
     var newEvictionDatapoint = cumEvictionsDatapoint - evictionsDatapoint;
     assertEquals(3.0, newHitDatapoint + missDatapoint, 0.001); // total lookups
-    assertEquals(2.0, newMissDatapoint, 0.001);
+    assertEquals(1.0, newMissDatapoint, 0.001);
     assertEquals(1.0, newInsertDatapoint, 0.001);
     assertEquals(0.0, newEvictionDatapoint, 0.001);
 
-    assertEquals(7.0, cumHitDatapoint + cumMissDatapoint, 0.001); // total cumulative lookups
+    assertEquals(6.0, cumHitDatapoint + cumMissDatapoint, 0.001); // total cumulative lookups
     assertEquals(4.0, cumHitDatapoint, 0.001);
     assertEquals(102.0, cumInsertDatapoint, 0.001);
 
diff --git a/solr/core/src/test/org/apache/solr/search/TestThinCache.java b/solr/core/src/test/org/apache/solr/search/TestThinCache.java
index 7d668a8e9ed5..79dfe8520588 100644
--- a/solr/core/src/test/org/apache/solr/search/TestThinCache.java
+++ b/solr/core/src/test/org/apache/solr/search/TestThinCache.java
@@ -148,7 +148,12 @@ public void testSimple() throws IOException {
     assertEquals(2L, hits);
     assertEquals(101L, inserts);
 
-    assertNull(lfuCache.get(1)); // first item put in should be the first out
+    // Exactly one entry is evicted; which one is up to Caffeine's eviction policy.
+    // lfuCache isn't registered for removals here, so check the backing cache's size.
+    assertEquals(100, backing.size());
+
+    // The backing is full; make room so warming doesn't evict the new cache's own entries.
+    backing.setMaxSize(200);
 
     // Test autowarming
     newLFUCache.init(Map.of("autowarmCount", "25"), initObj, regenerator);
@@ -164,7 +169,7 @@ public void testSimple() throws IOException {
     var newmiss = getNodeCacheLookups(metricManager, registry, newLfuCacheName, "miss");
     var newinserts = getNodeCacheOp(metricManager, registry, newLfuCacheName, "inserts");
     var evictions = getNodeCacheOp(metricManager, registry, newLfuCacheName, "evictions");
-    assertEquals(7L, newhits + newmiss);
+    assertEquals(6L, newhits + newmiss);
     assertEquals(4L, newhits);
     assertEquals(102L, newinserts);
     assertEquals(0L, evictions);