[e2e] Checking Broker's config search is case insensetive
### Issue submitter TODO list

- [X] I've searched for an already existing issues [here](https://github.com/provectus/kafka-ui/issues)
- [X] I'm running a supported version of the application which is listed [here](https://github.com/provectus/kafka-ui/blob/master/SECURITY.md) and the feature is not present there

### Is your proposal related to a problem?

_No response_

### Describe the feature you're interested in

autotest implementation for
https://app.qase.io/project/KAFKAUI?case=348&suite=1&tab=

### Describe alternatives you've considered

_No response_

### Version you're running

master

### Additional context

_No response_
kafka-ui-e2e-checks/src/main/java/com/provectus/kafka/ui/utilities/StringUtils.java
kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/manualsuite/backlog/SmokeBacklog.java kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/smokesuite/brokers/BrokersTest.java
diff --git a/kafka-ui-e2e-checks/src/main/java/com/provectus/kafka/ui/utilities/StringUtils.java b/kafka-ui-e2e-checks/src/main/java/com/provectus/kafka/ui/utilities/StringUtils.java
new file mode 100644
index 00000000000..77a46b805e9
--- /dev/null
+++ b/kafka-ui-e2e-checks/src/main/java/com/provectus/kafka/ui/utilities/StringUtils.java
@@ -0,0 +1,15 @@
+package com.provectus.kafka.ui.utilities;
+
+import java.util.stream.IntStream;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class StringUtils {
+
+  public static String getMixedCase(String original) {
+    return IntStream.range(0, original.length())
+        .mapToObj(i -> i % 2 == 0 ? Character.toUpperCase(original.charAt(i)) : original.charAt(i))
+        .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
+        .toString();
+  }
+}

diff --git a/kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/manualsuite/backlog/SmokeBacklog.java b/kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/manualsuite/backlog/SmokeBacklog.java
index f4cacc25207..eb82a50db1b 100644
--- a/kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/manualsuite/backlog/SmokeBacklog.java
+++ b/kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/manualsuite/backlog/SmokeBacklog.java
@@ -1,6 +1,5 @@
 package com.provectus.kafka.ui.manualsuite.backlog;
 
-import static com.provectus.kafka.ui.qasesuite.BaseQaseTest.BROKERS_SUITE_ID;
 import static com.provectus.kafka.ui.qasesuite.BaseQaseTest.SCHEMAS_SUITE_ID;
 import static com.provectus.kafka.ui.qasesuite.BaseQaseTest.TOPICS_PROFILE_SUITE_ID;
 import static com.provectus.kafka.ui.qasesuite.BaseQaseTest.TOPICS_SUITE_ID;
@@ -57,24 +56,17 @@ public void testCaseE() {
   public void testCaseF() {
   }
 
-  @Automation(state = TO_BE_AUTOMATED)
-  @Suite(id = BROKERS_SUITE_ID)
-  @QaseId(348)
-  @Test
-  public void testCaseG() {
-  }
-
   @Automation(state = NOT_AUTOMATED)
   @Suite(id = TOPICS_SUITE_ID)
   @QaseId(50)
   @Test
-  public void testCaseH() {
+  public void testCaseG() {
   }
 
   @Automation(state = NOT_AUTOMATED)
   @Suite(id = SCHEMAS_SUITE_ID)
   @QaseId(351)
   @Test
-  public void testCaseI() {
+  public void testCaseH() {
   }
 }
diff --git a/kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/smokesuite/brokers/BrokersTest.java b/kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/smokesuite/brokers/BrokersTest.java
index 663018cbc3b..ec1bbc2313e 100644
--- a/kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/smokesuite/brokers/BrokersTest.java
+++ b/kafka-ui-e2e-checks/src/test/java/com/provectus/kafka/ui/smokesuite/brokers/BrokersTest.java
@@ -1,6 +1,7 @@
 package com.provectus.kafka.ui.smokesuite.brokers;
 
 import static com.provectus.kafka.ui.pages.brokers.BrokersDetails.DetailsTab.CONFIGS;
+import static com.provectus.kafka.ui.utilities.StringUtils.getMixedCase;
 import static com.provectus.kafka.ui.variables.Expected.BROKER_SOURCE_INFO_TOOLTIP;
 
 import com.codeborne.selenide.Condition;
@@ -8,6 +9,7 @@
 import com.provectus.kafka.ui.pages.brokers.BrokersConfigTab;
 import io.qameta.allure.Issue;
 import io.qase.api.annotation.QaseId;
+import java.util.List;
 import org.testng.Assert;
 import org.testng.annotations.Ignore;
 import org.testng.annotations.Test;
@@ -100,6 +102,38 @@ public void brokersConfigSecondPageSearchCheck() {
         String.format("getAllConfigs().contains(%s)", anyConfigKeySecondPage));
   }
 
+  @Ignore
+  @Issue("https://github.com/provectus/kafka-ui/issues/3347")
+  @QaseId(348)
+  @Test
+  public void brokersConfigCaseInsensitiveSearchCheck() {
+    navigateToBrokersAndOpenDetails(DEFAULT_BROKER_ID);
+    brokersDetails
+        .openDetailsTab(CONFIGS);
+    String anyConfigKeyFirstPage = brokersConfigTab
+        .getAllConfigs().stream()
+        .findAny().orElseThrow()
+        .getKey();
+    brokersConfigTab
+        .clickNextButton();
+    Assert.assertFalse(brokersConfigTab.getAllConfigs().stream()
+            .map(BrokersConfigTab.BrokersConfigItem::getKey)
+            .toList().contains(anyConfigKeyFirstPage),
+        String.format("getAllConfigs().contains(%s)", anyConfigKeyFirstPage));
+    SoftAssert softly = new SoftAssert();
+    List.of(anyConfigKeyFirstPage.toLowerCase(), anyConfigKeyFirstPage.toUpperCase(),
+            getMixedCase(anyConfigKeyFirstPage))
+        .forEach(configCase -> {
+          brokersConfigTab
+              .searchConfig(configCase);
+          softly.assertTrue(brokersConfigTab.getAllConfigs().stream()
+                  .map(BrokersConfigTab.BrokersConfigItem::getKey)
+                  .toList().contains(anyConfigKeyFirstPage),
+              String.format("getAllConfigs().contains(%s)", configCase));
+        });
+    softly.assertAll();
+  }
+
   @QaseId(331)
   @Test
   public void brokersSourceInfoCheck() {
