feat: add hide_history_before option when adding members (#214)

* feat: add hide_history_before option when adding members

* Test serialization of hideHistoryBefore

* Add proper test

* Remove serialization test

* Create separate channel for test

* Fix lint

Author: Acconut

src/main/java/io/getstream/chat/java/models/Channel.java

@@ -601,6 +601,10 @@ public static class ChannelUpdateRequestData {
     @JsonProperty("hide_history")
     private Boolean hideHistory;
 
+    @Nullable
+    @JsonProperty("hide_history_before")
+    private Date hideHistoryBefore;
+
     @Nullable
     @JsonProperty("data")
     private ChannelRequestObject data;

src/test/java/io/getstream/chat/java/ChannelTest.java

@@ -8,9 +8,13 @@
 import io.getstream.chat.java.models.Sort.Direction;
 import io.getstream.chat.java.models.User;
 import io.getstream.chat.java.models.User.ChannelMute;
+import io.getstream.chat.java.models.User.UserRequestObject;
 import java.util.Arrays;
+import java.util.Calendar;
 import java.util.Date;
+import java.util.GregorianCalendar;
 import java.util.List;
+import java.util.TimeZone;
 import java.util.stream.Collectors;
 import org.apache.commons.lang3.RandomStringUtils;
 import org.junit.jupiter.api.Assertions;
@@ -640,4 +644,47 @@ void whenMarkingDeliveredWithLastDeliveredMessages_thenNoException() {
                 .latestDeliveredMessages(latestDeliveredMessages)
                 .request());
   }
+
+  @DisplayName("hide_messages_before is set when adding member with hide_history_before")
+  @Test
+  void whenAddingMemberWithHideHistoryBefore_thenHideMessagesBeforeIsSet() {
+    // Create new test user
+    UserRequestObject newMember =
+        UserRequestObject.builder()
+            .id(RandomStringUtils.randomAlphabetic(10))
+            .name("New Member 1")
+            .build();
+
+    Assertions.assertDoesNotThrow(() -> User.upsert().user(newMember).request());
+
+    // Create test channel
+    Channel channel = Assertions.assertDoesNotThrow(() -> createRandomChannel()).getChannel();
+
+    // Create a static timestamp for hide_history_before
+    Calendar calendar = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
+    calendar.set(2025, Calendar.JANUARY, 15, 10, 30, 0);
+    calendar.set(Calendar.MILLISECOND, 0);
+    Date hideBeforeTimestamp = calendar.getTime();
+
+    // Add ember with hide_history_before
+    Assertions.assertDoesNotThrow(
+        () ->
+            Channel.update(channel.getType(), channel.getId())
+                .addMember(newMember.getId())
+                .hideHistoryBefore(hideBeforeTimestamp)
+                .request());
+
+    // Query channel with state for newMember - should have hide_messages_before set
+    String userToken = User.createToken(newMember.getId(), null, null);
+    ChannelGetResponse channelResponse =
+        Assertions.assertDoesNotThrow(
+            () ->
+                Channel.getOrCreate(channel.getType(), channel.getId())
+                    .state(true)
+                    .withUserToken(userToken)
+                    .request());
+
+    Assertions.assertNotNull(channelResponse.getHideMessagesBefore());
+    Assertions.assertEquals(hideBeforeTimestamp, channelResponse.getHideMessagesBefore());
+  }
 }