refactor: split node agent and Go control plane

tests/node-agent/WxAgent.Core.Tests/WechatGroupMemberQueryTests.cs

@@ -0,0 +1,41 @@
+using WxAgent.Core;
+using Xunit;
+
+namespace WxAgent.Core.Tests;
+
+public sealed class WechatGroupMemberQueryTests
+{
+    [Fact]
+    public void QueryUsesStableIdsAndBoundParameters()
+    {
+        var parameters = WechatGroupMemberQuery.Parameters("123@chatroom", 2, 4).ToDictionary(pair => pair.Key, pair => pair.Value);
+        Assert.Equal("123@chatroom", parameters["$group"]);
+        Assert.Equal(3, parameters["$limit"]);
+        Assert.Equal(4, parameters["$offset"]);
+        Assert.Contains("c.id = m.member_id", WechatGroupMemberQuery.Sql);
+        Assert.Contains("ORDER BY m.member_id", WechatGroupMemberQuery.Sql);
+        Assert.DoesNotContain("123@chatroom", WechatGroupMemberQuery.Sql);
+    }
+
+    [Theory]
+    [InlineData("group")]
+    [InlineData("")]
+    [InlineData(" ")]
+    public void StableGroupUsernameIsRequired(string group) =>
+        Assert.Equal(WxAgentErrorCode.InvalidArgument,
+            Assert.Throws<WxAgentException>(() => WechatGroupMemberQuery.Parameters(group, 1, 0)).Code);
+
+    [Fact]
+    public void PagePreservesDuplicateDisplayNamesAndSignalsNextOffset()
+    {
+        WechatDatabaseGroupMember[] rows =
+        [
+            new(1, "one", "same", true), new(2, "two", "same", false), new(3, "three", "three", false)
+        ];
+        var page = WechatGroupMemberQuery.Page("123@chatroom", rows, 2, 4);
+        Assert.True(page.HasMore);
+        Assert.Equal(6, page.NextOffset);
+        Assert.Equal(new[] { "one", "two" }, page.Members.Select(member => member.Username));
+        Assert.True(page.Members[0].IsOwner);
+    }
+}