2 files changed, 45 insertions, 7 deletions
diff --git a/BackEnd/Timeline.Tests/IntegratedTests/TimelinePostTest.cs b/BackEnd/Timeline.Tests/IntegratedTests/TimelinePostTest.cs
index 0f264774..85db0908 100644
--- a/BackEnd/Timeline.Tests/IntegratedTests/TimelinePostTest.cs
+++ b/BackEnd/Timeline.Tests/IntegratedTests/TimelinePostTest.cs
@@ -401,13 +401,7 @@ namespace Timeline.Tests.IntegratedTests
 
             testDataList.AddRange(testData.Select(d => new List<HttpTimelinePostCreateRequestData>() { d! }));
 
-            foreach (var generatorTestData in TimelineNameGeneratorTestData())
-            {
-                var generator = generatorTestData[0];
-
-                foreach (var d in testDataList)
-                    yield return new object?[] { generator, d };
-            }
+            return TimelineNameGeneratorTestData().AppendTestData(testDataList);
         }
 
         [Theory]
diff --git a/BackEnd/Timeline.Tests/XUnitHelper.cs b/BackEnd/Timeline.Tests/XUnitHelper.cs
new file mode 100644
index 00000000..a2812ad3
--- /dev/null
+++ b/BackEnd/Timeline.Tests/XUnitHelper.cs
@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Timeline.Tests
+{
+    public static class XUnitHelper
+    {
+        public static IEnumerable<object?[]> ComposeTestData(params IEnumerable<object?[]>[] testDatas)
+        {
+            return ComposeTestData(new ArraySegment<IEnumerable<object?[]>>(testDatas));
+        }
+
+        public static IEnumerable<object?[]> ComposeTestData(ArraySegment<IEnumerable<object?[]>> testDatas)
+        {
+            if (testDatas.Count == 0)
+                throw new ArgumentException("Test data list can't be empty.", nameof(testDatas));
+
+            if (testDatas.Count == 1)
+            {
+                foreach (var d in testDatas[0])
+                    yield return d;
+            }
+            else
+            {
+                foreach (var head in testDatas[0])
+                    foreach (var rest in ComposeTestData(testDatas.Slice(1)))
+                        yield return head.Concat(rest).ToArray();
+            }
+        }
+
+        public static IEnumerable<object?[]> AppendTestData(this IEnumerable<object?[]> origin, params IEnumerable<object?>[] toAppend)
+        {
+            IEnumerable<object?[]> result = origin;
+
+            foreach (var oneToAppend in toAppend)
+            {
+                result = ComposeTestData(result, oneToAppend.Select(testData => new object?[] { testData }));
+            }
+
+            return result;
+        }
+    }
+}