ci,tests,core: apply stashed updates

- CI: update .github/workflows/build-and-test.yml
- tests: adjust RandomUtility_Nullable_Tests
- core: refine RandomUtility.Nullable and RandomUtility.Tuple

Author: s2quake

.github/workflows/build-and-test.yml

@@ -4,7 +4,8 @@ on:
   pull_request:
   push:
     branches:
-      - dev
+      - main
+  
   workflow_dispatch:
 
 env:

src/JSSoft.Randora/RandomUtility.Nullable.cs

@@ -3,8 +3,6 @@
 //   Licensed under the MIT License. See LICENSE.md in the project root for license information.
 // </copyright>
 
-#pragma warning disable MEN002 // Line is too long
-
 namespace JSSoft.Randora;
 
 public static partial class RandomUtility

src/JSSoft.Randora/RandomUtility.Tuple.cs

@@ -3,7 +3,6 @@
 //   Licensed under the MIT License. See LICENSE.md in the project root for license information.
 // </copyright>
 
-#pragma warning disable MEN002 // Line is too long
 #pragma warning disable SA1414 // Tuple types in signatures should have element names
 namespace JSSoft.Randora;
 

test/JSSoft.Randora.Tests/RandomUtility_Nullable_Tests.cs

@@ -988,4 +988,38 @@ public void NullableValueTuple_Ints_WithRandom_Basic()
             Assert.IsType<DateTime>(t8.Value.Rest.Item1);
         }
     }
+
+    // Generic helpers ----------------------------------------------------
+
+    [Fact]
+    public void Nullable_Int_WithRandom_ShouldContainNullAndValue()
+    {
+        var r = NewSeeded();
+        const int iterations = 128; // 66% 값 생성 확률을 고려한 충분한 반복
+        var results = new List<int?>(capacity: iterations);
+
+        for (int i = 0; i < iterations; i++)
+        {
+            results.Add(R.Nullable(r, R.Int32));
+        }
+
+        Assert.Contains(results, v => v.HasValue);
+        Assert.Contains(results, v => v is null);
+    }
+
+    [Fact]
+    public void NullableObject_String_WithRandom_ShouldContainNullAndValue()
+    {
+        var r = NewSeeded();
+        const int iterations = 128;
+        var results = new List<string?>(capacity: iterations);
+
+        for (int i = 0; i < iterations; i++)
+        {
+            results.Add(R.NullableObject(r, R.String));
+        }
+
+        Assert.Contains(results, v => v is not null);
+        Assert.Contains(results, v => v is null);
+    }
 }