test: update tests for int64 arange return type

- IndexingEdgeCaseTests.cs: GetInt32 → GetInt64 for arange-based arrays
- LinearAlgebraTests.cs: GetInt32 → GetInt64 for dot product tests
- NDArray.Base.Test.cs: GetInt32 → GetInt64 for base memory tests

np.arange now returns Int64 (NumPy 2.x alignment), so tests must use
GetInt64() instead of GetInt32() to access values correctly.

Author: Nucs

test/NumSharp.UnitTest/Backends/Kernels/IndexingEdgeCaseTests.cs

@@ -86,8 +86,8 @@ public void NegativeSlice_2D_Corner()
 
         Assert.AreEqual(2, result.shape[0]);
         Assert.AreEqual(2, result.shape[1]);
-        Assert.AreEqual(6, result.GetInt32(0, 0));
-        Assert.AreEqual(11, result.GetInt32(1, 1));
+        Assert.AreEqual(6L, result.GetInt64(0, 0));
+        Assert.AreEqual(11L, result.GetInt64(1, 1));
     }
 
     [Test]
@@ -98,8 +98,8 @@ public void NegativeSlice_2D_FullReverse()
 
         var result = arr["::-1, ::-1"];
 
-        Assert.AreEqual(11, result.GetInt32(0, 0));
-        Assert.AreEqual(0, result.GetInt32(2, 3));
+        Assert.AreEqual(11L, result.GetInt64(0, 0));
+        Assert.AreEqual(0L, result.GetInt64(2, 3));
     }
 
     #endregion
@@ -151,7 +151,7 @@ public void BooleanIndex_2D_Flattens()
 
         Assert.AreEqual(1, result.ndim);  // Flattened to 1D
         Assert.AreEqual(6, result.size);
-        Assert.AreEqual(6, result.GetInt32(0));
+        Assert.AreEqual(6L, result.GetInt64(0));
     }
 
     [Test]
@@ -166,8 +166,8 @@ public void BooleanIndex_RowSelection()
 
         Assert.AreEqual(2, result.shape[0]);
         Assert.AreEqual(4, result.shape[1]);
-        Assert.AreEqual(0, result.GetInt32(0, 0));
-        Assert.AreEqual(8, result.GetInt32(1, 0));
+        Assert.AreEqual(0L, result.GetInt64(0, 0));
+        Assert.AreEqual(8L, result.GetInt64(1, 0));
     }
 
     #endregion

test/NumSharp.UnitTest/Backends/Kernels/LinearAlgebraTests.cs

@@ -123,9 +123,9 @@ public void Dot_1D_2D_Larger()
 
         Assert.AreEqual(1, result.ndim);
         Assert.AreEqual(3, result.size);
-        Assert.AreEqual(120, result.GetInt32(0));
-        Assert.AreEqual(135, result.GetInt32(1));
-        Assert.AreEqual(150, result.GetInt32(2));
+        Assert.AreEqual(120L, result.GetInt64(0));
+        Assert.AreEqual(135L, result.GetInt64(1));
+        Assert.AreEqual(150L, result.GetInt64(2));
     }
 
     [Test]

test/NumSharp.UnitTest/Backends/NDArray.Base.Test.cs

@@ -263,13 +263,13 @@ public void Base_CopyBreaksChain()
         public void Base_ViewKeepsDataAlive()
         {
             NDArray view;
-            int expectedValue;
+            long expectedValue;
 
             // Create original in inner scope
             {
                 var original = np.arange(10);
                 view = original["2:5"];
-                expectedValue = (int)original.GetInt32(2);
+                expectedValue = original.GetInt64(2);
             }
 
             // Force GC
@@ -278,7 +278,7 @@ public void Base_ViewKeepsDataAlive()
             GC.Collect();
 
             // View should still have valid data
-            view.GetInt32(0).Should().Be(expectedValue);
+            view.GetInt64(0).Should().Be(expectedValue);
         }
 
         /// <summary>
@@ -302,7 +302,7 @@ public void Base_NestedViews_KeepDataAlive()
 
             // deepView should still be valid
             deepView.size.Should().Be(40);
-            deepView.GetInt32(0).Should().Be(30); // a[30]
+            deepView.GetInt64(0).Should().Be(30L); // a[30]
         }
 
         /// <summary>