Bit field structures.

2026-07-16 22:39:29 +00:00 · 2019-12-09 10:44:16 +01:00
parent 89159e6cba
commit f6069bd3aa
6 changed files with 560 additions and 3 deletions
@@ -0,0 +1,68 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using SystemExtensions.Structures.BitStructures;
+
+namespace SystemExtensionsTests.Structures
+{
+    [TestClass]
+    public class Int32BitStructTests
+    {
+        [DataTestMethod]
+        [DataRow(-1)]
+        [DataRow(int.MaxValue)]
+        public void TestSetValueInt(int value)
+        {
+            Int32BitStruct int32 = value;
+            Assert.IsTrue(int32 == value);
+        }
+
+        [DataTestMethod]
+        [DataRow(1U)]
+        [DataRow(uint.MaxValue)]
+        public void TestSetValueUint(uint value)
+        {
+            Int32BitStruct int32 = value;
+            Assert.IsTrue(int32 == value);
+        }
+
+        [DataTestMethod]
+        [DataRow(0)]
+        [DataRow(int.MaxValue)]
+        [DataRow(int.MinValue)]
+        public void TestGetBit(int value)
+        {
+            Int32BitStruct int32 = value;
+            Assert.IsTrue(value >= 0 ? int32.Bit31 == 0 : int32.Bit31 == 1);
+        }
+
+        [DataTestMethod]
+        [DataRow(0U)]
+        [DataRow(1U)]
+        public void TestSetBit(uint value)
+        {
+            Int32BitStruct int32 = 0;
+            int32.Bit0 = value;
+            Assert.IsTrue(int32 == value);
+        }
+
+        [TestMethod]
+        public void TestUseCaseExample()
+        {
+            // Set value = -1, represented as MSB being 1 and the rest 0.
+            Int32BitStruct int32 = int.MinValue;
+
+            // Test that MSB is 1.
+            Assert.IsTrue(int32.Bit31 == 1);
+
+            // Set MSB to 0 and test that everything else is 0.
+            int32.Bit31 = 0;
+            Assert.IsTrue(int32 == 0);
+
+            // Set the least 31 significant bits (all besides MSB) to 1.
+            int32 = int.MaxValue;
+
+            // Set the MSB to 1 and test that everything is 1.
+            int32.Bit31 = 1;
+            Assert.IsTrue(int32 == uint.MaxValue);
+        }
+    }
+}