added sanity checks

2026-09-18 14:10:24 +04:00
parent b5a8bd2580
commit 5797bf4884
44 changed files with 419 additions and 146 deletions
@@ -0,0 +1,108 @@
+namespace Just.PreciseMath.Tests.SanityChecks;
+
+public class DoubleDoubleArithmeticEqualityChecks
+{
+    public static IEnumerable<TheoryDataRow<double>> ReferenceCases => [1.0, 2.0, 3.0, 100.0, 0.1, 0.5, 0.333333333333333333, -1.0, 1553.0, 1.0e+10];
+
+    [Theory]
+    [MemberData(nameof(ReferenceCases))]
+    public void AdditionShouldProduceIdenticalResults(double reference)
+    {
+        DoubleDouble testValue = DoubleDouble.E; // any value with full precision range used
+
+        DoubleDouble ddxdd_Result = testValue + (new DoubleDouble(reference));
+        DoubleDouble ddxd_Result = testValue + reference;
+        DoubleDouble dxdd_Result = reference + testValue;
+
+        ddxdd_Result.High.ShouldBe(ddxd_Result.High);
+        ddxdd_Result.Low.ShouldBe(ddxd_Result.Low);
+        ddxdd_Result.ShouldBe(ddxd_Result);
+
+        ddxdd_Result.High.ShouldBe(dxdd_Result.High);
+        ddxdd_Result.Low.ShouldBe(dxdd_Result.Low);
+        ddxdd_Result.ShouldBe(dxdd_Result);
+
+        ddxd_Result.High.ShouldBe(dxdd_Result.High);
+        ddxd_Result.Low.ShouldBe(dxdd_Result.Low);
+        ddxd_Result.ShouldBe(dxdd_Result);
+    }
+
+    [Theory]
+    [MemberData(nameof(ReferenceCases))]
+    public void SubtractionFromShouldProduceIdenticalResults(double reference)
+    {
+        DoubleDouble testValue = DoubleDouble.E; // any value with full precision range used
+
+        DoubleDouble ddxdd_Result = testValue - (new DoubleDouble(reference));
+        DoubleDouble ddxd_Result = testValue - reference;
+
+        ddxdd_Result.High.ShouldBe(ddxd_Result.High);
+        ddxdd_Result.Low.ShouldBe(ddxd_Result.Low);
+        ddxdd_Result.ShouldBe(ddxd_Result);
+    }
+
+    [Theory]
+    [MemberData(nameof(ReferenceCases))]
+    public void SubtractionShouldProduceIdenticalResults(double reference)
+    {
+        DoubleDouble testValue = DoubleDouble.E; // any value with full precision range used
+
+        DoubleDouble ddxdd_Result = (new DoubleDouble(reference)) - testValue;
+        DoubleDouble dxdd_Result = reference - testValue;
+
+        ddxdd_Result.High.ShouldBe(dxdd_Result.High);
+        ddxdd_Result.Low.ShouldBe(dxdd_Result.Low);
+        ddxdd_Result.ShouldBe(dxdd_Result);
+    }
+
+    [Theory]
+    [MemberData(nameof(ReferenceCases))]
+    public void MultiplicationShouldProduceIdenticalResults(double reference)
+    {
+        DoubleDouble testValue = DoubleDouble.E; // any value with full precision range used
+
+        DoubleDouble ddxdd_Result = testValue * (new DoubleDouble(reference));
+        DoubleDouble ddxd_Result = testValue * reference;
+        DoubleDouble dxdd_Result = reference * testValue;
+
+        ddxdd_Result.High.ShouldBe(ddxd_Result.High);
+        ddxdd_Result.Low.ShouldBe(ddxd_Result.Low);
+        ddxdd_Result.ShouldBe(ddxd_Result);
+
+        ddxdd_Result.High.ShouldBe(dxdd_Result.High);
+        ddxdd_Result.Low.ShouldBe(dxdd_Result.Low);
+        ddxdd_Result.ShouldBe(dxdd_Result);
+
+        ddxd_Result.High.ShouldBe(dxdd_Result.High);
+        ddxd_Result.Low.ShouldBe(dxdd_Result.Low);
+        ddxd_Result.ShouldBe(dxdd_Result);
+    }
+
+    [Theory]
+    [MemberData(nameof(ReferenceCases))]
+    public void DivisionShouldProduceIdenticalResults(double reference)
+    {
+        DoubleDouble testValue = DoubleDouble.E; // any value with full precision range used
+
+        DoubleDouble ddxdd_Result = testValue / (new DoubleDouble(reference));
+        DoubleDouble ddxd_Result = testValue / reference;
+
+        ddxdd_Result.High.ShouldBe(ddxd_Result.High);
+        ddxdd_Result.Low.ShouldBe(ddxd_Result.Low);
+        ddxdd_Result.ShouldBe(ddxd_Result);
+    }
+
+    [Theory]
+    [MemberData(nameof(ReferenceCases))]
+    public void DivisionByShouldProduceIdenticalResults(double reference)
+    {
+        DoubleDouble testValue = DoubleDouble.E; // any value with full precision range used
+
+        DoubleDouble ddxdd_Result = (new DoubleDouble(reference)) / testValue;
+        DoubleDouble dxdd_Result = reference / testValue;
+
+        ddxdd_Result.High.ShouldBe(dxdd_Result.High);
+        ddxdd_Result.Low.ShouldBe(dxdd_Result.Low);
+        ddxdd_Result.ShouldBe(dxdd_Result);
+    }
+}