test: name and group fixtures by behavior

tests/Lua.Tests/BitwiseLibraryReviewTests.cs → tests/Lua.Tests/BitwiseLibraryTests.cs

@@ -2,7 +2,7 @@
 
 namespace Lua.Tests;
 
-public class BitwiseLibraryReviewTests
+public class BitwiseLibraryTests
 {
     static LuaState CreateState()
     {

tests/Lua.Tests/CompilerConstantBoundaryTests.cs

@@ -0,0 +1,32 @@
+using System.Text;
+using Lua.CodeAnalysis.Syntax;
+using Lua.CodeAnalysis.Syntax.Nodes;
+using Lua.Platforms;
+using Lua.Runtime;
+using Lua.Standard;
+
+namespace Lua.Tests;
+
+public class CompilerConstantBoundaryTests
+{
+    [Test]
+    public async Task ConstantBeyondBxUsesLoadKxAndRoundTrips()
+    {
+        using var state = LuaState.Create();
+        var source = new StringBuilder("local x\n");
+        for (var i = 0; i <= Instruction.MaxArgBx + 1; i++)
+            source.Append("x=").Append(i).Append('\n');
+        source.Append("return x");
+        var closure = state.Load(source.ToString(), "large-constants");
+        Assert.That(closure.Proto.Code.ToArray().Any(i => i.OpCode == OpCode.LoadKX), Is.True);
+        Assert.That(
+            (await state.ExecuteAsync(closure))[0].Read<double>(),
+            Is.EqualTo(Instruction.MaxArgBx + 1)
+        );
+        var restored = state.Load(closure.Proto.ToBytecode(), "large-constants-roundtrip");
+        Assert.That(
+            (await state.ExecuteAsync(restored))[0].Read<double>(),
+            Is.EqualTo(Instruction.MaxArgBx + 1)
+        );
+    }
+}

tests/Lua.Tests/CompilerReviewTests.cs → tests/Lua.Tests/CompilerTests.cs

@@ -9,7 +9,7 @@ namespace Lua.Tests;
 
 [TestFixture(LuaStringMode.Utf16)]
 [TestFixture(LuaStringMode.Bytes)]
-public class CompilerReviewTests(LuaStringMode stringMode)
+public class CompilerTests(LuaStringMode stringMode)
 {
     LuaState CreateState()
     {
@@ -127,27 +127,3 @@ public async Task SyntaxDepthFailureRestoresCounter()
         Assert.That((await state.DoStringAsync("return 42"))[0].Read<double>(), Is.EqualTo(42));
     }
 }
-
-public class CompilerConstantBoundaryTests
-{
-    [Test]
-    public async Task ConstantBeyondBxUsesLoadKxAndRoundTrips()
-    {
-        using var state = LuaState.Create();
-        var source = new StringBuilder("local x\n");
-        for (var i = 0; i <= Instruction.MaxArgBx + 1; i++)
-            source.Append("x=").Append(i).Append('\n');
-        source.Append("return x");
-        var closure = state.Load(source.ToString(), "large-constants");
-        Assert.That(closure.Proto.Code.ToArray().Any(i => i.OpCode == OpCode.LoadKX), Is.True);
-        Assert.That(
-            (await state.ExecuteAsync(closure))[0].Read<double>(),
-            Is.EqualTo(Instruction.MaxArgBx + 1)
-        );
-        var restored = state.Load(closure.Proto.ToBytecode(), "large-constants-roundtrip");
-        Assert.That(
-            (await state.ExecuteAsync(restored))[0].Read<double>(),
-            Is.EqualTo(Instruction.MaxArgBx + 1)
-        );
-    }
-}

tests/Lua.Tests/FrexpReconstructionTests.cs

@@ -0,0 +1,30 @@
+using Lua.Standard;
+
+namespace Lua.Tests;
+
+public class FrexpReconstructionTests
+{
+    [Test]
+    public void FiniteValuesNormalizeAndReconstructBitExactly()
+    {
+        var random = new Random(0x52);
+        for (var i = 0; i < 4096; i++)
+        {
+            var bits = random.NextInt64(long.MinValue, long.MaxValue);
+            if ((i & 1) == 0)
+                bits &= unchecked((long)0x800fffffffffffff); // Include subnormals.
+            var input = BitConverter.Int64BitsToDouble(bits);
+            if (!double.IsFinite(input))
+                continue;
+            var (mantissa, exponent) = MathEx.Frexp(input);
+            if (input == 0)
+                Assert.That(exponent, Is.Zero);
+            else
+                Assert.That(Math.Abs(mantissa), Is.GreaterThanOrEqualTo(0.5).And.LessThan(1));
+            Assert.That(
+                BitConverter.DoubleToInt64Bits(Math.ScaleB(mantissa, exponent)),
+                Is.EqualTo(bits)
+            );
+        }
+    }
+}

tests/Lua.Tests/LuaStackCapacityTests.cs

@@ -0,0 +1,16 @@
+using Lua.Runtime;
+
+namespace Lua.Tests;
+
+public class LuaStackCapacityTests
+{
+    [Test]
+    public void EmptyStackCanGrowAndRejectsOverflowingCapacity()
+    {
+        var stack = new LuaStack(0);
+        stack.Push(42);
+        Assert.That(stack.Pop().Read<double>(), Is.EqualTo(42));
+        Assert.Throws<LuaStackOverflowException>(() => stack.EnsureCapacity(int.MaxValue));
+        Assert.That(stack.Count, Is.Zero);
+    }
+}

tests/Lua.Tests/MathematicsLibraryReviewTests.cs → tests/Lua.Tests/MathematicsLibraryTests.cs

@@ -2,7 +2,7 @@
 
 namespace Lua.Tests;
 
-public class MathematicsLibraryReviewTests
+public class MathematicsLibraryTests
 {
     static LuaState CreateState()
     {
@@ -66,31 +66,61 @@ public async Task AngleConversionsAndFrexpPreserveBothZeroSigns()
                 Assert.That(values[1].Read<double>(), Is.Zero);
         }
     }
-}
 
-public class FrexpReconstructionTests
-{
-    [Test]
-    public void FiniteValuesNormalizeAndReconstructBitExactly()
+    [TestCase(-0.0)]
+    [TestCase(-1d)]
+    [TestCase(-1.5)]
+    [TestCase(1e20)]
+    [TestCase(-1e20)]
+    [TestCase(double.Epsilon)]
+    [TestCase(-double.Epsilon)]
+    [TestCase(double.PositiveInfinity)]
+    [TestCase(double.NegativeInfinity)]
+    [TestCase(double.NaN)]
+    public async Task ModfKeepsDoubleRangeAndSignedFractionalZero(double number)
     {
-        var random = new Random(0x52);
-        for (var i = 0; i < 4096; i++)
+        using var state = CreateState();
+        var values = await state.CallAsync(
+            state.Environment["math"].Read<LuaTable>()["modf"],
+            [number]
+        );
+        var integral = values[0].Read<double>();
+        var fraction = values[1].Read<double>();
+        if (double.IsNaN(number))
         {
-            var bits = random.NextInt64(long.MinValue, long.MaxValue);
-            if ((i & 1) == 0)
-                bits &= unchecked((long)0x800fffffffffffff); // Include subnormals.
-            var input = BitConverter.Int64BitsToDouble(bits);
-            if (!double.IsFinite(input))
-                continue;
-            var (mantissa, exponent) = MathEx.Frexp(input);
-            if (input == 0)
-                Assert.That(exponent, Is.Zero);
-            else
-                Assert.That(Math.Abs(mantissa), Is.GreaterThanOrEqualTo(0.5).And.LessThan(1));
+            Assert.That(double.IsNaN(integral) && double.IsNaN(fraction), Is.True);
+            return;
+        }
+        Assert.That(
+            BitConverter.DoubleToInt64Bits(integral),
+            Is.EqualTo(BitConverter.DoubleToInt64Bits(Math.Truncate(number)))
+        );
+        if (double.IsInfinity(number) || number == Math.Truncate(number))
             Assert.That(
-                BitConverter.DoubleToInt64Bits(Math.ScaleB(mantissa, exponent)),
-                Is.EqualTo(bits)
+                BitConverter.DoubleToInt64Bits(fraction),
+                Is.EqualTo(BitConverter.DoubleToInt64Bits(number) & long.MinValue)
             );
-        }
+        else
+            Assert.That(integral + fraction, Is.EqualTo(number));
+    }
+
+    [Test]
+    public async Task RandomSeedsAreNumericAndRepeatable()
+    {
+        using var state = CreateState();
+        await state.DoStringAsync(
+            """
+            local function sequence(seed)
+                math.randomseed(seed)
+                local t={}; for i=1,8 do t[i]=math.random() end
+                return table.concat(t,',')
+            end
+            assert(sequence(1)==sequence(1))
+            assert(sequence(1)~=sequence(2))
+            assert(sequence('1')==sequence(1))
+            assert(sequence(1.5)==sequence(2))
+            assert(sequence(1+2^32)==sequence(1))
+            """
+        );
     }
 }

tests/Lua.Tests/RuntimeMetamethodFailureTests.cs

@@ -26,13 +26,13 @@ bool suspend
             {
                 if (suspend)
                     await Task.Yield();
-                throw new LuaRuntimeException(context.State, "branch-review-fault");
+                throw new LuaRuntimeException(context.State, "metamethod-fault");
             }
         );
         state.Environment["value"] = new LuaTable { Metatable = metatable };
         var values = await state.DoStringAsync("return pcall(function() " + source + " end)");
         Assert.That(values[0].Read<bool>(), Is.False);
-        Assert.That(values[1].Read<string>(), Does.Contain("branch-review-fault"));
+        Assert.That(values[1].Read<string>(), Does.Contain("metamethod-fault"));
         Assert.That(state.Stack.Count, Is.Zero);
         Assert.That(state.CallStackFrameCount, Is.Zero);
         Assert.That((await state.DoStringAsync("return 42"))[0].Read<double>(), Is.EqualTo(42));

tests/Lua.Tests/ScannerReviewTests.cs → tests/Lua.Tests/ScannerTokenTests.cs

@@ -4,7 +4,7 @@ namespace Lua.Tests;
 
 [TestFixture(LuaStringMode.Utf16)]
 [TestFixture(LuaStringMode.Bytes)]
-public class ScannerReviewTests(LuaStringMode mode)
+public class ScannerTokenTests(LuaStringMode mode)
 {
     LuaState CreateState() =>
         LuaState.Create(
@@ -44,7 +44,7 @@ string expected
     [TestCase("'\\256'")]
     [TestCase("'\\x0'")]
     [TestCase("'\\xGG'")]
-    public void InvalidQuotedStringsAreStillRejected(string literal)
+    public void InvalidQuotedStringsAreRejected(string literal)
     {
         using var state = CreateState();
         Assert.Throws<LuaCompileException>(() =>
@@ -109,7 +109,7 @@ public void MalformedNumeralsMatchLua52TokenBoundaries(string expression, string
     [TestCase("0X.8P+2", 2)]
     [TestCase("000001.25", 1.25)]
     [TestCase("0x1p18446744073709551616", 1)]
-    public async Task ValidNumeralBoundariesAndExponentsStillWork(
+    public async Task ValidNumeralBoundariesAndExponentsAreAccepted(
         string expression,
         double expected
     )

tests/Lua.Tests/TableHelperReviewTests.cs → tests/Lua.Tests/TableLibraryTests.cs

@@ -6,7 +6,7 @@ namespace Lua.Tests;
 
 [TestFixture(LuaStringMode.Utf16)]
 [TestFixture(LuaStringMode.Bytes)]
-public class TableHelperReviewTests(LuaStringMode mode)
+public class TableLibraryTests(LuaStringMode mode)
 {
     LuaState CreateState()
     {
@@ -21,7 +21,7 @@ LuaState CreateState()
     [TestCase("table.remove(t,0.5)")]
     [TestCase("table.insert(t,0/0,99)")]
     [TestCase("table.remove(t,math.huge)")]
-    public async Task InvalidPositionsAreStillRejected(string operation)
+    public async Task InvalidPositionsAreRejected(string operation)
     {
         using var state = CreateState();
         var result = await state.DoStringAsync(
@@ -105,14 +105,4 @@ public async Task ExcessiveUnpackRangesAreRejectedWithoutStackGrowth(string rang
         Assert.That(state.Stack.Count, Is.Zero);
         Assert.That((await state.DoStringAsync("return 42"))[0].Read<double>(), Is.EqualTo(42));
     }
-
-    [Test]
-    public void EmptyStackCanGrowAndRejectsOverflowingCapacity()
-    {
-        var stack = new LuaStack(0);
-        stack.Push(42);
-        Assert.That(stack.Pop().Read<double>(), Is.EqualTo(42));
-        Assert.Throws<LuaStackOverflowException>(() => stack.EnsureCapacity(int.MaxValue));
-        Assert.That(stack.Count, Is.Zero);
-    }
 }

tests/Lua.Tests/VirtualMachineReviewTests.cs → tests/Lua.Tests/VirtualMachineExecutionTests.cs

@@ -5,7 +5,7 @@ namespace Lua.Tests;
 
 [TestFixture(LuaStringMode.Utf16)]
 [TestFixture(LuaStringMode.Bytes)]
-public class VirtualMachineReviewTests(LuaStringMode stringMode)
+public class VirtualMachineExecutionTests(LuaStringMode stringMode)
 {
     LuaState CreateState()
     {