From 991aac291fe40fb995256c89500bbe4b7d68e609 Mon Sep 17 00:00:00 2001
From: Jhett Black <10942655+jhett12321@users.noreply.github.com>
Date: Wed, 4 Dec 2024 23:51:58 +0100
Subject: [PATCH] Additional VM tests.

---
 .../src/main/Constants/VMFunctions.cs         |  9 ++++
 NWNX.NET.Tests/src/main/Tests/VMTests.cs      | 47 ++++++++++++++++++-
 2 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 NWNX.NET.Tests/src/main/Constants/VMFunctions.cs

diff --git a/NWNX.NET.Tests/src/main/Constants/VMFunctions.cs b/NWNX.NET.Tests/src/main/Constants/VMFunctions.cs
new file mode 100644
index 0000000..34f6cfc
--- /dev/null
+++ b/NWNX.NET.Tests/src/main/Constants/VMFunctions.cs
@@ -0,0 +1,9 @@
+namespace NWNX.NET.Tests.Constants;
+
+public static class VMFunctions
+{
+  public const int SubString = 65;
+  public const int fabs = 67;
+  public const int abs = 77;
+  public const int GetModuleName = 561;
+}
diff --git a/NWNX.NET.Tests/src/main/Tests/VMTests.cs b/NWNX.NET.Tests/src/main/Tests/VMTests.cs
index 55212b5..cda625b 100644
--- a/NWNX.NET.Tests/src/main/Tests/VMTests.cs
+++ b/NWNX.NET.Tests/src/main/Tests/VMTests.cs
@@ -1,4 +1,5 @@
 using NUnit.Framework;
+using NWNX.NET.Tests.Constants;
 
 namespace NWNX.NET.Tests
 {
@@ -8,10 +9,54 @@ public sealed class VMTests
     [Test]
     public void GetModuleNameTest()
     {
-      NWNXAPI.CallBuiltIn(561);
+      NWNXAPI.CallBuiltIn(VMFunctions.GetModuleName);
       string? modName = NWNXAPI.StackPopString();
 
       Assert.That(modName, Is.EqualTo("demo"));
     }
+
+    [Test]
+    [TestCase(1, 1)]
+    [TestCase(0, 0)]
+    [TestCase(-1, 1)]
+    [TestCase(-int.MaxValue, int.MaxValue)]
+    public void AbsTest(int value, int expectedValue)
+    {
+      NWNXAPI.StackPushInteger(value);
+      NWNXAPI.CallBuiltIn(VMFunctions.abs);
+      int result = NWNXAPI.StackPopInteger();
+
+      Assert.That(result, Is.EqualTo(expectedValue));
+    }
+
+    [Test]
+    [TestCase(1f, 1f)]
+    [TestCase(0f, 0f)]
+    [TestCase(-1f, 1f)]
+    [TestCase(-float.MaxValue, float.MaxValue)]
+    public void FAbsTest(float value, float expectedValue)
+    {
+      NWNXAPI.StackPushFloat(value);
+      NWNXAPI.CallBuiltIn(VMFunctions.fabs);
+      float result = NWNXAPI.StackPopFloat();
+
+      Assert.That(result, Is.EqualTo(expectedValue));
+    }
+
+    [Test]
+    [TestCase("example_string", 0, 7, "example")]
+    [TestCase("test_string", 5, 6, "string")]
+    [TestCase("", 0, 0, "")]
+    [TestCase(null, 0, 5, "")]
+    public void SubStringTest(string str, int start, int count, string expectedValue)
+    {
+      NWNXAPI.StackPushInteger(count);
+      NWNXAPI.StackPushInteger(start);
+      NWNXAPI.StackPushString(str);
+      NWNXAPI.CallBuiltIn(VMFunctions.SubString);
+
+      string? result = NWNXAPI.StackPopString();
+      Assert.That(result, Is.EqualTo(expectedValue));
+    }
   }
 }