diff --git a/tests/TrueSkill/TruncatedGaussianCorrectionFunctionsTest.php b/tests/TrueSkill/TruncatedGaussianCorrectionFunctionsTest.php
new file mode 100644
index 0000000..7a82775
--- /dev/null
+++ b/tests/TrueSkill/TruncatedGaussianCorrectionFunctionsTest.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DNW\Skills\Tests\TrueSkill;
+
+use DNW\Skills\TrueSkill\TruncatedGaussianCorrectionFunctions;
+use DNW\Skills\Numerics\BasicMath;
+use DNW\Skills\Numerics\GaussianDistribution;
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+
+#[CoversClass(TruncatedGaussianCorrectionFunctions::class)]
+#[UsesClass(BasicMath::class)]
+#[UsesClass(GaussianDistribution::class)]
+class TruncatedGaussianCorrectionFunctionsTest extends TestCase
+{
+    
+
+    public function testVGreaterThan(): void {
+        // Test values taken from Ralf Herbrich's F# TrueSkill implementation
+        $want = 0.4181660649773850;
+        $tVar = 0.7495591915280050;
+        $eps = 0.0631282276750071;
+        $this->assertEqualsWithDelta($want, TruncatedGaussianCorrectionFunctions::vExceedsMargin($tVar, $eps), 1e-6);
+    }
+    
+    public function testWGreaterThan(): void {
+        // Test values taken from Ralf Herbrich's F# TrueSkill implementation
+        $want = 0.4619049929317120;
+        $tVar = 0.7495591915280050;
+        $eps = 0.0631282276750071;
+        $this->assertEqualsWithDelta($want, TruncatedGaussianCorrectionFunctions::wExceedsMargin($tVar, $eps), 1e-6);
+    }
+    
+    public function testVWithin(): void {
+        // Test values taken from Ralf Herbrich's F# TrueSkill implementation
+        $want = -0.7485644072749330;
+        $tVar = 0.7495591915280050;
+        $eps = 0.0631282276750071;
+        $this->assertEqualsWithDelta($want, TruncatedGaussianCorrectionFunctions::vWithinMargin($tVar, $eps), 1e-6);
+    }
+    
+    public function testWWithin(): void {
+        // Test values taken from Ralf Herbrich's F# TrueSkill implementation
+        $want = 0.9986734210033660;
+        $tVar = 0.7495591915280050;
+        $eps = 0.0631282276750071;
+        $this->assertEqualsWithDelta($want, TruncatedGaussianCorrectionFunctions::wWithinMargin($tVar, $eps), 1e-6);   
+    }
+}