[orx-math] Add complex number implementation and associated test cases

orx-math/src/commonTest/kotlin/complex/ComplexSinhTest.kt

@@ -0,0 +1,51 @@
+package org.openrndr.extra.math.complex
+
+import kotlin.math.PI
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class ComplexSinhTest {
+    
+    @Test
+    fun testSinhOfZero() {
+        val z = Complex(0.0, 0.0)
+        val result = sinh(z)
+        assertEquals(0.0, result.real, 1e-10)
+        assertEquals(0.0, result.imaginary, 1e-10)
+    }
+    
+    @Test
+    fun testSinhOfOne() {
+        val z = Complex(1.0, 0.0)
+        val result = sinh(z)
+        assertEquals(kotlin.math.sinh(1.0), result.real, 1e-10)
+        assertEquals(0.0, result.imaginary, 1e-10)
+    }
+    
+    @Test
+    fun testSinhOfImaginaryUnit() {
+        val z = Complex(0.0, 1.0)
+        val result = sinh(z)
+        assertEquals(0.0, result.real, 1e-10)
+        assertEquals(kotlin.math.sin(1.0), result.imaginary, 1e-10)
+    }
+    
+    @Test
+    fun testSinhOfImaginaryPi() {
+        val z = Complex(0.0, PI)
+        val result = sinh(z)
+        assertEquals(0.0, result.real, 1e-10)
+        assertEquals(kotlin.math.sin(PI), result.imaginary, 1e-10)
+    }
+    
+    @Test
+    fun testSinhOfComplexNumber() {
+        val z = Complex(1.0, 1.0)
+        val result = sinh(z)
+        // Expected values calculated using the formula: sinh(1+i) = sinh(1)cos(1) + i·cosh(1)sin(1)
+        val expectedReal = kotlin.math.sinh(1.0) * kotlin.math.cos(1.0)
+        val expectedImaginary = kotlin.math.cosh(1.0) * kotlin.math.sin(1.0)
+        assertEquals(expectedReal, result.real, 1e-10)
+        assertEquals(expectedImaginary, result.imaginary, 1e-10)
+    }
+}