[BAEL-3348] Moved code to algorithm-4

java-numbers/src/test/java/com/baeldung/maths/MathSinUnitTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.maths;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+public class MathSinUnitTest {
+
+    @Test
+    public void givenAnAngleInDegrees_whenUsingToRadians_thenResultIsInRadians() {
+        double angleInDegrees = 30;
+        double sinForDegrees = Math.sin(Math.toRadians(angleInDegrees)); // 0.5
+
+        double thirtyDegreesInRadians = (double) 1 / 6 * Math.PI;
+        double sinForRadians = Math.sin(thirtyDegreesInRadians); // 0.5
+
+        assertThat(sinForDegrees, is(sinForRadians));
+    }
+
+}