assert that positive

core-java-modules/core-java-numbers-7/src/test/java/com/baeldung/securerandompositivelong/SecureRandomPositiveLongUnitTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.securerandompositivelong;
+
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+import java.security.SecureRandom;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class SecureRandomPositiveLongUnitTest {
+
+    @Test
+    void whenGenerateRecureRandom_thenGetExpectedValue() {
+        SecureRandom secureRandom = new SecureRandom();
+        long randomPositiveLong = Math.abs(secureRandom.nextLong());
+
+        assertThat(randomPositiveLong).isPositive();
+
+        Double pc = 1.0 / Math.pow(2, 63);
+        System.out.printf("%.40f", pc);
+
+        assertThat(pc).isLessThan(0.00000000000000001);
+    }
+}