diff --git a/src/test/java/com/thealgorithms/maths/GCDTest.java b/src/test/java/com/thealgorithms/maths/GCDTest.java
new file mode 100644
index 000000000000..3f4d9393465d
--- /dev/null
+++ b/src/test/java/com/thealgorithms/maths/GCDTest.java
@@ -0,0 +1,41 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class GCDTest {
+    @Test
+    void test1() {
+        Assertions.assertThrows(ArithmeticException.class, () -> GCD.gcd(-1,0));
+    }
+
+    @Test
+    void test2() {
+        Assertions.assertThrows(ArithmeticException.class, () -> GCD.gcd(10, -2));
+    }
+
+    @Test
+    void test3() {
+        Assertions.assertThrows(ArithmeticException.class, () -> GCD.gcd(-5, -3));
+    }
+
+    @Test
+    void test4() {
+        Assertions.assertEquals(GCD.gcd(0, 2), 2);
+    }
+
+    @Test
+    void test5() {
+        Assertions.assertEquals(GCD.gcd(10, 0), 10);
+    }
+
+    @Test
+    void test6() {
+        Assertions.assertEquals(GCD.gcd(1, 0), 1);
+    }
+
+    @Test
+    void test7() {
+        Assertions.assertEquals(GCD.gcd(9, 6), 3);
+    }
+}
diff --git a/src/test/java/com/thealgorithms/maths/PrimeCheckTest.java b/src/test/java/com/thealgorithms/maths/PrimeCheckTest.java
new file mode 100644
index 000000000000..59fe78525346
--- /dev/null
+++ b/src/test/java/com/thealgorithms/maths/PrimeCheckTest.java
@@ -0,0 +1,41 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class PrimeCheckTest {
+    @Test
+    void test1() {
+        Assertions.assertTrue(PrimeCheck.isPrime(2));
+    }
+
+    @Test
+    void test2() {
+        Assertions.assertFalse(PrimeCheck.isPrime(-1));
+    }
+
+    @Test
+    void test3() {
+        Assertions.assertFalse(PrimeCheck.isPrime(4));
+    }
+
+    @Test
+    void test4() {
+        Assertions.assertTrue(PrimeCheck.isPrime(5));
+    }
+
+    @Test
+    void test5() {
+        Assertions.assertFalse(PrimeCheck.isPrime(15));
+    }
+
+    @Test
+    void test6() {
+        Assertions.assertTrue(PrimeCheck.isPrime(11));
+    }
+
+    @Test
+    void test7() {
+        Assertions.assertFalse(PrimeCheck.isPrime(49));
+    }
+}