Add unit tests for RemoveStars and ComplexNumber Multiply

Author: SYEDMDSAAD

src/test/java/com/thealgorithms/strings/ComplexNumberMultiplyTest.java

@@ -0,0 +1,23 @@
+package com.thealgorithms.strings;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class ComplexNumberMultiplyTest {
+
+    @Test
+    void testExample() {
+        assertEquals("0+2i", ComplexNumberMultiply.multiply("1+1i", "1+1i"));
+    }
+
+    @Test
+    void testNegative() {
+        assertEquals("0+-2i", ComplexNumberMultiply.multiply("1+-1i", "1+-1i"));
+    }
+
+    @Test
+    void testZero() {
+        assertEquals("0+0i", ComplexNumberMultiply.multiply("0+0i", "5+3i"));
+    }
+}

src/test/java/com/thealgorithms/strings/RemoveStarsTest.java

@@ -0,0 +1,28 @@
+package com.thealgorithms.strings;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class RemoveStarsTest {
+
+    @Test
+    void testExampleCase() {
+        assertEquals("lecoe", RemoveStars.removeStars("leet**cod*e"));
+    }
+
+    @Test
+    void testAllStars() {
+        assertEquals("", RemoveStars.removeStars("abc***"));
+    }
+
+    @Test
+    void testNoStars() {
+        assertEquals("hello", RemoveStars.removeStars("hello"));
+    }
+
+    @Test
+    void testSingleCharacter() {
+        assertEquals("", RemoveStars.removeStars("a*"));
+    }
+}