diff --git a/src/test/java/com/thealgorithms/sorts/AdaptiveMergeSortTest.java b/src/test/java/com/thealgorithms/sorts/AdaptiveMergeSortTest.java
index 9d94b165d81b..c43aad7989eb 100644
--- a/src/test/java/com/thealgorithms/sorts/AdaptiveMergeSortTest.java
+++ b/src/test/java/com/thealgorithms/sorts/AdaptiveMergeSortTest.java
@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 
+import java.util.Objects;
 import org.junit.jupiter.api.Test;
 
 public class AdaptiveMergeSortTest {
@@ -50,4 +51,89 @@ public void testSortSingleElement() {
         Integer[] result = adaptiveMergeSort.sort(input);
         assertArrayEquals(expected, result);
     }
+
+    @Test
+    public void testSortAlreadySortedArray() {
+        AdaptiveMergeSort adaptiveMergeSort = new AdaptiveMergeSort();
+        Integer[] inputArray = {-12, -6, -3, 0, 2, 2, 13, 46};
+        Integer[] outputArray = adaptiveMergeSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void testSortReversedSortedArray() {
+        AdaptiveMergeSort adaptiveMergeSort = new AdaptiveMergeSort();
+        Integer[] inputArray = {46, 13, 2, 2, 0, -3, -6, -12};
+        Integer[] outputArray = adaptiveMergeSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void testSortAllEqualArray() {
+        AdaptiveMergeSort adaptiveMergeSort = new AdaptiveMergeSort();
+        Integer[] inputArray = {2, 2, 2, 2, 2};
+        Integer[] outputArray = adaptiveMergeSort.sort(inputArray);
+        Integer[] expectedOutput = {2, 2, 2, 2, 2};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void testSortMixedCaseStrings() {
+        AdaptiveMergeSort adaptiveMergeSort = new AdaptiveMergeSort();
+        String[] inputArray = {"banana", "Apple", "apple", "Banana"};
+        String[] expectedOutput = {"Apple", "Banana", "apple", "banana"};
+        String[] outputArray = adaptiveMergeSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
+
+    /**
+     * Custom Comparable class for testing.
+     **/
+    static class Person implements Comparable<Person> {
+        String name;
+        int age;
+
+        Person(String name, int age) {
+            this.name = name;
+            this.age = age;
+        }
+
+        @Override
+        public int compareTo(Person o) {
+            return Integer.compare(this.age, o.age);
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (!(o instanceof Person)) {
+                return false;
+            }
+            Person p = (Person) o;
+            return this.name.equals(p.name) && this.age == p.age;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(name, age);
+        }
+    }
+
+    @Test
+    public void testSortCustomObjects() {
+        AdaptiveMergeSort adaptiveMergeSort = new AdaptiveMergeSort();
+        Person[] inputArray = {
+            new Person("Alice", 32),
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+        };
+        Person[] expectedOutput = {
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+            new Person("Alice", 32),
+        };
+        Person[] outputArray = adaptiveMergeSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
 }
diff --git a/src/test/java/com/thealgorithms/sorts/BogoSortTest.java b/src/test/java/com/thealgorithms/sorts/BogoSortTest.java
index 3ebfb7a305b0..7fcf51396615 100644
--- a/src/test/java/com/thealgorithms/sorts/BogoSortTest.java
+++ b/src/test/java/com/thealgorithms/sorts/BogoSortTest.java
@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 
+import java.util.Objects;
 import org.junit.jupiter.api.Test;
 
 public class BogoSortTest {
@@ -63,4 +64,84 @@ public void bogoSortDuplicateStringArray() {
         String[] expectedOutput = {"a", "b", "b", "c", "d", "d", "h", "s"};
         assertArrayEquals(outputArray, expectedOutput);
     }
+
+    @Test
+    public void bogoSortAlreadySortedArray() {
+        Integer[] inputArray = {-12, -6, -3, 0, 2, 2, 13, 46};
+        Integer[] outputArray = bogoSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void bogoSortReversedSortedArray() {
+        Integer[] inputArray = {46, 13, 2, 2, 0, -3, -6, -12};
+        Integer[] outputArray = bogoSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void bogoSortAllEqualArray() {
+        Integer[] inputArray = {2, 2, 2, 2, 2};
+        Integer[] outputArray = bogoSort.sort(inputArray);
+        Integer[] expectedOutput = {2, 2, 2, 2, 2};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void bogoSortMixedCaseStrings() {
+        String[] inputArray = {"banana", "Apple", "apple", "Banana"};
+        String[] expectedOutput = {"Apple", "Banana", "apple", "banana"};
+        String[] outputArray = bogoSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
+
+    /**
+     * Custom Comparable class for testing.
+     **/
+    static class Person implements Comparable<Person> {
+        String name;
+        int age;
+
+        Person(String name, int age) {
+            this.name = name;
+            this.age = age;
+        }
+
+        @Override
+        public int compareTo(Person o) {
+            return Integer.compare(this.age, o.age);
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (!(o instanceof Person)) {
+                return false;
+            }
+            Person p = (Person) o;
+            return this.name.equals(p.name) && this.age == p.age;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(name, age);
+        }
+    }
+
+    @Test
+    public void bogoSortCustomObjects() {
+        Person[] inputArray = {
+            new Person("Alice", 32),
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+        };
+        Person[] expectedOutput = {
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+            new Person("Alice", 32),
+        };
+        Person[] outputArray = bogoSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
 }
diff --git a/src/test/java/com/thealgorithms/sorts/BubbleSortTest.java b/src/test/java/com/thealgorithms/sorts/BubbleSortTest.java
index 8690a3f5435c..ce426cd35b05 100644
--- a/src/test/java/com/thealgorithms/sorts/BubbleSortTest.java
+++ b/src/test/java/com/thealgorithms/sorts/BubbleSortTest.java
@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 
+import java.util.Objects;
 import org.junit.jupiter.api.Test;
 
 /**
@@ -91,4 +92,84 @@ public void bubbleSortStringArray() {
         };
         assertArrayEquals(outputArray, expectedOutput);
     }
+
+    @Test
+    public void bubbleSortAlreadySortedArray() {
+        Integer[] inputArray = {-12, -6, -3, 0, 2, 2, 13, 46};
+        Integer[] outputArray = bubbleSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void bubbleSortReversedSortedArray() {
+        Integer[] inputArray = {46, 13, 2, 2, 0, -3, -6, -12};
+        Integer[] outputArray = bubbleSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void bubbleSortAllEqualArray() {
+        Integer[] inputArray = {2, 2, 2, 2, 2};
+        Integer[] outputArray = bubbleSort.sort(inputArray);
+        Integer[] expectedOutput = {2, 2, 2, 2, 2};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void bubbleSortMixedCaseStrings() {
+        String[] inputArray = {"banana", "Apple", "apple", "Banana"};
+        String[] expectedOutput = {"Apple", "Banana", "apple", "banana"};
+        String[] outputArray = bubbleSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
+
+    /**
+     * Custom Comparable class for testing.
+     **/
+    static class Person implements Comparable<Person> {
+        String name;
+        int age;
+
+        Person(String name, int age) {
+            this.name = name;
+            this.age = age;
+        }
+
+        @Override
+        public int compareTo(Person o) {
+            return Integer.compare(this.age, o.age);
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (!(o instanceof Person)) {
+                return false;
+            }
+            Person p = (Person) o;
+            return this.name.equals(p.name) && this.age == p.age;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(name, age);
+        }
+    }
+
+    @Test
+    public void bubbleSortCustomObjects() {
+        Person[] inputArray = {
+            new Person("Alice", 32),
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+        };
+        Person[] expectedOutput = {
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+            new Person("Alice", 32),
+        };
+        Person[] outputArray = bubbleSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
 }
diff --git a/src/test/java/com/thealgorithms/sorts/GnomeSortTest.java b/src/test/java/com/thealgorithms/sorts/GnomeSortTest.java
index d86546472580..a4ca5c981ade 100644
--- a/src/test/java/com/thealgorithms/sorts/GnomeSortTest.java
+++ b/src/test/java/com/thealgorithms/sorts/GnomeSortTest.java
@@ -1,7 +1,9 @@
 package com.thealgorithms.sorts;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 
+import java.util.Objects;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
@@ -79,4 +81,89 @@ public void gnomeSortDuplicateStringArray() {
         gnomeSort.sort(inputArray);
         assertThat(inputArray).isEqualTo(expectedOutput);
     }
+
+    @Test
+    @DisplayName("GnomeSort for sorted Array")
+    public void testSortAlreadySortedArray() {
+        Integer[] inputArray = {-12, -6, -3, 0, 2, 2, 13, 46};
+        Integer[] outputArray = gnomeSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    @DisplayName("GnomeSort for reversed sorted Array")
+    public void testSortReversedSortedArray() {
+        Integer[] inputArray = {46, 13, 2, 2, 0, -3, -6, -12};
+        Integer[] outputArray = gnomeSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    @DisplayName("GnomeSort for All equal Array")
+    public void testSortAllEqualArray() {
+        Integer[] inputArray = {2, 2, 2, 2, 2};
+        Integer[] outputArray = gnomeSort.sort(inputArray);
+        Integer[] expectedOutput = {2, 2, 2, 2, 2};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    @DisplayName("GnomeSort String Array with mixed cases")
+    public void testSortMixedCaseStrings() {
+        String[] inputArray = {"banana", "Apple", "apple", "Banana"};
+        String[] expectedOutput = {"Apple", "Banana", "apple", "banana"};
+        String[] outputArray = gnomeSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
+
+    /**
+     * Custom Comparable class for testing.
+     **/
+    static class Person implements Comparable<Person> {
+        String name;
+        int age;
+
+        Person(String name, int age) {
+            this.name = name;
+            this.age = age;
+        }
+
+        @Override
+        public int compareTo(Person o) {
+            return Integer.compare(this.age, o.age);
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (!(o instanceof Person)) {
+                return false;
+            }
+            Person p = (Person) o;
+            return this.name.equals(p.name) && this.age == p.age;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(name, age);
+        }
+    }
+
+    @Test
+    @DisplayName("GnomeSort Custom Object Array")
+    public void testSortCustomObjects() {
+        Person[] inputArray = {
+            new Person("Alice", 32),
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+        };
+        Person[] expectedOutput = {
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+            new Person("Alice", 32),
+        };
+        Person[] outputArray = gnomeSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
 }
diff --git a/src/test/java/com/thealgorithms/sorts/InsertionSortTest.java b/src/test/java/com/thealgorithms/sorts/InsertionSortTest.java
index 78744973355d..2b423ce9f8ae 100644
--- a/src/test/java/com/thealgorithms/sorts/InsertionSortTest.java
+++ b/src/test/java/com/thealgorithms/sorts/InsertionSortTest.java
@@ -3,6 +3,7 @@
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.util.Objects;
 import java.util.function.Function;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -111,4 +112,84 @@ private void testWithRandomArray(Function<Double[], Double[]> sortAlgorithm) {
         Double[] sorted = sortAlgorithm.apply(array);
         assertTrue(SortUtils.isSorted(sorted));
     }
+
+    @Test
+    public void testSortAlreadySortedArray() {
+        Integer[] inputArray = {-12, -6, -3, 0, 2, 2, 13, 46};
+        Integer[] outputArray = insertionSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void testSortReversedSortedArray() {
+        Integer[] inputArray = {46, 13, 2, 2, 0, -3, -6, -12};
+        Integer[] outputArray = insertionSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void testSortAllEqualArray() {
+        Integer[] inputArray = {2, 2, 2, 2, 2};
+        Integer[] outputArray = insertionSort.sort(inputArray);
+        Integer[] expectedOutput = {2, 2, 2, 2, 2};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void testSortMixedCaseStrings() {
+        String[] inputArray = {"banana", "Apple", "apple", "Banana"};
+        String[] expectedOutput = {"Apple", "Banana", "apple", "banana"};
+        String[] outputArray = insertionSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
+
+    /**
+     * Custom Comparable class for testing.
+     **/
+    static class Person implements Comparable<Person> {
+        String name;
+        int age;
+
+        Person(String name, int age) {
+            this.name = name;
+            this.age = age;
+        }
+
+        @Override
+        public int compareTo(Person o) {
+            return Integer.compare(this.age, o.age);
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (!(o instanceof Person)) {
+                return false;
+            }
+            Person p = (Person) o;
+            return this.name.equals(p.name) && this.age == p.age;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(name, age);
+        }
+    }
+
+    @Test
+    public void testSortCustomObjects() {
+        Person[] inputArray = {
+            new Person("Alice", 32),
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+        };
+        Person[] expectedOutput = {
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+            new Person("Alice", 32),
+        };
+        Person[] outputArray = insertionSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
 }
diff --git a/src/test/java/com/thealgorithms/sorts/SlowSortTest.java b/src/test/java/com/thealgorithms/sorts/SlowSortTest.java
index d4d9eaa1c275..e38bab90c9be 100644
--- a/src/test/java/com/thealgorithms/sorts/SlowSortTest.java
+++ b/src/test/java/com/thealgorithms/sorts/SlowSortTest.java
@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 
+import java.util.Objects;
 import org.junit.jupiter.api.Test;
 
 /**
@@ -76,4 +77,84 @@ public void slowSortStringSymbolArray() {
         String[] expectedOutput = {"(a", "(b", ")", "a", "au", "auk", "auk", "bhy", "cba", "cba", "cbf", "á", "ó"};
         assertArrayEquals(outputArray, expectedOutput);
     }
+
+    @Test
+    public void testSortAlreadySortedArray() {
+        Integer[] inputArray = {-12, -6, -3, 0, 2, 2, 13, 46};
+        Integer[] outputArray = slowSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void testSortReversedSortedArray() {
+        Integer[] inputArray = {46, 13, 2, 2, 0, -3, -6, -12};
+        Integer[] outputArray = slowSort.sort(inputArray);
+        Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void testSortAllEqualArray() {
+        Integer[] inputArray = {2, 2, 2, 2, 2};
+        Integer[] outputArray = slowSort.sort(inputArray);
+        Integer[] expectedOutput = {2, 2, 2, 2, 2};
+        assertArrayEquals(outputArray, expectedOutput);
+    }
+
+    @Test
+    public void testSortMixedCaseStrings() {
+        String[] inputArray = {"banana", "Apple", "apple", "Banana"};
+        String[] expectedOutput = {"Apple", "Banana", "apple", "banana"};
+        String[] outputArray = slowSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
+
+    /**
+     * Custom Comparable class for testing.
+     **/
+    static class Person implements Comparable<Person> {
+        String name;
+        int age;
+
+        Person(String name, int age) {
+            this.name = name;
+            this.age = age;
+        }
+
+        @Override
+        public int compareTo(Person o) {
+            return Integer.compare(this.age, o.age);
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (!(o instanceof Person)) {
+                return false;
+            }
+            Person p = (Person) o;
+            return this.name.equals(p.name) && this.age == p.age;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(name, age);
+        }
+    }
+
+    @Test
+    public void testSortCustomObjects() {
+        Person[] inputArray = {
+            new Person("Alice", 32),
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+        };
+        Person[] expectedOutput = {
+            new Person("Bob", 25),
+            new Person("Charlie", 28),
+            new Person("Alice", 32),
+        };
+        Person[] outputArray = slowSort.sort(inputArray);
+        assertArrayEquals(expectedOutput, outputArray);
+    }
 }