diff --git a/Sprint-3/1-key-implement/1-get-angle-type.js b/Sprint-3/1-key-implement/1-get-angle-type.js
index 08d1f0cba..ca82810fc 100644
--- a/Sprint-3/1-key-implement/1-get-angle-type.js
+++ b/Sprint-3/1-key-implement/1-get-angle-type.js
@@ -8,8 +8,12 @@
 // Then, write the next test! :) Go through this process until all the cases are implemented
 
 function getAngleType(angle) {
-   if (angle === 90) return "Right angle";
-   // read to the end, complete line 36, then pass your test here
+  if (angle === 90) return "Right angle";
+  else if (angle > 0 && angle < 90) return "Acute angle";
+  else if (angle > 90 && angle < 180) return "Obtuse angle";
+  else if (angle === 180) return "Straight line";
+  else if (angle > 180 && angle < 360) return "Reflex angle";
+  // read to the end, complete line 36, then pass your test here
 }
 
 // we're going to use this helper function to make our assertions easier to read
@@ -43,14 +47,16 @@ assertEquals(acute, "Acute angle");
 // When the angle is greater than 90 degrees and less than 180 degrees,
 // Then the function should return "Obtuse angle"
 const obtuse = getAngleType(120);
-// ====> write your test here, and then add a line to pass the test in the function above
+assertEquals(obtuse, "Obtuse angle");
 
 // Case 4: Identify Straight Angles:
 // When the angle is exactly 180 degrees,
 // Then the function should return "Straight angle"
-// ====> write your test here, and then add a line to pass the test in the function above
+const line = getAngleType(180);
+assertEquals(line, "Straight line");
 
 // Case 5: Identify Reflex Angles:
 // When the angle is greater than 180 degrees and less than 360 degrees,
 // Then the function should return "Reflex angle"
-// ====> write your test here, and then add a line to pass the test in the function above
\ No newline at end of file
+const reflex = getAngleType(210);
+assertEquals(reflex, "Reflex angle");
diff --git a/Sprint-3/1-key-implement/2-is-proper-fraction.js b/Sprint-3/1-key-implement/2-is-proper-fraction.js
index 91583e941..36e5ec50f 100644
--- a/Sprint-3/1-key-implement/2-is-proper-fraction.js
+++ b/Sprint-3/1-key-implement/2-is-proper-fraction.js
@@ -8,7 +8,8 @@
 // write one test at a time, and make it pass, build your solution up methodically
 
 function isProperFraction(numerator, denominator) {
-    if (numerator < denominator) return true;
+  if (Math.abs(numerator) < denominator) return true;
+  else return false;
 }
 
 // here's our helper again
@@ -40,14 +41,20 @@ assertEquals(improperFraction, false);
 // target output: true
 // Explanation: The fraction -4/7 is a proper fraction because the absolute value of the numerator (4) is less than the denominator (7). The function should return true.
 const negativeFraction = isProperFraction(-4, 7);
-// ====> complete with your assertion
+assertEquals(negativeFraction, true);
 
 // Equal Numerator and Denominator check:
 // Input: numerator = 3, denominator = 3
 // target output: false
 // Explanation: The fraction 3/3 is not a proper fraction because the numerator is equal to the denominator. The function should return false.
 const equalFraction = isProperFraction(3, 3);
-// ====> complete with your assertion
+assertEquals(equalFraction, false);
 
 // Stretch:
 // What other scenarios could you test for?
+// Negative Fraction check where numerator is greater than denominator
+// Input: numerator = -8, denominator = 5
+// target output: false
+// Explanation: The fraction -8/5 is a improper fraction because the absolute value of the numerator (8) is greater than the denominator (7). The function should return false.
+const negativeImproper = isProperFraction(-8, 7);
+assertEquals(negativeImproper, false);
diff --git a/Sprint-3/1-key-implement/3-get-card-value.js b/Sprint-3/1-key-implement/3-get-card-value.js
index aa1cc9f90..6ea3b2a9b 100644
--- a/Sprint-3/1-key-implement/3-get-card-value.js
+++ b/Sprint-3/1-key-implement/3-get-card-value.js
@@ -8,7 +8,12 @@
 // write one test at a time, and make it pass, build your solution up methodically
 // just make one change at a time -- don't rush -- programmers are deep and careful thinkers
 function getCardValue(card) {
-    if (rank === "A") return 11;
+  let rank = card.startsWith("10") ? "10" : card[0];
+  if (rank === "A") return 11;
+  else if (rank >= "2" && rank <= "9") return Number(rank);
+  else if (rank === "10" || rank === "J" || rank === "Q" || rank === "K")
+    return 10;
+  else return "Invalid Card rank";
 }
 
 // You need to write assertions for your function to check it works in different cases
@@ -25,27 +30,31 @@ function assertEquals(actualOutput, targetOutput) {
 // Given a card string in the format "A♠" (representing a card in blackjack - the last character will always be an emoji for a suit, and all characters before will be a number 2-10, or one letter of J, Q, K, A),
 // When the function getCardValue is called with this card string as input,
 // Then it should return the numerical card value
-const aceofSpades = getCardValue("A♠");
-assertEquals(aceofSpades, 11);
 
 // Handle Number Cards (2-10):
 // Given a card with a rank between "2" and "9",
 // When the function is called with such a card,
 // Then it should return the numeric value corresponding to the rank (e.g., "5" should return 5).
 const fiveofHearts = getCardValue("5♥");
-// ====> write your test here, and then add a line to pass the test in the function above
+assertEquals(fiveofHearts, 5);
 
 // Handle Face Cards (J, Q, K):
 // Given a card with a rank of "10," "J," "Q," or "K",
 // When the function is called with such a card,
 // Then it should return the value 10, as these cards are worth 10 points each in blackjack.
+const faceCards = getCardValue("10♣");
+assertEquals(faceCards, 10);
 
 // Handle Ace (A):
 // Given a card with a rank of "A",
 // When the function is called with an Ace,
 // Then it should, by default, assume the Ace is worth 11 points, which is a common rule in blackjack.
+const aceofSpades = getCardValue("A♠");
+assertEquals(aceofSpades, 11);
 
 // Handle Invalid Cards:
 // Given a card with an invalid rank (neither a number nor a recognized face card),
 // When the function is called with such a card,
 // Then it should throw an error indicating "Invalid card rank."
+const invalidCards = getCardValue("14");
+assertEquals(invalidCards, "Invalid Card rank");
diff --git a/Sprint-3/2-mandatory-rewrite/1-get-angle-type.js b/Sprint-3/2-mandatory-rewrite/1-get-angle-type.js
index d61254bd7..8bdc2d71f 100644
--- a/Sprint-3/2-mandatory-rewrite/1-get-angle-type.js
+++ b/Sprint-3/2-mandatory-rewrite/1-get-angle-type.js
@@ -1,18 +1,14 @@
 function getAngleType(angle) {
   if (angle === 90) return "Right angle";
-  // replace with your completed function from key-implement
-
+  if (angle === 90) return "Right angle";
+  else if (angle > 0 && angle < 90) return "Acute angle";
+  else if (angle > 90 && angle < 180) return "Obtuse angle";
+  else if (angle === 180) return "Straight angle";
+  else if (angle > 180 && angle < 360) return "Reflex angle";
 }
 
-
-
-
-
-
-
-
 // Don't get bogged down in this detail
 // Jest uses CommonJS module syntax by default as it's quite old
-// We will upgrade our approach to ES6 modules in the next course module, so for now 
+// We will upgrade our approach to ES6 modules in the next course module, so for now
 // we have just written the CommonJS module.exports syntax for you
-module.exports = getAngleType;
\ No newline at end of file
+module.exports = getAngleType;
diff --git a/Sprint-3/2-mandatory-rewrite/1-get-angle-type.test.js b/Sprint-3/2-mandatory-rewrite/1-get-angle-type.test.js
index b62827b7c..f5ff47df0 100644
--- a/Sprint-3/2-mandatory-rewrite/1-get-angle-type.test.js
+++ b/Sprint-3/2-mandatory-rewrite/1-get-angle-type.test.js
@@ -4,21 +4,30 @@ test("should identify right angle (90°)", () => {
   expect(getAngleType(90)).toEqual("Right angle");
 });
 
-// REPLACE the comments with the tests
-// make your test descriptions as clear and readable as possible
-
 // Case 2: Identify Acute Angles:
 // When the angle is less than 90 degrees,
 // Then the function should return "Acute angle"
+test("Should identify acute angle (< 90º)", () => {
+  expect(getAngleType(45)).toEqual("Acute angle");
+});
 
 // Case 3: Identify Obtuse Angles:
 // When the angle is greater than 90 degrees and less than 180 degrees,
 // Then the function should return "Obtuse angle"
+test("Should identify obtuse angle (>90 & <180)", () => {
+  expect(getAngleType(120)).toEqual("Obtuse angle");
+});
 
 // Case 4: Identify Straight Angles:
 // When the angle is exactly 180 degrees,
 // Then the function should return "Straight angle"
+test("Should identify straight angles (180º)", () => {
+  expect(getAngleType(180)).toEqual("Straight angle");
+});
 
 // Case 5: Identify Reflex Angles:
 // When the angle is greater than 180 degrees and less than 360 degrees,
 // Then the function should return "Reflex angle"
+test("Should identify reflex angle (>180º & <360º)", () => {
+  expect(getAngleType(220)).toEqual("Reflex angle");
+});
diff --git a/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.js b/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.js
index 9836fe398..109c1ff16 100644
--- a/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.js
+++ b/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.js
@@ -1,6 +1,8 @@
 function isProperFraction(numerator, denominator) {
-    if (numerator < denominator) return true;
-    // add your completed function from key-implement here
+  // add your completed function from key-implement here
+  if (Math.abs(numerator) < denominator) return true;
+  else if (Math.abs(numerator) > denominator) return false;
+  else return false;
 }
 
-module.exports = isProperFraction;
\ No newline at end of file
+module.exports = isProperFraction;
diff --git a/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.test.js b/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.test.js
index ff1cc8173..2bcb9c460 100644
--- a/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.test.js
+++ b/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.test.js
@@ -5,7 +5,16 @@ test("should return true for a proper fraction", () => {
 });
 
 // Case 2: Identify Improper Fractions:
+test("should return false for improper function", () => {
+  expect(isProperFraction(7, 5)).toEqual(false);
+});
 
 // Case 3: Identify Negative Fractions:
+test("should return true for negative proper fractions", () => {
+  expect(isProperFraction(-3, 4)).toEqual(true);
+});
 
 // Case 4: Identify Equal Numerator and Denominator:
+test("should return false for equal Numerator and Denominator", () => {
+  expect(isProperFraction(7, 7)).toEqual(false);
+});
diff --git a/Sprint-3/2-mandatory-rewrite/3-get-card-value.js b/Sprint-3/2-mandatory-rewrite/3-get-card-value.js
index 0d95d3736..44cd3846c 100644
--- a/Sprint-3/2-mandatory-rewrite/3-get-card-value.js
+++ b/Sprint-3/2-mandatory-rewrite/3-get-card-value.js
@@ -1,5 +1,9 @@
 function getCardValue(card) {
-    // replace with your code from key-implement
-    return 11;
+  // replace with your code from key-implement
+  let rank = card[0];
+  if (rank === "A") return 11;
+  else if (rank >= "2" && rank <= "9") return Number(rank);
+  else if (rank == "10" || rank == "J" || rank == "Q" || rank == "K") return 10;
+  else return "Invalid Card rank";
 }
-module.exports = getCardValue;
\ No newline at end of file
+module.exports = getCardValue;
diff --git a/Sprint-3/2-mandatory-rewrite/3-get-card-value.test.js b/Sprint-3/2-mandatory-rewrite/3-get-card-value.test.js
index 03a8e2f34..f90dd976e 100644
--- a/Sprint-3/2-mandatory-rewrite/3-get-card-value.test.js
+++ b/Sprint-3/2-mandatory-rewrite/3-get-card-value.test.js
@@ -1,11 +1,23 @@
 const getCardValue = require("./3-get-card-value");
 
 test("should return 11 for Ace of Spades", () => {
-    const aceofSpades = getCardValue("A♠");
-    expect(aceofSpades).toEqual(11);
-    });
+  const aceofSpades = getCardValue("A♠");
+  expect(aceofSpades).toEqual(11);
+});
 
 // Case 2: Handle Number Cards (2-10):
+test("should return the numeric value corresponding to the rank", () => {
+  expect(getCardValue("2♣︎")).toEqual(2);
+});
 // Case 3: Handle Face Cards (J, Q, K):
+test("should return the value 10, as these cards are worth 10 points each in blackjack", () => {
+  expect(getCardValue("J♠︎")).toEqual(10);
+});
 // Case 4: Handle Ace (A):
+test("should return 11 for Ace", () => {
+  expect(getCardValue("A♦︎")).toEqual(11);
+});
 // Case 5: Handle Invalid Cards:
+test("should return Invalid card rank", () => {
+  expect(getCardValue("11")).toEqual("Invalid Card rank");
+});
diff --git a/Sprint-3/3-mandatory-practice/implement/count.js b/Sprint-3/3-mandatory-practice/implement/count.js
index fce249650..a64ed91ab 100644
--- a/Sprint-3/3-mandatory-practice/implement/count.js
+++ b/Sprint-3/3-mandatory-practice/implement/count.js
@@ -1,5 +1,15 @@
 function countChar(stringOfCharacters, findCharacter) {
-    return 5
+  // Find the number of times findCharacter appears in stringOfCharacters
+
+  let count = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] === findCharacter) {
+      // Increment the count
+      count++;
+    }
+  }
+  // Return the count
+  return count;
 }
 
-module.exports = countChar;
\ No newline at end of file
+module.exports = countChar;
diff --git a/Sprint-3/3-mandatory-practice/implement/count.test.js b/Sprint-3/3-mandatory-practice/implement/count.test.js
index 42baf4b4b..de6d24dec 100644
--- a/Sprint-3/3-mandatory-practice/implement/count.test.js
+++ b/Sprint-3/3-mandatory-practice/implement/count.test.js
@@ -22,3 +22,21 @@ test("should count multiple occurrences of a character", () => {
 // And a character char that does not exist within the case-sensitive str,
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of the char were found in the case-sensitive str.
+test("should return 0 when character does not exist in the string", () => {
+  const str = "hello";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+// Scenario: Case Sensitivity
+// Given the input string str,
+// And a character char that exists in the str with different cases (e.g., 'A' vs. 'a'),
+// When the function is called with these inputs,
+// Then it should return the count of occurrences of case-sensitive char
+test("should count occurrences of a case-sensitive character with different cases", () => {
+  const str = "Hello";
+  const char = "h";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
diff --git a/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.js b/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.js
index 24f528b0d..4fd8c64d7 100644
--- a/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.js
+++ b/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.js
@@ -1,5 +1,23 @@
 function getOrdinalNumber(num) {
- return "1st";
+  let ordinal = "";
+  switch (true) {
+    case num == 1 || (num % 10 == 1 && num != 11):
+      ordinal = `${num}st`;
+      break;
+    case num == 11:
+      ordinal = `${num}th`;
+      break;
+    case num == 2 || num == 22:
+      ordinal = `${num}nd`;
+      break;
+    case num == 3 || (num % 10 == 3 && num != 13):
+      ordinal = `${num}rd`;
+      break;
+    default:
+      ordinal = `${num}th`;
+      break;
+  }
+  return ordinal;
 }
 
-module.exports = getOrdinalNumber;
\ No newline at end of file
+module.exports = getOrdinalNumber;
diff --git a/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.test.js b/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.test.js
index 6d55dfbb4..ec75a830c 100644
--- a/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.test.js
+++ b/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.test.js
@@ -9,5 +9,62 @@ const getOrdinalNumber = require("./get-ordinal-number");
 // Then the function should return "1st"
 
 test("should return '1st' for 1", () => {
-    expect(getOrdinalNumber(1)).toEqual("1st");
-    });
+  expect(getOrdinalNumber(1)).toEqual("1st");
+});
+
+// Case 2: Identify the ordinal number for 11
+// When the number is 11,
+// Then the function should return "11th"
+test("should return '11th' for 11", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+});
+
+// Case 3: Identify the ordinal number for numbers ending with 1
+// When the number is 21,
+// Then the function should return "21st"
+
+test("should return '21st' for 21", () => {
+  expect(getOrdinalNumber(21)).toEqual("21st");
+});
+
+// Case 4: Identify the ordinal number for 2
+// When the number is 2,
+// Then the function should return "2nd"
+test("should return '2nd' for 2", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+});
+
+// Case 5: Identify the ordinal number for 22
+// When the number is 22,
+// Then the function should return "22nd"
+test("should return '22nd' for 22", () => {
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+});
+
+// Case 6: Identify the ordinal number for 3
+// When the number is 3,
+// Then the function should return "3rd"
+test("should return '3rd' for 3", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+});
+
+// Case 7: Identify the ordinal number for numbers ending with 3
+// When the number is 23,
+// Then the function should return "23rd"
+test("should return '23rd' for 23", () => {
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+});
+
+// Case 8: Identify the ordinal number for 13
+// When the number is 13,
+// Then the function should return "13th"
+test("should return '13th' for 13", () => {
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+
+// Case 9: Identify the ordinal number for numbers ending with 4
+// When the number is 4,
+// Then the function should return "4th"
+test("should return '4th' for 4", () => {
+  expect(getOrdinalNumber(24)).toEqual("24th");
+});
diff --git a/Sprint-3/3-mandatory-practice/implement/repeat.js b/Sprint-3/3-mandatory-practice/implement/repeat.js
index 621f9bd35..ace2aa547 100644
--- a/Sprint-3/3-mandatory-practice/implement/repeat.js
+++ b/Sprint-3/3-mandatory-practice/implement/repeat.js
@@ -1,5 +1,13 @@
-function repeat() {
-    return "hellohellohello";
+function repeat(str, count) {
+  let result = "";
+  if (count < 0) {
+    throw new Error("Invalid count");
+  }
+  for (i = 0; i < count; i++) {
+    result += str;
+  }
+  return result;
+  //return str.repeat(count);
 }
 
-module.exports = repeat;
\ No newline at end of file
+module.exports = repeat;
diff --git a/Sprint-3/3-mandatory-practice/implement/repeat.test.js b/Sprint-3/3-mandatory-practice/implement/repeat.test.js
index 8a4ab42ef..9fefb6fbc 100644
--- a/Sprint-3/3-mandatory-practice/implement/repeat.test.js
+++ b/Sprint-3/3-mandatory-practice/implement/repeat.test.js
@@ -10,23 +10,51 @@ const repeat = require("./repeat");
 // Then it should repeat the str count times and return a new string containing the repeated str values.
 
 test("should repeat the string count times", () => {
-    const str = "hello";
-    const count = 3;
-    const repeatedStr = repeat(str, count);
-    expect(repeatedStr).toEqual("hellohellohello");
-    });
+  const str = "hello";
+  const count = 3;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("hellohellohello");
+});
 
 // case: handle Count of 1:
 // Given a target string str and a count equal to 1,
 // When the repeat function is called with these inputs,
 // Then it should return the original str without repetition, ensuring that a count of 1 results in no repetition.
+test("should return the original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
 
 // case: Handle Count of 0:
 // Given a target string str and a count equal to 0,
 // When the repeat function is called with these inputs,
 // Then it should return an empty string, ensuring that a count of 0 results in an empty output.
+test("should return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("");
+});
 
 // case: Negative Count:
 // Given a target string str and a negative integer count,
 // When the repeat function is called with these inputs,
 // Then it should throw an error or return an appropriate error message, as negative counts are not valid.
+test("should throw an error when count is negative", () => {
+  const str = "hello";
+  const count = -1;
+  expect(() => repeat(str, count)).toThrowError("Invalid count");
+});
+
+// case: Empty String:
+// Given an empty string str and a positive integer count,
+// When the repeat function is called with these inputs,
+// Then it should return an empty string, as repeating an empty string any number of times still results in an empty string.
+test("should return an empty string when str is empty", () => {
+  const str = "";
+  const count = 5;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("");
+});
diff --git a/Sprint-3/4-stretch-investigate/password-validator.js b/Sprint-3/4-stretch-investigate/password-validator.js
index b55d527db..54076ab12 100644
--- a/Sprint-3/4-stretch-investigate/password-validator.js
+++ b/Sprint-3/4-stretch-investigate/password-validator.js
@@ -1,6 +1,29 @@
-function passwordValidator(password) {
-    return password.length < 5 ? false : true
+function passwordValidator(password, previousPasswords = []) {
+  switch (true) {
+    case password.length < 5:
+      return false;
+      break;
+    case !/[A-Z]/.test(password):
+      return false;
+      break;
+    case !/[a-z]/.test(password):
+      return false;
+      break;
+    case !/[0-9]/.test(password):
+      return false;
+      break;
+    case !/[!#$%.&*]/.test(password):
+      return false;
+      break;
+    // Check if the password is in the previous passwords array
+    case previousPasswords.includes(password):
+      return false;
+      break;
+    // If all conditions are met, return true
+    default:
+      return true;
+      break;
+  }
 }
 
-
-module.exports = passwordValidator;
\ No newline at end of file
+module.exports = passwordValidator;
diff --git a/Sprint-3/4-stretch-investigate/password-validator.test.js b/Sprint-3/4-stretch-investigate/password-validator.test.js
index 8fa3089d6..92169590c 100644
--- a/Sprint-3/4-stretch-investigate/password-validator.test.js
+++ b/Sprint-3/4-stretch-investigate/password-validator.test.js
@@ -16,11 +16,66 @@ You must breakdown this problem in order to solve it. Find one test case first a
 */
 const isValidPassword = require("./password-validator");
 test("password has at least 5 characters", () => {
-    // Arrange
-    const password = "12345";
-    // Act
-    const result = isValidPassword(password);
-    // Assert
-    expect(result).toEqual(true);
-}
-);
\ No newline at end of file
+  // Arrange
+  const password = "Pass1!";
+  // Act
+  const result = isValidPassword(password);
+  // Assert
+  expect(result).toEqual(true);
+});
+
+test("password has at least one uppercase letter", () => {
+  // Arrange
+  const password = "Password1!";
+  // Act
+  const result = isValidPassword(password);
+  // Assert
+  expect(result).toEqual(true);
+});
+
+test("password has at least one lowercase letter", () => {
+  // Arrange
+  const password = "PASSWORD1!";
+  // Act
+  const result = isValidPassword(password);
+  // Assert
+  expect(result).toEqual(false);
+});
+
+test("password has at least one number", () => {
+  // Arrange
+  const password = "Password!";
+  // Act
+  const result = isValidPassword(password);
+  // Assert
+  expect(result).toEqual(false);
+});
+
+test("password has at least one special character", () => {
+  // Arrange
+  const password = "Password1";
+  // Act
+  const result = isValidPassword(password);
+  // Assert
+  expect(result).toEqual(false);
+});
+
+test("password is not in the previous passwords array", () => {
+  // Arrange
+  const password = "Password1!";
+  const previousPasswords = ["OldPassword1!", "AnotherPassword2!"];
+  // Act
+  const result = isValidPassword(password, previousPasswords);
+  // Assert
+  expect(result).toEqual(true);
+});
+
+test("password is in the previous passwords array", () => {
+  // Arrange
+  const password = "OldPassword1!";
+  const previousPasswords = ["OldPassword1!", "AnotherPassword2!"];
+  // Act
+  const result = isValidPassword(password, previousPasswords);
+  // Assert
+  expect(result).toEqual(false);
+});