Manchester| 25-ITP-September | Mahtem T. Mengstu | Sprint 3 | Coursework/sprint 3 practice tdd

Sprint-3/2-practice-tdd/count.js

@@ -1,5 +1,23 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  if (typeof stringOfCharacters!= "string") {
+    throw new Error("Input should be a string");
+  }
+   if (typeof findCharacter !== "string" || findCharacter.length != 1){
+    throw new Error ("Input must be a single character");
+  }
+
+  let count = 0;
+  for(let char of stringOfCharacters) {
+     if (char === findCharacter) {
+      count++;
+     }
+ }
+    return count;
+
 }
 
 module.exports = countChar;
+
+console.log(countChar("amazon", "a"));
+
+// Added lines to check cases and return count of characters.

Sprint-3/2-practice-tdd/count.test.js

@@ -18,7 +18,51 @@ test("should count multiple occurrences of a character", () => {
 });
 
 // Scenario: No Occurrences
-// Given the input string str,
-// 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 the character is not in the string", () => {
+  const str = "hello";
+  const char = "x";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+// Scenario: Case Sensitivity
+
+test("should be case-sensitive when counting characters", () => {
+  const str = "Banana";
+  expect(countChar(str, "a")).toEqual(3);
+  expect(countChar(str, "A")).toEqual(0);
+});
+
+// Scenario: Empty String
+
+test("should return 0 when the input string is empty", () => {
+  const str = "";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+// Scenario : Special characters
+
+test("should count special characters like spaces or punctuation", () => {
+  const str1 = "a b a b";
+  const char1 = " ";
+  expect(countChar(str1, char1)).toEqual(2);
+
+  const str2 = "NO !!!";
+  const char2 = "!";
+  expect(countChar(str2, char2)).toEqual(3);
+});
+
+// Scenario: Invalid inputs
+
+test("should throw error for invalid string input", () => {
+  expect(() => countChar(123, "a")).toThrow("Input should be a string");
+});
+
+test("should throw error for invalid character input", () => {
+  expect(() => countChar("hello", "ab")).toThrow("Input must be a single character");
+});
+
+
+// Added different cases and test using npx jest  

Sprint-3/2-practice-tdd/get-ordinal-number.js

@@ -1,5 +1,25 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  if (!Number.isInteger(num) || num <= 0) {
+    throw new Error("Only positive integers are allowed");
+  }
+  // Handle Exception of 11, 12, 13
+  if (num % 100 >= 11 && num % 100 <= 13) {
+    return num + "th";
+  }
+  // Handle general last-digit cases
+  switch (num % 10) {
+    case 1:
+      return num + "st";
+    case 2:
+      return num + "nd";
+    case 3:
+      return num + "rd";
+    default:
+      return num + "th";
+  }
 }
 
+
 module.exports = getOrdinalNumber;
+
+// Function implemented 

Sprint-3/2-practice-tdd/get-ordinal-number.test.js

@@ -8,6 +8,39 @@ const getOrdinalNumber = require("./get-ordinal-number");
 // When the number is 1,
 // Then the function should return "1st"
 
-test("should return '1st' for 1", () => {
+// Case 1: 1 → Standard ordinals
+
+test("should return correct ordinals for 1, 2, 3, 4, 21, 22, 23, 24", () => {
   expect(getOrdinalNumber(1)).toEqual("1st");
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(21)).toEqual("21st");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(24)).toEqual("24th");
+});
+
+// Case 2: Exceptions 11, 12, 13
+test("should handle exceptions 11, 12, 13 correctly", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(111)).toEqual("111th"); 
+});
+
+// Case 3: Large numbers
+test("should handle larger numbers correctly", () => {
+  expect(getOrdinalNumber(101)).toEqual("101st");
+  expect(getOrdinalNumber(112)).toEqual("112th"); 
+  expect(getOrdinalNumber(123)).toEqual("123rd");
+});
+
+// Case 4: Invalid cases / inputs 
+test("should throw error for zero, negative or non-integer inputs", () => {
+  expect(() => getOrdinalNumber(0)).toThrow("Only positive integers are allowed");
+  expect(() => getOrdinalNumber(-5)).toThrow("Only positive integers are allowed");
+  expect(() => getOrdinalNumber(2.5)).toThrow("Only positive integers are allowed");
 });
+
+// Added possible and invalid cases and tested using npx jest  

Sprint-3/2-practice-tdd/repeat.js

@@ -1,5 +1,15 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if (typeof str !== "string") {
+    throw new Error("Input must be a string");
+  }
+  if (!Number.isInteger(count) || count < 0) {
+    throw new Error("Count must be a non-negative integer");
+  }
+
+  return str.repeat(count);
 }
 
 module.exports = repeat;
+
+
+// Function implemented to repeat string count times. 

Sprint-3/2-practice-tdd/repeat.test.js

@@ -9,24 +9,41 @@ const repeat = require("./repeat");
 // When the repeat function is called with these inputs,
 // Then it should repeat the str count times and return a new string containing the repeated str values.
 
+// Case 1: Repeats String coun times.
+
 test("should repeat the string count times", () => {
   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.
+// case 2:  handle Count of 1:
 
-// 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 the original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  expect(repeat(str, count)).toEqual("hello");
+});
+// Returns the original str without repetition, ensuring that a count of 1 results in no repetition.
 
-// 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.
+// case 3: Handle Count of 0:
+
+test("should return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  expect(repeat(str, count)).toEqual("");
+});
+
+// Returns an empty string, ensuring that a count of 0 results in an empty output.
+
+// Case 4: Negative count
+
+test("should throw an error when count is negative", () => {
+  const str = "hello";
+  const count = -2;
+  expect(() => repeat(str, count)).toThrow("Count must be a non-negative integer");
+});
+// Throws an error or return an appropriate error message, as negative counts are not valid.
+
+// Tested for all case using npx jest