Cape Town | 26-ITP-Jan | Pretty Taruvinga | Sprint 3 | Practice TDD

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

@@ -1,5 +1,11 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }
 
 module.exports = countChar;

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

@@ -3,6 +3,10 @@ const countChar = require("./count");
 // Given a string `str` and a single character `char` to search for,
 // When the countChar function is called with these inputs,
 // Then it should:
+// - Iterate through each character in `str`.
+// - Compare each character to `char`.
+// - Increment a counter each time a match is found.
+// - Return the final count of occurrences of `char` in `str`.
 
 // Scenario: Multiple Occurrences
 // Given the input string `str`,
@@ -22,3 +26,23 @@ test("should count multiple occurrences of a character", () => {
 // And a character `char` that does not exist within `str`.
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of `char` were found.
+test("should return 0 when the character does not occur in the string", () => {
+  const str = "hello world";
+  const char = "x";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+// Scenario: Case Sensitivity
+test("should be case sensitive", () => {
+  const str = "Hello World";
+  const char = "H";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+test("should count non-alphabet characters", () => {
+  const str = "hello!!!";
+  const char = "!";
+  const count = countChar(str, char);
+  expect(count).toEqual(3);
+});

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

@@ -1,5 +1,7 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const suffixes = ["th", "st", "nd", "rd"];
+  const v = num % 100;
+  return num + (suffixes[(v - 20) % 10] || suffixes[v] || suffixes[0]);
 }
 
 module.exports = getOrdinalNumber;

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

@@ -1,9 +1,26 @@
 const getOrdinalNumber = require("./get-ordinal-number");
-// In this week's prep, we started implementing getOrdinalNumber.
+test("should append 'st' for numbers ending with 1, except those ending with 11", () => {
+  expect(getOrdinalNumber(1)).toEqual("1st");
+  expect(getOrdinalNumber(21)).toEqual("21st");
+  expect(getOrdinalNumber(131)).toEqual("131st");
+});
+
+// Case 2: Numbers ending with 2 (but not 12)
+// When the number ends with 2, except those ending with 12,
+// Then the function should return a string by appending "nd" to the number.
+test("should append 'nd' for numbers ending with 2, except those ending with 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(132)).toEqual("132nd");
+});
 
 // Continue testing and implementing getOrdinalNumber for additional cases.
 // Write your tests using Jest — remember to run your tests often for continual feedback.
-
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
 // To ensure thorough testing, we need broad scenarios that cover all possible cases.
 // Listing individual values, however, can quickly lead to an unmanageable number of test cases.
 // Instead of writing tests for individual numbers, consider grouping all possible input values
@@ -13,8 +30,18 @@ const getOrdinalNumber = require("./get-ordinal-number");
 // Case 1: Numbers ending with 1 (but not 11)
 // When the number ends with 1, except those ending with 11,
 // Then the function should return a string by appending "st" to the number.
-test("should append 'st' for numbers ending with 1, except those ending with 11", () => {
-  expect(getOrdinalNumber(1)).toEqual("1st");
-  expect(getOrdinalNumber(21)).toEqual("21st");
-  expect(getOrdinalNumber(131)).toEqual("131st");
+test("should append 'th' for numbers ending with 11, 12, or 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+
+// Case 4: Numbers ending with 0 or 4–9
+// When the number ends with 0 or digits 4–9,
+// Then the function should return a string by appending "th".
+test("should append 'th' for numbers ending with 0 or 4–9", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(14)).toEqual("14th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
 });

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

@@ -1,5 +1,12 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(n, str) {
+  if (!Number.isInteger(n) || n < 0) {
+    throw new Error("Count must be a non-negative integer");
+  }
+  let result = "";
+  for (let i = 0; i < n; i++) {
+    result += str;
+  }
+  return result;
 }
 
 module.exports = repeatStr;

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

@@ -1,32 +1,44 @@
 // Implement a function repeatStr
 const repeatStr = require("./repeat-str");
-// Given a target string `str` and a positive integer `count`,
-// When the repeatStr function is called with these inputs,
-// Then it should:
-
-// Case: handle multiple repetitions:
-// Given a target string `str` and a positive integer `count` greater than 1,
-// When the repeatStr function is called with these inputs,
-// Then it should return a string that contains the original `str` repeated `count` times.
 
+// Case: repeat string multiple times
 test("should repeat the string count times", () => {
   const str = "hello";
   const count = 3;
-  const repeatedStr = repeatStr(str, count);
+  const repeatedStr = repeatStr(count, str);
   expect(repeatedStr).toEqual("hellohellohello");
 });
 
-// Case: handle count of 1:
-// Given a target string `str` and a `count` equal to 1,
-// When the repeatStr function is called with these inputs,
-// Then it should return the original `str` without repetition.
+// Case: count = 1
+test("should return the original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(count, str);
+  expect(repeatedStr).toEqual("hello");
+});
+
+// Case: count = 0
+test("should return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(count, str);
+  expect(repeatedStr).toEqual("");
+});
 
-// Case: Handle count of 0:
-// Given a target string `str` and a `count` equal to 0,
-// When the repeatStr function is called with these inputs,
-// Then it should return an empty string.
+// Case: negative count
+test("should throw an error when count is negative", () => {
+  const str = "hello";
+  const count = -1;
+  expect(() => repeatStr(count, str)).toThrow(
+    "Count must be a non-negative integer"
+  );
+});
 
-// Case: Handle negative count:
-// Given a target string `str` and a negative integer `count`,
-// When the repeatStr function is called with these inputs,
-// Then it should throw an error, as negative counts are not valid.
+// Case: non-integer count
+test("should throw an error when count is not an integer", () => {
+  const str = "hello";
+  const count = 2.5;
+  expect(() => repeatStr(count, str)).toThrow(
+    "Count must be a non-negative integer"
+  );
+});