London | 26-ITP-January | Karla Grajales | Sprint 3 | Practice TDD

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

@@ -1,5 +1,15 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+
+  let count = 0;
+
+  for (i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] === findCharacter) {
+      count += 1;
+    }
+  }
+
+  return count;
 }
 
 module.exports = countChar;
+

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

@@ -4,21 +4,41 @@ const countChar = require("./count");
 // When the countChar function is called with these inputs,
 // Then it should:
 
+// Scenario: No Occurrences
+// Given the input string `str`,
+// 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 no occurrences if no found character", () => {
+    const str = "jhhfdd";
+    const char = "r";
+    const count = countChar(str, char);
+    expect(count).toEqual(0);
+  });
+
 // Scenario: Multiple Occurrences
 // Given the input string `str`,
 // And a character `char` that occurs one or more times in `str` (e.g., 'a' in 'aaaaa'),
 // When the function is called with these inputs,
 // Then it should correctly count occurrences of `char`.
-
 test("should count multiple occurrences of a character", () => {
   const str = "aaaaa";
   const char = "a";
   const count = countChar(str, char);
   expect(count).toEqual(5);
 });
 
-// Scenario: No Occurrences
-// Given the input string `str`,
-// 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.
+// case 2
+test("should return 1 when the character appears only once", () => {
+  expect(countChar("hello", "h")).toEqual(1);
+});
+
+// case 3
+test("Should return 0 for empty string", () => {
+  expect(countChar("", "a")).toEqual(0)
+}) 
+
+// case 4
+test("should be case sensitive", () => {
+  expect(countChar("aA", "a")).toEqual(1);
+});

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

@@ -1,5 +1,19 @@
 function getOrdinalNumber(num) {
-  return "1st";
+
+  const lastTwoDigits = num % 100;
+  const lastDigit = num % 10
+
+
+  if (lastTwoDigits === 11 || lastTwoDigits === 12 || lastTwoDigits === 13) {
+    return num + "th";
+  }
+
+
+  if(lastDigit === 1) return num + "st";
+  if(lastDigit === 2) return num + "nd";
+  if(lastDigit === 3) return num + "rd";
+
+  return num + "th"
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,33 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+// Caso 2: number ending in 2 (nd) - but no 12
+test("should append 'nd' for numbers ending with 2, except 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(102)).toEqual("102nd");
+});
+
+// case 3: numbers ending on 3 but no 13
+test("Should append 'rd' for numbers ending with 3, except 13", () => {
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(33)).toEqual("33rd");
+});
+
+// case 4: numbers exception like 11, 12 and 13 append th
+test("should append 'th' for the exceptions 11, 12, and 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+
+// case 5: rest of numbers
+test("should append 'th' for number ending in 4, 5, 6, 7, 8, 9 or 0", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(6)).toEqual("6th");
+  expect(getOrdinalNumber(17)).toEqual("17th");
+  expect(getOrdinalNumber(18)).toEqual("18th");
+  expect(getOrdinalNumber(29)).toEqual("29th");
+  expect(getOrdinalNumber(30)).toEqual("30th");
+});

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

@@ -1,5 +1,31 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count < 0) {
+    throw new Error("count cannot be negative 😭");
+  }
+
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result = result + str;
+  }
+  return result;
 }
 
 module.exports = repeatStr;
+
+
+// Case: Manual inspection of the Error object
+// We use try/catch to log the error message to the console
+// to verify it's working as expected without breaking the test suite.
+test("Should log the specific error message to the console", () => {
+  try {
+    repeatStr("hi", -3);
+  } catch (error) {
+    console.log("Verified Error Message ->", error.message);
+
+    // Check if the message is exactly what we defined
+    expect(error.message).toBe("count cannot be negative 😭");
+  }
+
+  // Also verify that it actually throws using Jest's built-in matcher
+  expect(() => repeatStr("hi", -3)).toThrow();
+});

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

@@ -4,6 +4,8 @@ const repeatStr = require("./repeat-str");
 // When the repeatStr function is called with these inputs,
 // Then it should:
 
+// Clean Code example, Gherkin style (Given/When/Then)
+
 // 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,
@@ -20,13 +22,23 @@ test("should repeat the string count times", () => {
 // 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.
+test("Should return the original string if count is 1", () => {
+  expect(repeatStr("singleStf", 1)).toBe("singleStf");
+});
+
 
 // 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.
+test("Should return an empty string if the count is 0", () => {
+  expect(repeatStr("hello", 0)).toBe("");
+});
 
 // 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.
+test("Should throw an error if the count is negative", () => {
+  expect(() => repeatStr("hi", -3)).toThrow();
+});