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London | 26-ITP-Sep | Mahir Shah | Sprint 2 | Practice TDD - #1696

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MahirShah300 wants to merge 11 commits into
CodeYourFuture:mainfrom
MahirShah300:coursework/sprint-3-practice-tdd
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MahirShah300 wants to merge 11 commits into
CodeYourFuture:mainfrom
MahirShah300:coursework/sprint-3-practice-tdd

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@MahirShah300

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Learners, PR Template

Self checklist

  • I have titled my PR with Region | Cohort | FirstName LastName | Sprint | Assignment Title
  • My changes meet the requirements of the task
  • I have tested my changes
  • My changes follow the style guide

Task code

CYF-1060

Changelist

Wrote tests and implemented functions

@MahirShah300 MahirShah300 added the Needs Review Trainee to add when requesting review. PRs without this label will not be reviewed. label Oct 13, 2026
@hackertainment hackertainment added Review in progress This review is currently being reviewed. This label will be replaced by "Reviewed" soon. and removed Needs Review Trainee to add when requesting review. PRs without this label will not be reviewed. labels Oct 18, 2026

@hackertainment hackertainment left a comment

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The code generally looks good to me. Keep it up.

Comment on lines 13 to +32
test("should count multiple occurrences of a character", () => {
const str = "aaaaa";
const char = "a";
const count = countChar(str, char);
expect(count).toEqual(5);
});

test("should count multiple occurrences of a character when mixed with other characters", () => {
const str = "ababa";
const char = "a";
const count = countChar(str, char);
expect(count).toEqual(3);
});

test("should count multiple occurrences of a character at the beginning and end of a string", () => {
const str = "abbba";
const char = "a";
const count = countChar(str, char);
expect(count).toEqual(2);
});

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The 3 cases are all testing str which both starts and ends with the char. Would the program still work correctly if char just exists in the middle part of str?

Comment on lines +39 to +44
test("Should count 0 occurrences of a character", () => {
const str = "aaaaa";
const char = "b";
const count = countChar(str, char);
expect(count).toEqual(0);
});

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There is a special str that would give 0 anyway. Please add that test case as well. Thank you.

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Good coverage of test cases.

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Your test cases are correct. Just for you to think a little bit more, besides const str = "hello", what special string should also be added to each of the test cases?

@hackertainment hackertainment added Reviewed Volunteer to add when completing a review with trainee action still to take. and removed Review in progress This review is currently being reviewed. This label will be replaced by "Reviewed" soon. labels Oct 19, 2026
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