@nerdo/code-reviewer/dist/domain/services/__tests__/DiffService.test.js

A web-based visual git diff tool for reviewing code changes between commits, branches, and tags

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const vitest_1 = require("vitest");
const DiffService_1 = require("../DiffService");
(0, vitest_1.describe)('DiffService', () => {
    (0, vitest_1.it)('should generate diff for added lines', () => {
        const diffService = new DiffService_1.DiffService();
        const oldContent = 'line1\nline2';
        const newContent = 'line1\nline2\nline3';
        const hunks = diffService.generateDiff(oldContent, newContent);
        (0, vitest_1.expect)(hunks).toHaveLength(1);
        (0, vitest_1.expect)(hunks[0].lines.length).toBeGreaterThan(0);
        const addedLine = hunks[0].lines.find(l => l.type === 'add' && l.content === 'line3');
        (0, vitest_1.expect)(addedLine).toBeDefined();
    });
    (0, vitest_1.it)('should generate diff for deleted lines', () => {
        const diffService = new DiffService_1.DiffService();
        const oldContent = 'line1\nline2\nline3';
        const newContent = 'line1\nline3';
        const hunks = diffService.generateDiff(oldContent, newContent);
        (0, vitest_1.expect)(hunks).toHaveLength(1);
        const deleteLine = hunks[0].lines.find(l => l.type === 'delete');
        (0, vitest_1.expect)(deleteLine).toBeDefined();
        (0, vitest_1.expect)(deleteLine?.content).toBe('line2');
    });
    (0, vitest_1.it)('should generate diff for modified lines', () => {
        const diffService = new DiffService_1.DiffService();
        const oldContent = 'line1\nline2\nline3';
        const newContent = 'line1\nmodified line2\nline3';
        const hunks = diffService.generateDiff(oldContent, newContent);
        (0, vitest_1.expect)(hunks).toHaveLength(1);
        const lines = hunks[0].lines;
        (0, vitest_1.expect)(lines.find(l => l.type === 'delete' && l.content === 'line2')).toBeDefined();
        (0, vitest_1.expect)(lines.find(l => l.type === 'add' && l.content === 'modified line2')).toBeDefined();
    });
    (0, vitest_1.it)('should handle empty files', () => {
        const diffService = new DiffService_1.DiffService();
        const hunks = diffService.generateDiff('', 'new content');
        (0, vitest_1.expect)(hunks).toHaveLength(1);
        (0, vitest_1.expect)(hunks[0].lines[0].type).toBe('add');
        (0, vitest_1.expect)(hunks[0].lines[0].content).toBe('new content');
    });
    (0, vitest_1.it)('should generate multiple hunks for separated changes', () => {
        const diffService = new DiffService_1.DiffService();
        const { oldContent, newContent } = makeTestLargeFileWithSeparatedChanges();
        const hunks = diffService.generateDiff(oldContent, newContent);
        (0, vitest_1.expect)(hunks.length).toBeGreaterThanOrEqual(2);
    });
    (0, vitest_1.it)('should generate full file diff with all lines included', () => {
        const diffService = new DiffService_1.DiffService();
        const oldContent = 'line1\nline2\nline3\nline4\nline5';
        const newContent = 'line1\nmodified line2\nline3\nline4\nline5\nline6';
        const hunks = diffService.generateFullFileDiff(oldContent, newContent);
        // Should return exactly one hunk containing the entire file
        (0, vitest_1.expect)(hunks).toHaveLength(1);
        const hunk = hunks[0];
        (0, vitest_1.expect)(hunk.oldStart).toBe(1);
        (0, vitest_1.expect)(hunk.newStart).toBe(1);
        (0, vitest_1.expect)(hunk.oldLines).toBe(5); // old file has 5 lines
        (0, vitest_1.expect)(hunk.newLines).toBe(6); // new file has 6 lines
        // Should contain all lines from both files
        const normalLines = hunk.lines.filter(l => l.type === 'normal');
        const deletedLines = hunk.lines.filter(l => l.type === 'delete');
        const addedLines = hunk.lines.filter(l => l.type === 'add');
        // Based on how diff.diffLines works, the expected counts are:
        (0, vitest_1.expect)(normalLines).toHaveLength(3); // line1, line3, line4
        (0, vitest_1.expect)(deletedLines).toHaveLength(2); // original line2, line5 (as part of the last chunk)
        (0, vitest_1.expect)(addedLines).toHaveLength(3); // modified line2, line5 (unchanged but in new position), line6
        // Verify specific content
        (0, vitest_1.expect)(normalLines.find(l => l.content === 'line1')).toBeDefined();
        (0, vitest_1.expect)(normalLines.find(l => l.content === 'line3')).toBeDefined();
        (0, vitest_1.expect)(normalLines.find(l => l.content === 'line4')).toBeDefined();
        (0, vitest_1.expect)(deletedLines.find(l => l.content === 'line2')).toBeDefined();
        (0, vitest_1.expect)(addedLines.find(l => l.content === 'modified line2')).toBeDefined();
        (0, vitest_1.expect)(addedLines.find(l => l.content === 'line6')).toBeDefined();
        // Verify the total number of lines covers the entire file
        (0, vitest_1.expect)(hunk.lines.length).toBe(8); // All lines from both files
    });
    function makeTestLargeFileWithSeparatedChanges() {
        const oldContent = Array.from({ length: 20 }, (_, i) => `line${i + 1}`).join('\n');
        const newContent = oldContent
            .split('\n')
            .map((line, i) => {
            if (i === 2)
                return 'modified line3';
            if (i === 15)
                return 'modified line16';
            return line;
        })
            .join('\n');
        return { oldContent, newContent };
    }
});