test: join service

src/pages/string/join/service.ts

@@ -4,9 +4,7 @@ export function mergeText(
   deleteTrailingSpaces: boolean = true,
   joinCharacter: string = ''
 ): string {
-  const lines = text.split('\n');
-
-  let processedLines: string[] = lines;
+  let processedLines: string[] = text.split('\n');
   if (deleteTrailingSpaces) {
     processedLines = processedLines.map((line) => line.trimEnd());
   }

src/pages/string/join/string-join.test.ts

@@ -0,0 +1,64 @@
+import { describe, it, expect } from 'vitest';
+import { mergeText } from './service';
+
+describe('mergeText', () => {
+  it('should merge lines with default settings (delete blank lines, delete trailing spaces, join with empty string)', () => {
+    const input = 'line1  \n  \nline2\nline3  \n\nline4';
+    const expected = 'line1line2line3line4';
+    expect(mergeText(input)).toBe(expected);
+  });
+
+  it('should merge lines and preserve blank lines when deleteBlankLines is false', () => {
+    const input = 'line1  \n  \nline2\nline3  \n\nline4';
+    const expected = 'line1line2line3line4';
+    expect(mergeText(input, false, true, '')).toBe(expected);
+  });
+
+  it('should merge lines and preserve trailing spaces when deleteTrailingSpaces is false', () => {
+    const input = 'line1  \n  \nline2\nline3  \n\nline4';
+    const expected = 'line1  line2line3  line4';
+    expect(mergeText(input, true, false)).toBe(expected);
+  });
+
+  it('should merge lines, preserve blank lines and trailing spaces when both deleteBlankLines and deleteTrailingSpaces are false', () => {
+    const input = 'line1  \n  \nline2\nline3  \n\nline4';
+    const expected = 'line1    line2line3  line4';
+    expect(mergeText(input, false, false)).toBe(expected);
+  });
+
+  it('should merge lines with a specified joinCharacter', () => {
+    const input = 'line1  \n  \nline2\nline3  \n\nline4';
+    const expected = 'line1 line2 line3 line4';
+    expect(mergeText(input, true, true, ' ')).toBe(expected);
+  });
+
+  it('should handle empty input', () => {
+    const input = '';
+    const expected = '';
+    expect(mergeText(input)).toBe(expected);
+  });
+
+  it('should handle input with only blank lines', () => {
+    const input = '  \n  \n\n';
+    const expected = '';
+    expect(mergeText(input)).toBe(expected);
+  });
+
+  it('should handle input with only trailing spaces', () => {
+    const input = 'line1  \nline2  \nline3  ';
+    const expected = 'line1line2line3';
+    expect(mergeText(input)).toBe(expected);
+  });
+
+  it('should handle single line input', () => {
+    const input = 'single line';
+    const expected = 'single line';
+    expect(mergeText(input)).toBe(expected);
+  });
+
+  it('should join lines with new line character when joinCharacter is set to "\\n"', () => {
+    const input = 'line1  \n  \nline2\nline3  \n\nline4';
+    const expected = 'line1\nline2\nline3\nline4';
+    expect(mergeText(input, true, true, '\n')).toBe(expected);
+  });
+});