test_runner: avoid coverage report partial file names

Co-author: Medhansh404 <21ucs126@lnmiit.ac.in>

Author: pmarchini

lib/internal/test_runner/utils.js

@@ -342,9 +342,6 @@ function addTableLine(prefix, width) {
 }
 
 const kHorizontalEllipsis = '\u2026';
-function truncateStart(string, width) {
-  return string.length > width ? `${kHorizontalEllipsis}${StringPrototypeSlice(string, string.length - width + 1)}` : string;
-}
 
 function truncateEnd(string, width) {
   return string.length > width ? `${StringPrototypeSlice(string, 0, width - 1)}${kHorizontalEllipsis}` : string;
@@ -419,7 +416,6 @@ function getCoverageReport(pad, summary, symbol, color, table) {
     }
   }
 
-
   function getCell(string, width, pad, truncate, coverage) {
     if (!table) return string;
 
@@ -434,6 +430,46 @@ function getCoverageReport(pad, summary, symbol, color, table) {
     return result;
   }
 
+  function getfilePathMultiline(string, width, pad, coverage) {
+    if (!table) return string;
+
+    const lines = [];
+    let currentLine = '';
+
+    for (const word of StringPrototypeSplit(string, '\\')) {
+      if (currentLine.length + word.length + 1 <= width) {
+        // If adding the next word fits in the current line, append it
+        currentLine += (currentLine.length > 0 ? '\\' : '') + word;
+      } else {
+        // If adding the next word exceeds the width, start a new line
+        ArrayPrototypePush(lines, currentLine);
+        currentLine = word;
+      }
+    }
+
+    // Add the last line if any
+    if (currentLine.length > 0) {
+      ArrayPrototypePush(lines, currentLine);
+    }
+
+    const truncatedLines = ArrayPrototypeMap(lines, (line) => StringPrototypeSlice(line, 0, width));
+
+    // Delete empty lines if any
+    for (let i = 0; i < truncatedLines.length; ++i) {
+      if (truncatedLines[i].length === 0) {
+        truncatedLines.splice(i, 1);
+      }
+    }
+
+    return getCell(
+      ArrayPrototypeJoin(truncatedLines, '\n'),
+      width,
+      pad,
+      false,
+      coverage,
+    );
+  }
+
   // Head
   if (table) report += addTableLine(prefix, tableWidth);
   report += `${prefix}${getCell('file', filePadLength, StringPrototypePadEnd, truncateEnd)}${kSeparator}` +
@@ -454,7 +490,7 @@ function getCoverageReport(pad, summary, symbol, color, table) {
     });
     fileCoverage /= kColumnsKeys.length;
 
-    report += `${prefix}${getCell(relativePath, filePadLength, StringPrototypePadEnd, truncateStart, fileCoverage)}${kSeparator}` +
+    report += `${prefix}${getfilePathMultiline(relativePath, filePadLength, StringPrototypePadEnd, fileCoverage)}${kSeparator}` +
               `${ArrayPrototypeJoin(ArrayPrototypeMap(coverages, (coverage, j) => getCell(NumberPrototypeToFixed(coverage, 2), columnPadLengths[j], StringPrototypePadStart, false, coverage)), kSeparator)}${kSeparator}` +
               `${getCell(formatUncoveredLines(getUncoveredLines(file.lines), table), uncoveredLinesPadLength, false, truncateEnd)}\n`;
   }