test_runner: avoid coverage report partial file names

lib/internal/test_runner/utils.js

@@ -1,8 +1,10 @@
 'use strict';
 const {
   ArrayPrototypeFlatMap,
+  ArrayPrototypeForEach,
   ArrayPrototypeJoin,
   ArrayPrototypeMap,
+  ArrayPrototypePop,
   ArrayPrototypePush,
   ArrayPrototypeReduce,
   ArrayPrototypeSome,
@@ -24,7 +26,7 @@ const {
 } = primordials;
 
 const { AsyncResource } = require('async_hooks');
-const { relative } = require('path');
+const { relative, sep } = require('path');
 const { createWriteStream } = require('fs');
 const { pathToFileURL } = require('internal/url');
 const { createDeferredPromise } = require('internal/util');
@@ -409,6 +411,36 @@ const kColumns = ['line %', 'branch %', 'funcs %'];
 const kColumnsKeys = ['coveredLinePercent', 'coveredBranchPercent', 'coveredFunctionPercent'];
 const kSeparator = ' | ';
 
+function buildFileTree(summary) {
+  const tree = { __proto__: null };
+  let treeDepth = 1;
+  let longestFile = 0;
+
+  ArrayPrototypeForEach(summary.files, (file) => {
+    let longestPart = 0;
+    const parts = StringPrototypeSplit(relative(summary.workingDirectory, file.path), sep);
+    let current = tree;
+
+    ArrayPrototypeForEach(parts, (part, index) => {
+      if (!current[part]) {
+        current[part] = { __proto__: null };
+      }
+      current = current[part];
+      // If this is the last part, add the file to the tree
+      if (index === parts.length - 1) {
+        current.file = file;
+      }
+      // Keep track of the longest part for padding
+      longestPart = MathMax(longestPart, part.length);
+    });
+
+    treeDepth = MathMax(treeDepth, parts.length);
+    longestFile = MathMax(longestPart, longestFile);
+  });
+
+  return { __proto__: null, tree, treeDepth, longestFile };
+}
+
 function getCoverageReport(pad, summary, symbol, color, table) {
   const prefix = `${pad}${symbol}`;
   let report = `${color}${prefix}start of coverage report\n`;
@@ -418,11 +450,19 @@ function getCoverageReport(pad, summary, symbol, color, table) {
   let uncoveredLinesPadLength;
   let tableWidth;
 
+  // Create a tree of file paths
+  const { tree, treeDepth, longestFile } = buildFileTree(summary);
   if (table) {
-    // Get expected column sizes
-    filePadLength = table && ArrayPrototypeReduce(summary.files, (acc, file) =>
-      MathMax(acc, relative(summary.workingDirectory, file.path).length), 0);
+    // Calculate expected column sizes based on the tree
+    filePadLength = table && longestFile;
+    filePadLength += (treeDepth - 1);
+    if (color) {
+      filePadLength += 2;
+    }
     filePadLength = MathMax(filePadLength, 'file'.length);
+    if (filePadLength > (process.stdout.columns / 2)) {
+      filePadLength = MathFloor(process.stdout.columns / 2);
+    }
     const fileWidth = filePadLength + 2;
 
     columnPadLengths = ArrayPrototypeMap(kColumns, (column) => (table ? MathMax(column.length, 6) : 0));
@@ -435,26 +475,17 @@ function getCoverageReport(pad, summary, symbol, color, table) {
 
     tableWidth = fileWidth + columnsWidth + uncoveredLinesWidth;
 
-    // Fit with sensible defaults
     const availableWidth = (process.stdout.columns || Infinity) - prefix.length;
     const columnsExtras = tableWidth - availableWidth;
     if (table && columnsExtras > 0) {
-      // Ensure file name is sufficiently visible
-      const minFilePad = MathMin(8, filePadLength);
-      filePadLength -= MathFloor(columnsExtras * 0.2);
-      filePadLength = MathMax(filePadLength, minFilePad);
-
-      // Get rest of available space, subtracting margins
+      filePadLength = MathMin(availableWidth * 0.5, filePadLength);
       uncoveredLinesPadLength = MathMax(availableWidth - columnsWidth - (filePadLength + 2) - 2, 1);
-
-      // Update table width
       tableWidth = availableWidth;
     } else {
       uncoveredLinesPadLength = Infinity;
     }
   }
 
-
   function getCell(string, width, pad, truncate, coverage) {
     if (!table) return string;
 
@@ -469,35 +500,85 @@ function getCoverageReport(pad, summary, symbol, color, table) {
     return result;
   }
 
-  // Head
-  if (table) report += addTableLine(prefix, tableWidth);
-  report += `${prefix}${getCell('file', filePadLength, StringPrototypePadEnd, truncateEnd)}${kSeparator}` +
-            `${ArrayPrototypeJoin(ArrayPrototypeMap(kColumns, (column, i) => getCell(column, columnPadLengths[i], StringPrototypePadStart)), kSeparator)}${kSeparator}` +
-            `${getCell('uncovered lines', uncoveredLinesPadLength, false, truncateEnd)}\n`;
-  if (table) report += addTableLine(prefix, tableWidth);
+  function writeReportLine({ file, depth = 0, coveragesColumns, fileCoverage, uncoveredLines }) {
+    const fileColumn = `${prefix}${StringPrototypeRepeat(' ', depth)}${getCell(file, filePadLength - depth, StringPrototypePadEnd, truncateStart, fileCoverage)}`;
+    const coverageColumns = ArrayPrototypeJoin(ArrayPrototypeMap(coveragesColumns, (coverage, j) => {
+      const coverageText = typeof coverage === 'number' ? NumberPrototypeToFixed(coverage, 2) : coverage;
+      return getCell(coverageText, columnPadLengths[j], StringPrototypePadStart, false, coverage);
+    }), kSeparator);
 
-  // Body
-  for (let i = 0; i < summary.files.length; ++i) {
-    const file = summary.files[i];
-    const relativePath = relative(summary.workingDirectory, file.path);
+    const uncoveredLinesColumn = getCell(uncoveredLines, uncoveredLinesPadLength, false, truncateEnd);
 
-    let fileCoverage = 0;
-    const coverages = ArrayPrototypeMap(kColumnsKeys, (columnKey) => {
-      const percent = file[columnKey];
-      fileCoverage += percent;
-      return percent;
-    });
-    fileCoverage /= kColumnsKeys.length;
+    return `${fileColumn}${kSeparator}${coverageColumns}${kSeparator}${uncoveredLinesColumn}\n`;
+  }
 
-    report += `${prefix}${getCell(relativePath, filePadLength, StringPrototypePadEnd, truncateStart, 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`;
+  function printCoverageBodyTree(tree, depth = 0) {
+    for (const key in tree) {
+      if (tree[key].file) {
+        const file = tree[key].file;
+        const fileName = ArrayPrototypePop(StringPrototypeSplit(file.path, sep));
+
+        let fileCoverage = 0;
+        const coverages = ArrayPrototypeMap(kColumnsKeys, (columnKey) => {
+          const percent = file[columnKey];
+          fileCoverage += percent;
+          return percent;
+        });
+        fileCoverage /= kColumnsKeys.length;
+
+        const uncoveredLines = formatUncoveredLines(getUncoveredLines(file.lines), table);
+
+        report += writeReportLine({
+          __proto__: null,
+          file: fileName,
+          depth: depth,
+          coveragesColumns: coverages,
+          fileCoverage: fileCoverage,
+          uncoveredLines: uncoveredLines,
+        });
+      } else {
+        report += writeReportLine({
+          __proto__: null,
+          file: key,
+          depth: depth,
+          coveragesColumns: ArrayPrototypeMap(columnPadLengths, () => ''),
+          fileCoverage: undefined,
+          uncoveredLines: '',
+        });
+        printCoverageBodyTree(tree[key], depth + 1);
+      }
+    }
   }
 
-  // Foot
+  // -------------------------- Coverage Report --------------------------
+  if (table) report += addTableLine(prefix, tableWidth);
+
+  // Print the header
+  report += writeReportLine({
+    __proto__: null,
+    file: 'file',
+    coveragesColumns: kColumns,
+    fileCoverage: undefined,
+    uncoveredLines: 'uncovered lines',
+  });
+
+  if (table) report += addTableLine(prefix, tableWidth);
+
+  // Print the body
+  printCoverageBodyTree(tree);
+
   if (table) report += addTableLine(prefix, tableWidth);
-  report += `${prefix}${getCell('all files', filePadLength, StringPrototypePadEnd, truncateEnd)}${kSeparator}` +
-            `${ArrayPrototypeJoin(ArrayPrototypeMap(kColumnsKeys, (columnKey, j) => getCell(NumberPrototypeToFixed(summary.totals[columnKey], 2), columnPadLengths[j], StringPrototypePadStart, false, summary.totals[columnKey])), kSeparator)} |\n`;
+
+  // Print the footer
+  const allFilesCoverages = ArrayPrototypeMap(kColumnsKeys, (columnKey) => summary.totals[columnKey]);
+  report += writeReportLine({
+    __proto__: null,
+    file: 'all files',
+    coveragesColumns: allFilesCoverages,
+    fileCoverage: undefined,
+    uncoveredLines: '',
+  });
+
   if (table) report += addTableLine(prefix, tableWidth);
 
   report += `${prefix}end of coverage report\n`;

test/fixtures/test-runner/coverage-snap/a-very-long-long-long-sub-dir/c.js

@@ -0,0 +1,52 @@
+'use strict';
+// Here we can't import common module as the coverage will be different based on the system
+
+// Empty functions that don't do anything
+function doNothing1() {
+  // Not implemented
+}
+
+function doNothing2() {
+  // No logic here
+}
+
+function unusedFunction1() {
+  // Intentionally left empty
+}
+
+function unusedFunction2() {
+  // Another empty function
+}
+
+// Unused variables
+const unusedVariable1 = 'This is never used';
+const unusedVariable2 = 42;
+let unusedVariable3;
+
+// Empty class with no methods
+class UnusedClass {
+  constructor() {
+    // Constructor does nothing
+  }
+}
+
+// Empty object literal
+const emptyObject = {};
+
+// Empty array
+const emptyArray = [];
+
+// Function with parameters but no body
+function doNothingWithParams(param1, param2) {
+  // No implementation
+}
+
+// Function that returns nothing
+function returnsNothing() {
+  // No return statement
+}
+
+// Another unused function
+function unusedFunction3() {
+  // More empty code
+}

test/fixtures/test-runner/output/coverage-width-100-uncovered-lines.snapshot

@@ -15,13 +15,18 @@ ok 1 - Coverage Print Fixed Width 100
 # duration_ms *
 # start of coverage report
 # --------------------------------------------------------------------------------------------------
-# file     | line % | branch % | funcs % | uncovered lines
+# file                                       | line % | branch % | funcs % | uncovered lines
 # --------------------------------------------------------------------------------------------------
-# …ap/a.js |  55.77 |   100.00 |    0.00 | 5-7 9-11 13-15 17-19 29-30 40-42 45-47 50-52
-# …ap/b.js |  45.45 |   100.00 |    0.00 | 5-7 9-11
-# …ines.js |  50.99 |    42.86 |    1.92 | 5-7 9-11 13-15 17-19 29-30 40-42 45-47 50-52 55-57 59-6…
-# …nes.mjs | 100.00 |   100.00 |  100.00 | 
+# test                                       |        |          |         | 
+#  fixtures                                  |        |          |         | 
+#   test-runner                              |        |          |         | 
+#    coverage-snap                           |        |          |         | 
+#     a.js                                   |  55.77 |   100.00 |    0.00 | 5-7 9-11 13-15 17-19 …
+#     b.js                                   |  45.45 |   100.00 |    0.00 | 5-7 9-11
+#     many-uncovered-lines.js                |  50.99 |    42.86 |    1.92 | 5-7 9-11 13-15 17-19 …
+#    output                                  |        |          |         | 
+#     coverage-width-100-uncovered-lines.mjs | 100.00 |   100.00 |  100.00 | 
 # --------------------------------------------------------------------------------------------------
-# all fil… |  52.80 |    60.00 |    1.61 |
+# all files                                  |  52.80 |    60.00 |    1.61 | 
 # --------------------------------------------------------------------------------------------------
 # end of coverage report

test/fixtures/test-runner/output/coverage-width-100.snapshot

@@ -15,12 +15,17 @@ ok 1 - Coverage Print Fixed Width 100
 # duration_ms *
 # start of coverage report
 # --------------------------------------------------------------------------------------------------
-# file                                             | line % | branch % | funcs % | uncovered lines
+# file                       | line % | branch % | funcs % | uncovered lines
 # --------------------------------------------------------------------------------------------------
-# test/fixtures/test-runner/coverage-snap/a.js     |  55.77 |   100.00 |    0.00 | 5-7 9-11 13-15 …
-# test/fixtures/test-runner/coverage-snap/b.js     |  45.45 |   100.00 |    0.00 | 5-7 9-11
-# …tures/test-runner/output/coverage-width-100.mjs | 100.00 |   100.00 |  100.00 | 
+# test                       |        |          |         | 
+#  fixtures                  |        |          |         | 
+#   test-runner              |        |          |         | 
+#    coverage-snap           |        |          |         | 
+#     a.js                   |  55.77 |   100.00 |    0.00 | 5-7 9-11 13-15 17-19 29-30 40-42 45-4…
+#     b.js                   |  45.45 |   100.00 |    0.00 | 5-7 9-11
+#    output                  |        |          |         | 
+#     coverage-width-100.mjs | 100.00 |   100.00 |  100.00 | 
 # --------------------------------------------------------------------------------------------------
-# all files                                        |  60.81 |   100.00 |    0.00 |
+# all files                  |  60.81 |   100.00 |    0.00 | 
 # --------------------------------------------------------------------------------------------------
 # end of coverage report

test/fixtures/test-runner/output/coverage-width-150-uncovered-lines.snapshot

@@ -15,13 +15,18 @@ ok 1 - Coverage Print Fixed Width 150
 # duration_ms *
 # start of coverage report
 # ----------------------------------------------------------------------------------------------------------------------------------------------------
-# file     | line % | branch % | funcs % | uncovered lines
+# file                                       | line % | branch % | funcs % | uncovered lines
 # ----------------------------------------------------------------------------------------------------------------------------------------------------
-# …ap/a.js |  55.77 |   100.00 |    0.00 | 5-7 9-11 13-15 17-19 29-30 40-42 45-47 50-52
-# …ap/b.js |  45.45 |   100.00 |    0.00 | 5-7 9-11
-# …ines.js |  50.99 |    42.86 |    1.92 | 5-7 9-11 13-15 17-19 29-30 40-42 45-47 50-52 55-57 59-61 63-65 67-69 91-93 96-98 100-102 104-106 111-112 …
-# …nes.mjs | 100.00 |   100.00 |  100.00 | 
+# test                                       |        |          |         | 
+#  fixtures                                  |        |          |         | 
+#   test-runner                              |        |          |         | 
+#    coverage-snap                           |        |          |         | 
+#     a.js                                   |  55.77 |   100.00 |    0.00 | 5-7 9-11 13-15 17-19 29-30 40-42 45-47 50-52
+#     b.js                                   |  45.45 |   100.00 |    0.00 | 5-7 9-11
+#     many-uncovered-lines.js                |  50.99 |    42.86 |    1.92 | 5-7 9-11 13-15 17-19 29-30 40-42 45-47 50-52 55-57 59-61 63-65 67-69 91…
+#    output                                  |        |          |         | 
+#     coverage-width-150-uncovered-lines.mjs | 100.00 |   100.00 |  100.00 | 
 # ----------------------------------------------------------------------------------------------------------------------------------------------------
-# all fil… |  52.80 |    60.00 |    1.61 |
+# all files                                  |  52.80 |    60.00 |    1.61 | 
 # ----------------------------------------------------------------------------------------------------------------------------------------------------
 # end of coverage report

test/fixtures/test-runner/output/coverage-width-150.snapshot

@@ -14,13 +14,18 @@ ok 1 - Coverage Print Fixed Width 150
 # todo 0
 # duration_ms *
 # start of coverage report
-# -------------------------------------------------------------------------------------------------------------------------------------
-# file                                                    | line % | branch % | funcs % | uncovered lines
-# -------------------------------------------------------------------------------------------------------------------------------------
-# test/fixtures/test-runner/coverage-snap/a.js            |  55.77 |   100.00 |    0.00 | 5-7 9-11 13-15 17-19 29-30 40-42 45-47 50-52
-# test/fixtures/test-runner/coverage-snap/b.js            |  45.45 |   100.00 |    0.00 | 5-7 9-11
-# test/fixtures/test-runner/output/coverage-width-150.mjs | 100.00 |   100.00 |  100.00 | 
-# -------------------------------------------------------------------------------------------------------------------------------------
-# all files                                               |  60.81 |   100.00 |    0.00 |
-# -------------------------------------------------------------------------------------------------------------------------------------
+# --------------------------------------------------------------------------------------------------------
+# file                       | line % | branch % | funcs % | uncovered lines
+# --------------------------------------------------------------------------------------------------------
+# test                       |        |          |         | 
+#  fixtures                  |        |          |         | 
+#   test-runner              |        |          |         | 
+#    coverage-snap           |        |          |         | 
+#     a.js                   |  55.77 |   100.00 |    0.00 | 5-7 9-11 13-15 17-19 29-30 40-42 45-47 50-52
+#     b.js                   |  45.45 |   100.00 |    0.00 | 5-7 9-11
+#    output                  |        |          |         | 
+#     coverage-width-150.mjs | 100.00 |   100.00 |  100.00 | 
+# --------------------------------------------------------------------------------------------------------
+# all files                  |  60.81 |   100.00 |    0.00 | 
+# --------------------------------------------------------------------------------------------------------
 # end of coverage report

test/fixtures/test-runner/output/coverage-width-40.mjs

@@ -0,0 +1,12 @@
+// Flags: --experimental-test-coverage
+// here we can't import common module as the coverage will be different based on the system
+// Unused imports are here in order to populate the coverage report
+import * as a from '../coverage-snap/b.js';
+import * as b from '../coverage-snap/a.js';
+import * as c from '../coverage-snap/a-very-long-long-long-sub-dir/c.js';
+
+import { test } from 'node:test';
+
+process.stdout.columns = 40;
+
+test(`Coverage Print Fixed Width ${process.stdout.columns}`);