test_runner: throw on invalid source map

Author: avivkeller

doc/api/errors.md

@@ -2049,6 +2049,12 @@ type for one of its returned object properties on execution.
 Thrown in case a function option does not return an expected value
 type on execution, such as when a function is expected to return a promise.
 
+<a id="ERR_INVALID_SOURCE_MAP"></a>
+
+### `ERR_INVALID_SOURCE_MAP`
+
+The source map cannot be parsed because it is invalid.
+
 <a id="ERR_INVALID_STATE"></a>
 
 ### `ERR_INVALID_STATE`

lib/internal/errors.js

@@ -1517,6 +1517,7 @@ E('ERR_INVALID_RETURN_VALUE', (input, name, value) => {
   return `Expected ${input} to be returned from the "${name}"` +
          ` function but got ${type}.`;
 }, TypeError, RangeError);
+E('ERR_INVALID_SOURCE_MAP', `Invalid source map for '%s'`, Error);
 E('ERR_INVALID_STATE', 'Invalid state: %s', Error, TypeError, RangeError);
 E('ERR_INVALID_SYNC_FORK_INPUT',
   'Asynchronous forks do not support ' +

lib/internal/test_runner/coverage.js

@@ -29,6 +29,11 @@ const { setupCoverageHooks } = require('internal/util');
 const { tmpdir } = require('os');
 const { join, resolve, relative, matchesGlob } = require('path');
 const { fileURLToPath } = require('internal/url');
+const {
+  codes: {
+    ERR_INVALID_SOURCE_MAP,
+  },
+} = require('internal/errors');
 const { kMappings, SourceMap } = require('internal/source_map/source_map');
 const kCoverageFileRegex = /^coverage-(\d+)-(\d{13})-(\d+)\.json$/;
 const kIgnoreRegex = /\/\* node:coverage ignore next (?<count>\d+ )?\*\//;
@@ -347,67 +352,73 @@ class TestCoverage {
         newResult.set(url, script);
         continue;
       }
-      const { data, lineLengths } = sourceMapCache[url];
-      let offset = 0;
-      const executedLines = ArrayPrototypeMap(lineLengths, (length, i) => {
-        const coverageLine = new CoverageLine(i + 1, offset, null, length + 1);
-        offset += length + 1;
-        return coverageLine;
-      });
-      if (data.sourcesContent != null) {
-        for (let j = 0; j < data.sources.length; ++j) {
-          this.getLines(data.sources[j], data.sourcesContent[j]);
-        }
-      }
-      const sourceMap = new SourceMap(data, { __proto__: null, lineLengths });
 
-      for (let j = 0; j < functions.length; ++j) {
-        const { ranges, functionName, isBlockCoverage } = functions[j];
-        if (ranges == null) {
-          continue;
-        }
-        let newUrl;
-        const newRanges = [];
-        for (let k = 0; k < ranges.length; ++k) {
-          const { startOffset, endOffset, count } = ranges[k];
-          const { lines } = mapRangeToLines(ranges[k], executedLines);
-
-          let startEntry = sourceMap
-            .findEntry(lines[0].line - 1, MathMax(0, startOffset - lines[0].startOffset));
-          const endEntry = sourceMap
-            .findEntry(lines[lines.length - 1].line - 1, (endOffset - lines[lines.length - 1].startOffset) - 1);
-          if (!startEntry.originalSource && endEntry.originalSource &&
-            lines[0].line === 1 && startOffset === 0 && lines[0].startOffset === 0) {
-            // Edge case when the first line is not mappable
-            const { 2: originalSource, 3: originalLine, 4: originalColumn } = sourceMap[kMappings][0];
-            startEntry = { __proto__: null, originalSource, originalLine, originalColumn };
+      try {
+        const { data, lineLengths } = sourceMapCache[url];
+        let offset = 0;
+        const executedLines = ArrayPrototypeMap(lineLengths, (length, i) => {
+          const coverageLine = new CoverageLine(i + 1, offset, null, length + 1);
+          offset += length + 1;
+          return coverageLine;
+        });
+        if (data.sourcesContent != null) {
+          for (let j = 0; j < data.sources.length; ++j) {
+            this.getLines(data.sources[j], data.sourcesContent[j]);
           }
+        }
+        const sourceMap = new SourceMap(data, { __proto__: null, lineLengths });
 
-          if (!startEntry.originalSource || startEntry.originalSource !== endEntry.originalSource) {
-            // The range is not mappable. Skip it.
+        for (let j = 0; j < functions.length; ++j) {
+          const { ranges, functionName, isBlockCoverage } = functions[j];
+          if (ranges == null) {
             continue;
           }
+          let newUrl;
+          const newRanges = [];
+          for (let k = 0; k < ranges.length; ++k) {
+            const { startOffset, endOffset, count } = ranges[k];
+            const { lines } = mapRangeToLines(ranges[k], executedLines);
+
+            let startEntry = sourceMap
+              .findEntry(lines[0].line - 1, MathMax(0, startOffset - lines[0].startOffset));
+            const endEntry = sourceMap
+              .findEntry(lines[lines.length - 1].line - 1, (endOffset - lines[lines.length - 1].startOffset) - 1);
+            if (!startEntry.originalSource && endEntry.originalSource &&
+              lines[0].line === 1 && startOffset === 0 && lines[0].startOffset === 0) {
+              // Edge case when the first line is not mappable
+              const { 2: originalSource, 3: originalLine, 4: originalColumn } = sourceMap[kMappings][0];
+              startEntry = { __proto__: null, originalSource, originalLine, originalColumn };
+            }
 
-          newUrl ??= startEntry?.originalSource;
-          const mappedLines = this.getLines(newUrl);
-          const mappedStartOffset = this.entryToOffset(startEntry, mappedLines);
-          const mappedEndOffset = this.entryToOffset(endEntry, mappedLines) + 1;
-          for (let l = startEntry.originalLine; l <= endEntry.originalLine; l++) {
-            mappedLines[l].count = count;
-          }
+            if (!startEntry.originalSource || startEntry.originalSource !== endEntry.originalSource) {
+              // The range is not mappable. Skip it.
+              continue;
+            }
 
-          ArrayPrototypePush(newRanges, {
-            __proto__: null, startOffset: mappedStartOffset, endOffset: mappedEndOffset, count,
-          });
-        }
+            newUrl ??= startEntry?.originalSource;
+            const mappedLines = this.getLines(newUrl);
+            const mappedStartOffset = this.entryToOffset(startEntry, mappedLines);
+            const mappedEndOffset = this.entryToOffset(endEntry, mappedLines) + 1;
+            for (let l = startEntry.originalLine; l <= endEntry.originalLine; l++) {
+              mappedLines[l].count = count;
+            }
 
-        if (!newUrl) {
-          // No mappable ranges. Skip the function.
-          continue;
+            ArrayPrototypePush(newRanges, {
+              __proto__: null, startOffset: mappedStartOffset, endOffset: mappedEndOffset, count,
+            });
+          }
+
+          if (!newUrl) {
+            // No mappable ranges. Skip the function.
+            continue;
+          }
+          const newScript = newResult.get(newUrl) ?? { __proto__: null, url: newUrl, functions: [] };
+          ArrayPrototypePush(newScript.functions,
+                             { __proto__: null, functionName, ranges: newRanges, isBlockCoverage });
+          newResult.set(newUrl, newScript);
         }
-        const newScript = newResult.get(newUrl) ?? { __proto__: null, url: newUrl, functions: [] };
-        ArrayPrototypePush(newScript.functions, { __proto__: null, functionName, ranges: newRanges, isBlockCoverage });
-        newResult.set(newUrl, newScript);
+      } catch {
+        throw new ERR_INVALID_SOURCE_MAP(url);
       }
     }
 

test/fixtures/test-runner/source-map-invalid/index.js

@@ -6,6 +6,7 @@ const { readdirSync } = require('node:fs');
 const { test } = require('node:test');
 const fixtures = require('../common/fixtures');
 const tmpdir = require('../common/tmpdir');
+const { pathToFileURL } = require('node:url');
 const skipIfNoInspector = {
   skip: !process.features.inspector ? 'inspector disabled' : false
 };
@@ -486,6 +487,22 @@ test('coverage with included and excluded files', skipIfNoInspector, () => {
   assert(!findCoverageFileForPid(result.pid));
 });
 
+test('throws when an invalid source map is used', skipIfNoInspector, () => {
+  const fixture = fixtures.path('test-runner', 'source-map-invalid', 'index.js');
+  const args = [
+    '--test',
+    '--enable-source-maps',
+    '--experimental-test-coverage',
+    '--test-reporter', 'tap',
+    fixture,
+  ];
+
+  const result = spawnSync(process.execPath, args);
+  assert.strictEqual(result.stderr.toString(), '');
+  assert(result.stdout.toString().includes(`Invalid source map for '${pathToFileURL(fixture)}'`));
+  assert.strictEqual(result.status, 1);
+});
+
 test('properly accounts for line endings in source maps', skipIfNoInspector, () => {
   const fixture = fixtures.path('test-runner', 'source-map-line-lengths', 'index.js');
   const args = [