test_runner: ignore unmappes lines for coverage

Author: geeksilva97

lib/internal/test_runner/coverage.js

@@ -1,6 +1,7 @@
 'use strict';
 const {
   ArrayFrom,
+  ArrayPrototypeForEach,
   ArrayPrototypeMap,
   ArrayPrototypePush,
   JSONParse,
@@ -365,6 +366,12 @@ class TestCoverage {
         }
       }
       const sourceMap = new SourceMap(data, { __proto__: null, lineLengths });
+      const linesToCover = new SafeSet();
+
+      for (let i = 0; i< sourceMap[kMappings].length; i++) {
+        const { 3: originalLine } = sourceMap[kMappings][i];
+        linesToCover.add(originalLine + 1);
+      }
 
       for (let j = 0; j < functions.length; ++j) {
         const { ranges, functionName, isBlockCoverage } = functions[j];
@@ -413,6 +420,13 @@ class TestCoverage {
           // No mappable ranges. Skip the function.
           continue;
         }
+
+        ArrayPrototypeForEach(this.getLines(newUrl), (mappedLine) => {
+          if (!linesToCover.has(mappedLine.line)) {
+            mappedLine.ignore = true;
+          }
+        });
+
         const newScript = newResult.get(newUrl) ?? { __proto__: null, url: newUrl, functions: [] };
         ArrayPrototypePush(newScript.functions, { __proto__: null, functionName, ranges: newRanges, isBlockCoverage });
         newResult.set(newUrl, newScript);

test/parallel/test-runner-coverage.js

@@ -296,12 +296,12 @@ test('coverage with source maps', skipIfNoInspector, () => {
     '# --------------------------------------------------------------',
     '# file          | line % | branch % | funcs % | uncovered lines',
     '# --------------------------------------------------------------',
-    '# a.test.ts     |  53.85 |   100.00 |  100.00 | 8-13',  // part of a bundle
-    '# b.test.ts     |  55.56 |   100.00 |  100.00 | 1 7-9', // part of a bundle
+    '# a.test.ts     | 100.00 |   100.00 |  100.00 | ', // part of a bundle
+    '# b.test.ts     |  88.89 |   100.00 |  100.00 | 1', // part of a bundle
     '# index.test.js |  71.43 |    66.67 |  100.00 | 6-7',  // no source map
-    '# stdin.test.ts |  57.14 |   100.00 |  100.00 | 4-6',  // Source map without original file
+    '# stdin.test.ts | 100.00 |   100.00 |  100.00 | ', // Source map with original file
     '# --------------------------------------------------------------',
-    '# all files     |  58.33 |    87.50 |  100.00 | ',
+    '# all files     |  91.67 |    87.50 |  100.00 | ',
     '# --------------------------------------------------------------',
     '# end of coverage report',
   ].join('\n');