test_runner: exclude BRDA entries for ignored lines in LCOV reporter

lib/internal/test_runner/reporter/lcov.js

@@ -2,6 +2,7 @@
 
 const { relative } = require('path');
 const Transform = require('internal/streams/transform');
+const { SafeSet } = require('internal/primordials');
 
 // This reporter is based on the LCOV format, as described here:
 // https://ltp.sourceforge.net/coverage/lcov/geninfo.1.php
@@ -68,7 +69,20 @@ class LcovReporter extends Transform {
         // Taken is either '-' if the basic block containing the branch was
         // never executed or a number indicating how often that branch was
         // taken.
+        // Build set of ignored line numbers from coverage data.
+        // A line is ignored if it appears with ignore=true in the file.lines array.
+        const ignoredLineSet = new SafeSet();
+        for (let k = 0; k < file.lines.length; k++) {
+          if (file.lines[k].ignore) {
+            ignoredLineSet.add(file.lines[k].line);
+          }
+        }
+
         for (let j = 0; j < file.branches.length; j++) {
+          // Skip branches that point to ignored lines.
+          if (ignoredLineSet.has(file.branches[j].line)) {
+            continue;
+          }
           lcov += `BRDA:${file.branches[j].line},${j},0,${file.branches[j].count}\n`;
         }
 
@@ -104,4 +118,4 @@ class LcovReporter extends Transform {
   }
 }
 
-module.exports = LcovReporter;
+module.exports = LcovReporter;