test_runner: addressing PR comments

Removed additional loop from calculating max counts for functions.
Simplified reporting of count for each line.
Returned arrow function to implicit return.

lib/internal/test_runner/coverage.js

@@ -163,8 +163,10 @@ class TestCoverage {
       for (let j = 0; j < functions.length; ++j) {
         const { isBlockCoverage, ranges } = functions[j];
 
+        let maxCountPerFunction = 0;
         for (let k = 0; k < ranges.length; ++k) {
           const range = ranges[k];
+          maxCountPerFunction = MathMax(maxCountPerFunction, range.count);
 
           mapRangeToLines(range, lines);
 
@@ -190,7 +192,7 @@ class TestCoverage {
           ArrayPrototypePush(functionReports, {
             __proto__: null,
             name: functions[j].functionName,
-            count: MathMax(...ArrayPrototypeMap(ranges, (r) => r.count)),
+            count: maxCountPerFunction,
             line: range.lines[0].line,
           });
 
@@ -207,23 +209,16 @@ class TestCoverage {
 
       for (let j = 0; j < lines.length; ++j) {
         const line = lines[j];
-
-        if (line.covered || line.ignore) {
-          coveredCnt++;
-          if (!line.ignore) {
-            ArrayPrototypePush(lineReports, {
-              __proto__: null,
-              line: line.line,
-              count: line.count,
-            });
-          }
-        } else {
+        if(!line.ignore) {
           ArrayPrototypePush(lineReports, {
             __proto__: null,
             line: line.line,
-            count: 0,
+            count: line.count
           });
         }
+        if (line.covered || line.ignore) {
+          coveredCnt++;
+        }
       }
 
       ArrayPrototypePush(coverageSummary.files, {
@@ -350,6 +345,7 @@ function mapRangeToLines(range, lines) {
         if (count === 0 && startOffset <= line.startOffset &&
             endOffset >= line.endOffset) {
           line.covered = false;
+          line.count = 0;
         }
         if (count > 0 && startOffset <= line.startOffset &&
             endOffset >= line.endOffset) {

lib/internal/test_runner/utils.js

@@ -330,9 +330,8 @@ function getCoverageReport(pad, summary, symbol, color, table) {
     columnPadLengths = ArrayPrototypeMap(kColumns, (column) => (table ? MathMax(column.length, 6) : 0));
     const columnsWidth = ArrayPrototypeReduce(columnPadLengths, (acc, columnPadLength) => acc + columnPadLength + 3, 0);
 
-    uncoveredLinesPadLength = table && ArrayPrototypeReduce(summary.files, (acc, file) => {
-      return MathMax(acc, formatUncoveredLines(getUncoveredLines(file.lines), table).length);
-    }, 0);
+    uncoveredLinesPadLength = table && ArrayPrototypeReduce(summary.files, (acc, file) =>
+      MathMax(acc, formatUncoveredLines(getUncoveredLines(file.lines), table).length), 0);
     uncoveredLinesPadLength = MathMax(uncoveredLinesPadLength, 'uncovered lines'.length);
     const uncoveredLinesWidth = uncoveredLinesPadLength + 2;