test: add tests for runner coverage with different stdout column widths

PR-URL: #54494
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

test/fixtures/test-runner/coverage-snap/a.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/coverage-snap/b.js

@@ -0,0 +1,11 @@
+'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
+}