webpack/test/configCases/source-map/module-names/index.js

function getSourceMap(filename) {
	var fs = require("fs");
	var source = fs.readFileSync(__dirname + "/" + filename + ".map", "utf-8");
	var map = JSON.parse(source);
	return map;
}

it("should include test.js in SourceMap", function() {
	var allSources = new Set();
	var map = getSourceMap("bundle0.js");
	for(var source of map.sources) allSources.add(source);
	map = getSourceMap("chunk-a.js");
	for(var source of map.sources) allSources.add(source);
	map = getSourceMap("chunk-b.js");
	for(var source of map.sources) allSources.add(source);
	expect(allSources).toContain("module");
	allSources.delete("module");
	expect(allSources).toContain("fallback");
	for(const source of allSources) {
		expect(source).toMatch(/^fallback\**$/);
	}
});

require.ensure(["./test.js"], function(require) {}, "chunk-a");
require.ensure(["./test.js", "./test.js?1"], function(require) {}, "chunk-b");