--- /dev/null
+var readInstalled = require('../read-installed.js');
+var test = require('tap').test;
+var path = require('path');
+
+test('prerelease packages should not be marked invalid', function(t) {
+ readInstalled(
+ path.join(__dirname, 'fixtures/issue-40'),
+ { log: console.error },
+ function(err, map) {
+ t.strictEqual(map.dependencies.fake.version, '0.1.0-2');
+ t.notOk(map.dependencies.fake.invalid);
+ t.end();
+ }
+ );
+});