also test for readonly sparse (#37)

* also test for readonly sparse

* pin brittle to 3.1.3

* actually pin

* check sparse error

* try to fix

Author: mafintosh

index.js

@@ -108,7 +108,7 @@ module.exports = class RandomAccessFile extends RandomAccessStorage {
     function onlock (err) {
       if (err) return onerrorafteropen(err)
 
-      if (!self._sparse || !fsext) return onsparse(null)
+      if (!self._sparse || !fsext || self.mode === RDONLY) return onsparse(null)
 
       fsext.sparse(self.fd).then(onsparse, onsparse)
     }

package.json

@@ -18,7 +18,7 @@
     "fs-native-extensions": "^1.1.0"
   },
   "devDependencies": {
-    "brittle": "^3.0.4",
+    "brittle": "^3.3.0",
     "standard": "^17.0.0"
   },
   "repository": {

test/basic.js

@@ -502,6 +502,24 @@ test('readonly mode', function (t) {
   })
 })
 
+test('readonly mode + sparse', function (t) {
+  t.plan(1)
+
+  const filename = gen()
+  const f = new RAF(filename, { sparse: true })
+
+  f.write(0, Buffer.from('hello world'), function () {
+    f.close(function () {
+      const r = new RAF(filename, { writable: false, sparse: true })
+
+      r.read(0, 5, function (_, data) {
+        t.alike(data, Buffer.from('hello'))
+        r.close()
+      })
+    })
+  })
+})
+
 function gen () {
   return path.join(tmp, ++i + '.txt')
 }