Add cache recommendations for use with Alpine/musl #354

Prevent Windows EBUSY errors during tests

.jshintrc

@@ -4,9 +4,8 @@
   "maxparams": 4,
   "maxcomplexity": 13,
   "globals": {
-    "before": true,
     "beforeEach": true,
-    "after": true,
+    "afterEach": true,
     "describe": true,
     "it": true
   }

docs/changelog.md

@@ -37,7 +37,7 @@
   [#351](https://github.com/lovell/sharp/pull/351)
   [@joelmukuthu](https://github.com/joelmukuthu)
 
-* Check for glibc before downloading pre-compiled binaries.
+* Improve support for musl libc systems e.g. Alpine Linux.
   [#354](https://github.com/lovell/sharp/issues/354)
   [@download13](https://github.com/download13)
 

docs/install.md

@@ -41,6 +41,10 @@ the following command as a user with `sudo` access
 curl -s https://raw.githubusercontent.com/lovell/sharp/master/preinstall.sh | sudo bash -
 ```
 
+For Linux-based operating systems such as Alpine that use musl libc,
+the smaller stack size means libvips' cache should be disabled
+via `sharp.cache(false)` to avoid a stack overflow.
+
 ### Mac OS
 
 [![OS X 10.9.5 Build Status](https://travis-ci.org/lovell/sharp-osx-ci.png?branch=master)](https://travis-ci.org/lovell/sharp-osx-ci)

test/unit/clone.js

@@ -8,10 +8,10 @@ var fixtures = require('../fixtures');
 
 describe('Clone', function() {
 
-  before(function() {
+  beforeEach(function() {
     sharp.cache(false);
   });
-  after(function() {
+  afterEach(function() {
     sharp.cache(true);
   });
 

test/unit/io.js

@@ -8,10 +8,10 @@ var fixtures = require('../fixtures');
 
 describe('Input/output', function() {
 
-  before(function() {
+  beforeEach(function() {
     sharp.cache(false);
   });
-  after(function() {
+  afterEach(function() {
     sharp.cache(true);
   });