fix: hardcoded '/' in normalized options.fs, fixes #412, #408

Changes including:
- will not call fs.resolve when normalizing `fs`
- removed hardcoded `/`
- mandatory `fs.dirname` for relative reference
- mandatory `fs.sep`, defaults to '/'

test/integration/liquid/fs-option.ts

@@ -6,16 +6,16 @@ use(chaiAsPromised)
 describe('LiquidOptions#fs', function () {
   let engine: Liquid
   const fs = {
-    exists: (x: string) => Promise.resolve(x.match(/^\/root\/files\//)),
-    existsSync: (x: string) => x.match(/^\/root\/files\//),
+    exists: (x: string) => Promise.resolve(!x.match(/not-exist/)),
+    existsSync: (x: string) => !x.match(/not-exist/),
     readFile: (x: string) => Promise.resolve(`content for ${x}`),
     readFileSync: (x: string) => `content for ${x}`,
     fallback: (x: string) => '/root/files/fallback',
-    resolve: (base: string, path: string) => base + path
+    resolve: (base: string, path: string) => base + '/' + path
   }
   beforeEach(function () {
     engine = new Liquid({
-      root: '/root/',
+      root: '/root',
       fs
     } as any)
   })
@@ -25,12 +25,12 @@ describe('LiquidOptions#fs', function () {
   })
 
   it('should support fallback', async function () {
-    const html = await engine.renderFile('notexist/foo')
+    const html = await engine.renderFile('not-exist/foo')
     expect(html).to.equal('content for /root/files/fallback')
   })
 
   it('should support renderSync', function () {
-    const html = engine.renderFileSync('notexist/foo')
+    const html = engine.renderFileSync('not-exist/foo')
     expect(html).to.equal('content for /root/files/fallback')
   })
 
@@ -39,7 +39,7 @@ describe('LiquidOptions#fs', function () {
       root: '/root/',
       fs: { ...fs, fallback: undefined }
     } as any)
-    return expect(engine.renderFile('notexist/foo'))
+    return expect(engine.renderFile('not-exist/foo'))
       .to.be.rejectedWith('Failed to lookup')
   })
 })

test/integration/liquid/liquid.ts

@@ -75,7 +75,7 @@ describe('Liquid', function () {
         extname: '.html'
       })
       return expect(engine.renderFile('/not/exist.html')).to
-        .be.rejectedWith(/Failed to lookup "\/not\/exist.html" in "\/boo\/,\/root\/"/)
+        .be.rejectedWith(/Failed to lookup "\/not\/exist.html" in "\/boo,\/root\/"/)
     })
   })
   describe('#parseFile', function () {
@@ -85,7 +85,7 @@ describe('Liquid', function () {
         extname: '.html'
       })
       return expect(engine.parseFile('/not/exist.html')).to
-        .be.rejectedWith(/Failed to lookup "\/not\/exist.html" in "\/boo\/,\/root\/"/)
+        .be.rejectedWith(/Failed to lookup "\/not\/exist.html" in "\/boo,\/root\/"/)
     })
     it('should fallback to require.resolve in Node.js', async function () {
       const engine = new Liquid({
@@ -144,7 +144,7 @@ describe('Liquid', function () {
         extname: '.html'
       })
       return expect(() => engine.parseFileSync('/not/exist.html'))
-        .to.throw(/Failed to lookup "\/not\/exist.html" in "\/boo\/,\/root\/"/)
+        .to.throw(/Failed to lookup "\/not\/exist.html" in "\/boo,\/root\/"/)
     })
     it('should throw with lookup list when file not exist', function () {
       const engine = new Liquid({
@@ -152,7 +152,7 @@ describe('Liquid', function () {
         extname: '.html'
       })
       return expect(() => engine.parseFileSync('/not/exist.html'))
-        .to.throw(/Failed to lookup "\/not\/exist.html" in "\/boo\/,\/root\/"/)
+        .to.throw(/Failed to lookup "\/not\/exist.html" in "\/boo,\/root\/"/)
     })
   })
   describe('#enderToNodeStream', function () {

test/integration/liquid/root.ts

@@ -1,12 +1,11 @@
 import { normalize } from '../../../src/liquid-options'
 import { expect } from 'chai'
-import { resolve } from 'path'
 
 describe('LiquidOptions#root', function () {
   describe('#normalize ()', function () {
     it('should normalize string typed root array', function () {
       const options = normalize({ root: 'foo' })
-      expect(options.root).to.eql([resolve('foo') + '/'])
+      expect(options.root).to.eql(['foo'])
     })
     it('should normalize null typed root as empty array', function () {
       const options = normalize({ root: null } as any)