Added tests for ETag for physical files

test/tests/etagPhysicalFile.js

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+var webdav = require('../../lib/index.js'),
+    Client = require('webdav-fs'),
+    request = require('request'),
+    xml2js = require('xml2js'),
+    path = require('path'),
+    fs = require('fs')
+
+module.exports = (test, options, index) => test('etag of physical file', isValid =>
+{
+    var server = new webdav.WebDAVServer();
+    isValid = isValid.multiple(1, server);
+
+    const filePath = path.join(__dirname, 'etagPhysicalFile', 'testFile.txt')
+    if(fs.existsSync(filePath))
+        fs.unlink(filePath);
+    fs.writeFileSync(filePath, 'Old content');
+
+    server.rootResource.addChild(new webdav.PhysicalFile(filePath), e => {
+        if(e)
+        {
+            isValid(false, e)
+            return;
+        }
+
+        server.start(options.port + index);
+
+        var wfs = Client(
+            "http://127.0.0.1:" + (options.port + index)
+        );
+
+        function propfind(callback)
+        {
+            request({
+                url: "http://127.0.0.1:" + (options.port + index) + '/testFile.txt',
+                method: 'PROPFIND'
+            }, (e, res, body) => {
+                if(e)
+                {
+                    isValid(false, e);
+                    return;
+                }
+
+                xml2js.parseString(body, (e, doc) => {
+                    if(e)
+                        isValid(false, e);
+                    else
+                        callback(doc);
+                });
+            })
+        }
+
+        propfind((doc) => {
+            const etag1 = doc['D:multistatus']['D:response'][0]['D:propstat'][0]['D:prop'][0]['D:getetag'][0];
+
+            propfind((doc) => {
+                const etag2 = doc['D:multistatus']['D:response'][0]['D:propstat'][0]['D:prop'][0]['D:getetag'][0];
+
+                if(etag1 !== etag2)
+                {
+                    isValid(false, 'ETag changed without file change');
+                    return;
+                }
+
+                wfs.writeFile('/testFile.txt', 'New content', (e) => {
+                    if(e)
+                    {
+                        isValid(false, e);
+                        return;
+                    }
+
+                    propfind((doc) => {
+                        const etag3 = doc['D:multistatus']['D:response'][0]['D:propstat'][0]['D:prop'][0]['D:getetag'][0];
+                        if(etag1 === etag3)
+                            isValid(false, 'ETag didn\'t change with file change');
+                        else
+                            isValid(true);
+                    })
+                })
+            })
+        })
+    });
+})

test/tests/etagPhysicalFile/testFile.txt

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+New content