feat(server): query eXist-db version

closes #270

components/database.js

@@ -6,7 +6,12 @@ function shutdownDb (client) {
   return client.promisedMethodCall('shutdown', [])
 }
 
+function version (client) {
+  return client.promisedMethodCall('getVersion', [])
+}
+
 module.exports = {
   shutdown: shutdownDb,
-  syncToDisk: syncDbToDisk
+  syncToDisk: syncDbToDisk,
+  version
 }

readme.md

@@ -575,6 +575,15 @@ Returns an array of user info objects (see [getUserInfo()](#getuserinfo)).
 
 Status: working
 
+#### version
+
+Query the eXist-db version running on the server.
+Returns the SemVer version as a string (e.g. `5.4.1` or `6.1.0-SNAPSHOT`).
+
+```js
+db.server.version()
+```
+
 #### syncToDisk
 
 ```js

spec/tests/index.js

@@ -15,6 +15,26 @@ test('check for default mime type extensions', function (t) {
   t.end()
 })
 
+test('raw command', async function (t) {
+  try {
+    const db = connect()
+    const res = await db.client.promisedMethodCall('getVersion', [])
+    t.ok(res, res)
+  } catch (e) {
+    t.fail(e)
+  }
+})
+
+test('get version', async function (t) {
+  try {
+    const db = connect()
+    const res = await db.server.version()
+    t.ok(res, res)
+  } catch (e) {
+    t.fail(e)
+  }
+})
+
 test('extend mime type definitions', function (t) {
   const testPath = 'test.bar'
   const testExtension = 'bar'