run shared tests from both v3 and v4 of juggler

.eslintignore

@@ -0,0 +1 @@
+**/node_modules/

deps/juggler-v3/package.json

@@ -0,0 +1,8 @@
+{
+    "name": "juggler-v3",
+    "version": "3.0.0",
+    "dependencies": {
+        "loopback-datasource-juggler":"3.x",
+        "should": "^13.2.3"
+    }
+}

deps/juggler-v3/test.js

@@ -0,0 +1,24 @@
+// Copyright IBM Corp. 2019. All Rights Reserved.
+// Node module: loopback-connector-mssql
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+'use strict';
+
+const juggler = require('loopback-datasource-juggler');
+const name = require('./package.json').name;
+
+require('../../test/init');
+
+describe(name, function() {
+  before(function() {
+    return global.resetDataSourceClass(juggler.DataSource);
+  });
+
+  after(function() {
+    return global.resetDataSourceClass();
+  });
+
+  require('loopback-datasource-juggler/test/common.batch.js');
+  require('loopback-datasource-juggler/test/include.test.js');
+});

deps/juggler-v4/package.json

@@ -0,0 +1,8 @@
+{
+    "name": "juggler-v4",
+    "version": "4.0.0",
+    "dependencies": {
+        "loopback-datasource-juggler":"4.x",
+        "should": "^13.2.3"
+    }
+}

deps/juggler-v4/test.js

@@ -0,0 +1,24 @@
+// Copyright IBM Corp. 2019. All Rights Reserved.
+// Node module: loopback-connector-mssql
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+'use strict';
+
+const juggler = require('loopback-datasource-juggler');
+const name = require('./package.json').name;
+
+require('../../test/init');
+
+describe(name, function() {
+  before(function() {
+    return global.resetDataSourceClass(juggler.DataSource);
+  });
+
+  after(function() {
+    return global.resetDataSourceClass();
+  });
+
+  require('loopback-datasource-juggler/test/common.batch.js');
+  require('loopback-datasource-juggler/test/include.test.js');
+});

package.json

@@ -30,7 +30,9 @@
     "bluebird": "^3.5.1",
     "eslint": "^5.2.0",
     "eslint-config-loopback": "^11.0.0",
-    "loopback-datasource-juggler": "^3.0.0",
+    "juggler-v3": "file:./deps/juggler-v3",
+    "juggler-v4": "file:./deps/juggler-v4",
+    "loopback-datasource-juggler": "^3.0.0 || ^4.0.0",
     "mocha": "^5.2.0",
     "rc": "^1.0.0",
     "should": "^13.2.1",
@@ -39,7 +41,7 @@
   "scripts": {
     "lint": "eslint .",
     "pretest": "node pretest.js",
-    "test": "mocha",
+    "test": "mocha test/*.test.js node_modules/juggler-v3/test.js node_modules/juggler-v4/test.js",
     "posttest": "npm run lint",
     "prepublish": "node remove-regenerator.js"
   },

test/init.js

@@ -6,7 +6,8 @@
 'use strict';
 module.exports = require('should');
 
-var DataSource = require('loopback-datasource-juggler').DataSource;
+const juggler = require('loopback-datasource-juggler');
+const DataSource = juggler.DataSource;
 
 var config = {};
 try {
@@ -44,12 +45,21 @@ global.getConfig = function(options) {
   return dbConf;
 };
 
+let db;
+
 global.getDataSource = global.getSchema = function(options) {
   /* global getConfig */
-  var db = new DataSource(require('../'), getConfig(options));
+  db = new DataSource(require('../'), getConfig(options));
   return db;
 };
 
+global.resetDataSourceClass = function(ctor) {
+  DataSource = ctor || juggler.DataSource;
+  const promise = db ? db.disconnect() : Promise.resolve();
+  db = undefined;
+  return promise;
+};
+
 global.connectorCapabilities = {
   ilike: false,
   nilike: false,