/*jshint globalstrict:false, strict:false */
/*global fail, assertEqual, assertTrue, assertFalse, assertNull, assertTypeOf */

////////////////////////////////////////////////////////////////////////////////
/// @brief test collection functionality in a cluster
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2010-2012 triagens GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Jan Steemann
/// @author Copyright 2014, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

var jsunity = require("jsunity");
var arangodb = require("@arangodb");
var ERRORS = arangodb.errors;
var db = arangodb.db;
let internal = require("internal");

////////////////////////////////////////////////////////////////////////////////
/// @brief test suite
////////////////////////////////////////////////////////////////////////////////

function ClusterCollectionSuite () {
  'use strict';
  return {

////////////////////////////////////////////////////////////////////////////////
/// @brief set up
////////////////////////////////////////////////////////////////////////////////

    setUp : function () {
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief tear down
////////////////////////////////////////////////////////////////////////////////

    tearDown : function () {
      try {
        db._drop("UnitTestsClusterCrud");
      }
      catch (err) {
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create, single shard
////////////////////////////////////////////////////////////////////////////////

    testCreateSingleShard : function () {
      var c = db._create("UnitTestsClusterCrud");
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(1, c.shards().length);
      assertTrue(typeof c.shards()[0] === 'string');
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create, multiple shards
////////////////////////////////////////////////////////////////////////////////

    testCreateMultipleShards : function () {
      var c = db._create("UnitTestsClusterCrud", { numberOfShards: 8 });
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(8, c.shards().length);
      for (var i = 0; i < 8; ++i) {
        assertTrue(typeof c.shards()[i] === 'string');
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection
////////////////////////////////////////////////////////////////////////////////

    testCreate : function () {
      var c = db._create("UnitTestsClusterCrud");
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));

      assertEqual(c.name(), db._collection("UnitTestsClusterCrud").name());
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection fail
////////////////////////////////////////////////////////////////////////////////

    testCreateInvalid : function () {
      let invalidNames = ["123", "_x", "_x", "!", "?", "%", "xyz&asd", "&"];
      let properties = {};

      let c;
      invalidNames.forEach(function (collectionName) {
        try {
          c = db._create(collectionName, properties);
          fail();
        } catch (err) {
          assertEqual(ERRORS.ERROR_ARANGO_ILLEGAL_NAME.code, err.errorNum);
        }
      });
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection with replicationFactor
////////////////////////////////////////////////////////////////////////////////

    testCreateValidReplicationFactor : function () {
      let c;
      // would like to test replication to the allowd maximum, but testsuite is
      // starting 2 dbservers, so setting to > 2 is currently not possible
      for ( let i = 1; i < 3; i++) {
        c = db._create("UnitTestsClusterCrud", {
          replicationFactor: i
        });
        assertEqual("UnitTestsClusterCrud", c.name());
        assertEqual(2, c.type());
        assertEqual(3, c.status());
        assertTrue(c.hasOwnProperty("_id"));
        assertEqual(i, c.properties().replicationFactor);
        db._drop("UnitTestsClusterCrud");
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection with replicationFactor && writeConcern
/// writeConcern is equally set to replicationFactor
////////////////////////////////////////////////////////////////////////////////

    testCreateValidMinReplicationFactor : function () {
      let c;
      // would like to test replication to the allowd maximum, but testsuite is
      // starting 2 dbservers, so setting to > 2 is currently not possible
      for ( let i = 1; i < 3; i++) {
        c = db._create("UnitTestsClusterCrud", {
          replicationFactor: i,
          minReplicationFactor: i
        });
        assertEqual("UnitTestsClusterCrud", c.name());
        assertEqual(2, c.type());
        assertEqual(3, c.status());
        assertTrue(c.hasOwnProperty("_id"));
        assertEqual(i, c.properties().replicationFactor);
        assertEqual(i, c.properties().minReplicationFactor);
        assertEqual(i, c.properties().writeConcern);
        db._drop("UnitTestsClusterCrud");
        c = undefined;
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection with replicationFactor && writeConcern
/// writeConcern is set to replicationFactor - 1
////////////////////////////////////////////////////////////////////////////////

    testCreateValidMinReplicationFactorSmaller : function () {
      // would like to test replication to the allowd maximum, but testsuite is
      // starting 2 dbservers, so setting to > 2 is currently not possible
      for ( let i = 2; i < 3; i++) {
        let c = db._create("UnitTestsClusterCrud", {
          replicationFactor: i,
          minReplicationFactor: i - 1
        });
        assertEqual("UnitTestsClusterCrud", c.name());
        assertEqual(2, c.type());
        assertEqual(3, c.status());
        assertTrue(c.hasOwnProperty("_id"));
        assertEqual(i, c.properties().replicationFactor);
        assertEqual(i - 1, c.properties().minReplicationFactor);
        assertEqual(i - 1, c.properties().writeConcern);
        db._drop("UnitTestsClusterCrud");
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection with replicationFactor && writeConcern
/// set to 2. Then decrease both to 1 (update).
////////////////////////////////////////////////////////////////////////////////

    testCreateValidMinReplicationFactorThenDecrease : function () {
      let c = db._create("UnitTestsClusterCrud", {
        replicationFactor: 2,
        writeConcern: 2
      });
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));
      assertEqual(2, c.properties().replicationFactor);
      assertEqual(2, c.properties().minReplicationFactor); // deprecated
      assertEqual(2, c.properties().writeConcern);

      db._collection("UnitTestsClusterCrud").properties({
        replicationFactor: 1,
        writeConcern: 1
      });

      c = db._collection("UnitTestsClusterCrud");
      assertEqual(1, c.properties().replicationFactor);
      assertEqual(1, c.properties().minReplicationFactor); // deprecated
      assertEqual(1, c.properties().writeConcern);

      db._drop("UnitTestsClusterCrud");
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection with replicationFactor && writeConcern
/// set to 1. Then increase both to 2 (update).
////////////////////////////////////////////////////////////////////////////////

    testCreateValidMinReplicationFactorThenIncrease : function () {
      let c = db._create("UnitTestsClusterCrud", {
        replicationFactor: 1,
        writeConcern: 1
      });
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));
      assertEqual(1, c.properties().replicationFactor);
      assertEqual(1, c.properties().minReplicationFactor);
      assertEqual(1, c.properties().writeConcern);

      db._collection("UnitTestsClusterCrud").properties({
        replicationFactor: 2,
        writeConcern: 2
      });

      c = db._collection("UnitTestsClusterCrud");
      assertEqual(2, c.properties().replicationFactor);
      assertEqual(2, c.properties().minReplicationFactor);
      assertEqual(2, c.properties().writeConcern);

      db._drop("UnitTestsClusterCrud");
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection with replicationFactor && writeConcern
/// set to 2. Then increase both to 3 (update).
////////////////////////////////////////////////////////////////////////////////

    testCreateInvalidMinReplicationFactorThenIncrease : function () {
      let c = db._create("UnitTestsClusterCrud", {
        replicationFactor: 2,
        writeConcern: 2
      });
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));
      assertEqual(2, c.properties().replicationFactor);
      assertEqual(2, c.properties().minReplicationFactor);
      assertEqual(2, c.properties().writeConcern);

      try {
        db._collection("UnitTestsClusterCrud").properties({
          replicationFactor: 3,
          minReplicationFactor: 3
        });
        fail();
      } catch (err) {
      }

      c = db._collection("UnitTestsClusterCrud");
      assertEqual(2, c.properties().replicationFactor);
      assertEqual(2, c.properties().minReplicationFactor);
      assertEqual(2, c.properties().writeConcern);

      db._drop("UnitTestsClusterCrud");
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief with invalid input
////////////////////////////////////////////////////////////////////////////////

    testCreateInvalidInputsMinReplicationFactor : function () {
      const invalidMinReplFactors = [null, "a", true, false, [1,2,3], {some: "object"}];

      invalidMinReplFactors.forEach(function(minFactor) {
        try {
          db._create("UnitTestsClusterCrud", {
            replicationFactor: 2,
            minReplicationFactor: minFactor
          });
          fail();
        } catch (err) {
          assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
        }
      });
      invalidMinReplFactors.forEach(function(minFactor) {
        try {
          db._create("UnitTestsClusterCrud", {
            replicationFactor: 2,
            writeConcern: minFactor
          });
          fail();
        } catch (err) {
          assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
        }
      });
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection with minReplicationFactor 0 (invalid)
////////////////////////////////////////////////////////////////////////////////

    testCreateInvalidNumbersMinReplicationFactor : function () {
      const invalidMinReplFactors = [0];

      invalidMinReplFactors.forEach(function(minFactor) {
        try {
          db._create("UnitTestsClusterCrud", {
            replicationFactor: 2,
            minReplicationFactor: minFactor
          });
          fail();
        } catch (err) {
        }
      });
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief create with id
////////////////////////////////////////////////////////////////////////////////

    testCreateWithId: function () {
      var cn = "example", id = "1234567890";

      db._drop(cn);
      db._drop(id);
      var c1 = db._create(cn, {id: id});

      assertTypeOf("string", c1._id);
      assertEqual(id, c1._id);
      assertEqual(cn, c1.name());
      assertTypeOf("number", c1.status());

      var c2 = db._collection(cn);

      assertEqual(c1._id, c2._id);
      assertEqual(c1.name(), c2.name());
      assertEqual(c1.status(), c2.status());

      db._drop(cn);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create collection with replicationFactor && minReplicationFactor
/// minReplicationFactor is set to replicationFactor + 1
////////////////////////////////////////////////////////////////////////////////

    testCreateInvalidMinReplicationFactorBigger : function () {
      try {
        let c;
        for ( let i = 1; i < 3; i++) {
          c = db._create("UnitTestsClusterCrud", {
            replicationFactor: i,
            minReplicationFactor: i + 1
          });
        }
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
      }
      try {
        let c;
        for ( let i = 1; i < 3; i++) {
          c = db._create("UnitTestsClusterCrud", {
            replicationFactor: i,
            writeConcern: i + 1
          });
        }
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateEdge : function () {
      var c = db._createEdgeCollection("UnitTestsClusterCrud");
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(3, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));

      assertEqual(c.name(), db._collection("UnitTestsClusterCrud").name());
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateEdgeMultipleShards : function () {
      var c = db._createEdgeCollection("UnitTestsClusterCrud", { numberOfShards: 8 });
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(3, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));
      assertEqual(8, c.shards().length);

      assertEqual(c.name(), db._collection("UnitTestsClusterCrud").name());
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create / drop
////////////////////////////////////////////////////////////////////////////////

    testCreateDrop : function () {
      var c = db._create("UnitTestsClusterCrud");
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));

      c.drop();
      assertNull(db._collection("UnitTestsClusterCrud"));
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////
    
    testCreateEmptyShardKeysArray : function () {
      db._create("UnitTestsClusterCrud", { shardKeys: [ ] });
      let props = db["UnitTestsClusterCrud"].properties();
      assertEqual(["_key"], props.shardKeys);
    },
    
    testCreateShardKeysOnKey : function () {
      db._create("UnitTestsClusterCrud", { shardKeys: [ "_key" ] });
      let props = db["UnitTestsClusterCrud"].properties();
      assertEqual(["_key"], props.shardKeys);
    },
    
    testCreateShardKeysOnId : function () {
      try {
        db._create("UnitTestsClusterCrud", { shardKeys: [ "_id" ] });
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
      }
    },

    testCreateShardKeysOnRev : function () {
      try {
        db._create("UnitTestsClusterCrud", { shardKeys: [ "_rev" ] });
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
      }
    },

    testCreateIncompleteShardKeys1 : function () {
      db._create("UnitTestsClusterCrud", { shardKeys: [ "", "foo" ] });
      let props = db["UnitTestsClusterCrud"].properties();
      assertEqual(["foo"], props.shardKeys);
    },
    
    testCreateIncompleteShardKeys2 : function () {
      db._create("UnitTestsClusterCrud", { shardKeys: [ "bar", "" ] });
      let props = db["UnitTestsClusterCrud"].properties();
      assertEqual(["bar"], props.shardKeys);
    },

    testCreateShardKeysOnFrom : function () {
      db._create("UnitTestsClusterCrud", { shardKeys: [ "_from" ] });
      let props = db["UnitTestsClusterCrud"].properties();
      assertEqual(["_from"], props.shardKeys);
    },
    
    testCreateShardKeysOnTo : function () {
      db._create("UnitTestsClusterCrud", { shardKeys: [ "_to" ] });
      let props = db["UnitTestsClusterCrud"].properties();
      assertEqual(["_to"], props.shardKeys);
    },
    
    testCreateShardKeysOnFromTo : function () {
      db._create("UnitTestsClusterCrud", { shardKeys: [ "_from", "_to" ] });
      let props = db["UnitTestsClusterCrud"].properties();
      assertEqual(["_from", "_to"], props.shardKeys);
    },

    testCreateShardKeysMixed : function () {
      db._create("UnitTestsClusterCrud", { shardKeys: [ "a", "_from" ] });
      let props = db["UnitTestsClusterCrud"].properties();
      assertEqual(["a", "_from"], props.shardKeys);
    },
    
    testCreateShardKeysMany : function () {
      db._create("UnitTestsClusterCrud", { shardKeys: [ "a", "b", "c", "d", "e", "f", "g", "h" ] });
      let props = db["UnitTestsClusterCrud"].properties();
      assertEqual(["a", "b", "c", "d", "e", "f", "g", "h"], props.shardKeys);
    },
    
    testCreateShardKeysTooMany : function () {
      try {
        // only 8 shard keys are allowed
        db._create("UnitTestsClusterCrud", { shardKeys: [ "a", "b", "c", "d", "e", "f", "g", "h", "i" ] });
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
      }
    },

    testCreateInvalidNumberOfShards1 : function () {
      try {
        db._create("UnitTestsClusterCrud", { numberOfShards : 0 });
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
      }
    },

    testCreateInvalidNumberOfShards2 : function () {
      try {
        db._create("UnitTestsClusterCrud", { numberOfShards : 1024 * 1024 });
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_CLUSTER_TOO_MANY_SHARDS.code, err.errorNum);
      }
    },

    testCreateAsManyShardsAsAllowed : function () {
      let max = internal.maxNumberOfShards;
      if (max > 0) {
        db._create("UnitTestsClusterCrud", { numberOfShards : max });
        let properties = db["UnitTestsClusterCrud"].properties();
        assertEqual(max, properties.numberOfShards);
      }
    },

    testCreateMoreShardsThanAllowed : function () {
      let max = internal.maxNumberOfShards;
      if (max > 0) {
        try {
          db._create("UnitTestsClusterCrud", { numberOfShards : max + 1 });
          fail();
        } catch (err) {
          assertEqual(ERRORS.ERROR_CLUSTER_TOO_MANY_SHARDS.code, err.errorNum);
        }
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test replicationFactor
////////////////////////////////////////////////////////////////////////////////
    
    testMinReplicationFactor : function () {
      let min = internal.minReplicationFactor;
      if (min > 0) {
        db._create("UnitTestsClusterCrud", { replicationFactor: min });
        let properties = db["UnitTestsClusterCrud"].properties();
        assertEqual(min, properties.replicationFactor);

        try {
          db["UnitTestsClusterCrud"].properties({ replicationFactor: min - 1 });
          fail();
        } catch (err) {
          assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
        }
      }
    },
    
    testMaxReplicationFactor : function () {
      let max = internal.maxReplicationFactor;
      if (max > 0) {
        try {
          db._create("UnitTestsClusterCrud", { replicationFactor: max });
          let properties = db["UnitTestsClusterCrud"].properties();
          assertEqual(max, properties.replicationFactor);
          
          try {
            db["UnitTestsClusterCrud"].properties({ replicationFactor: max + 1 });
            fail();
          } catch (err) {
            assertEqual(ERRORS.ERROR_BAD_PARAMETER.code, err.errorNum);
          }
        } catch (err) {
          // if creation fails, then it must have been exactly this error
          assertEqual(ERRORS.ERROR_CLUSTER_INSUFFICIENT_DBSERVERS.code, err.errorNum);
        }
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test count
////////////////////////////////////////////////////////////////////////////////

    testCountAll : function () {
      var c = db._create("UnitTestsClusterCrud", { numberOfShards : 5 });
      for (var i = 0; i < 1000; ++i) {
        c.insert({ value: i });
      }

      assertEqual(1000, c.count());
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test count
////////////////////////////////////////////////////////////////////////////////

    testCountDetailed : function () {
      var c = db._create("UnitTestsClusterCrud", { numberOfShards : 5 });
      for (var i = 0; i < 1000; ++i) {
        c.insert({ value: i });
      }

      var total = 0, res = c.count(true);
      assertEqual(5, Object.keys(res).length);
      Object.keys(res).forEach(function(key) { total += res[key]; });
      assertEqual(1000, total);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateProperties1 : function () {
      var c = db._create("UnitTestsClusterCrud", { numberOfShards : 5, shardKeys: [ "_key" ] });
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));
      assertEqual([ "_key" ], c.properties().shardKeys);
      assertFalse(c.properties().waitForSync);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateProperties2 : function () {
      var c = db._create("UnitTestsClusterCrud", { shardKeys: [ "foo", "bar" ], waitForSync : true });
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));
      assertEqual([ "foo", "bar" ], c.properties().shardKeys);
      assertTrue(c.properties().waitForSync);
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateProperties3 : function () {
      var c = db._create("UnitTestsClusterCrud", { journalSize: 1048576 });
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));
      assertEqual([ "_key" ], c.properties().shardKeys);
      assertFalse(c.properties().waitForSync);
      if (db._engine().name === "mmfiles") {
        assertEqual(1048576, c.properties().journalSize);
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test recreate
////////////////////////////////////////////////////////////////////////////////

    testRecreate : function () {
      var c = db._create("UnitTestsClusterCrud");
      assertEqual("UnitTestsClusterCrud", c.name());
      assertEqual(2, c.type());
      assertEqual(3, c.status());
      assertTrue(c.hasOwnProperty("_id"));

      try {
        db._create("UnitTestsClusterCrud");
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_ARANGO_DUPLICATE_NAME.code, err.errorNum);
      }

      assertEqual(c.name(), db._collection("UnitTestsClusterCrud").name());
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateIllegalName1 : function () {
      try {
        db._create("1234");
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_ARANGO_ILLEGAL_NAME.code, err.errorNum);
      }

      assertNull(db._collection("1234"));
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateIllegalName2 : function () {
      try {
        db._create("");
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_ARANGO_ILLEGAL_NAME.code, err.errorNum);
      }
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateIllegalName3 : function () {
      try {
        db._drop("_foo");
      } catch (e) {
      }

      try {
        db._create("_foo");
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_ARANGO_ILLEGAL_NAME.code, err.errorNum);
      }

      assertNull(db._collection("_foo"));
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateInsufficientDBServersDefault : function () {
      try {
        db._create("bigreplication", {replicationFactor: 8});
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_CLUSTER_INSUFFICIENT_DBSERVERS.code, err.errorNum);
      }
      db._drop('bigreplication');
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateInsufficientDBServersIgnoreReplicationFactor : function () {
      // should not throw (just a warning)
      db._create("bigreplication", {replicationFactor: 8}, {enforceReplicationFactor: false});
      db._drop('bigreplication');
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test create
////////////////////////////////////////////////////////////////////////////////

    testCreateInsufficientDBServersEnforceReplicationFactor : function () {
      try {
        db._create("bigreplication", {replicationFactor: 8}, {enforceReplicationFactor: true});
        fail();
      } catch (err) {
        assertEqual(ERRORS.ERROR_CLUSTER_INSUFFICIENT_DBSERVERS.code, err.errorNum);
      }
      db._drop('bigreplication');
    },

////////////////////////////////////////////////////////////////////////////////
/// @brief test creation / deleting of documents with replication set
////////////////////////////////////////////////////////////////////////////////

    testCreateReplicated : function () {
      var cn = "UnitTestsClusterCrudRepl";
      var c = db._create(cn, { numberOfShards: 2, replicationFactor: 2});

      // store and delete document
      c.save({foo: 'bar'});
      db._query(`FOR x IN @@cn REMOVE x IN @@cn`, {'@cn': cn});
      assertEqual(0, c.toArray().length);

      //insert
      var cursor = db._query(`
        let x = (FOR a IN [1]
                 INSERT {
                   "_key" : "ulf",
                   "super" : "dog"
                 } IN @@cn)
        return x`,
        {'@cn' : cn});
      assertEqual(1, c.toArray().length);

      //update
      cursor = db._query(`
        let x = (UPDATE 'ulf' WITH {
                   "super" : "cat"
                 } IN @@cn RETURN NEW)
        RETURN x`,
        {'@cn' : cn});
      assertEqual(1, c.toArray().length);
      var doc = c.any();
      assertTrue(doc.super === "cat");
      doc = cursor.next();                // should be: cursor >>= id
      assertTrue(doc[0].super === "cat");  // extra [] buy subquery return

      //remove
      cursor = db._query(`
        let x = (REMOVE 'ulf' IN @@cn)
        return x`,
        {'@cn' : cn});
      assertEqual(0, c.toArray().length);

      db._drop(cn);
    },

  };
}

////////////////////////////////////////////////////////////////////////////////
/// @brief executes the test suite
////////////////////////////////////////////////////////////////////////////////

jsunity.run(ClusterCollectionSuite);

return jsunity.done();