MXS-1220: Simplify test creation

The tests now automatically start MaxScale before each test block and stop
it and perform cleanup after the test. This is done by simply calling the
`before.sh` and `after.sh` scripts before each test block.

server/core/test/rest-api/after.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+#
+# This script is run after each test block. It kills the MaxScale process
+# and cleans up the directories that contain generated files.
+#
+
+test -z "$MAXSCALE_DIR" && exit 1
+
+maxscaledir=$MAXSCALE_DIR
+
+pid=`cat $maxscaledir/maxscale.pid`
+echo $pid
+
+for ((i=0;i<60;i++))
+do
+    kill -0 $pid
+
+    if [ $? -eq 0 ]
+    then
+        # Process is still up
+        kill $pid
+
+        if [ $i -gt 3 ]
+        then
+            sleep 0.1
+        fi
+    else
+        break
+    fi
+done
+
+rm -r $maxscaledir/lib/maxscale
+rm -r $maxscaledir/cache/maxscale
+rm -r $maxscaledir/run/maxscale
+mkdir -m 0755 -p $maxscaledir/lib/maxscale
+mkdir -m 0755 -p $maxscaledir/cache/maxscale
+mkdir -m 0755 -p $maxscaledir/run/maxscale

server/core/test/rest-api/before.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+#
+# This script is run before each test block. It starts MaxScale and waits for it
+# to become responsive.
+#
+
+maxscaledir=$MAXSCALE_DIR
+
+test -z "$MAXSCALE_DIR" && exit 1
+
+# Start MaxScale
+$maxscaledir/bin/maxscale -df $maxscaledir/maxscale.cnf >& $maxscaledir/maxscale.output &
+pid=$!
+
+# Wait for MaxScale to start
+for ((i=0;i<60;i++))
+do
+    $maxscaledir/bin/maxadmin help >& /dev/null && break
+    sleep 0.1
+done

server/core/test/rest-api/package.json

@@ -4,7 +4,7 @@
   "repository": "https://github.com/mariadb-corporation/MaxScale",
   "description": "MaxScale REST API tests",
   "scripts": {
-    "test": "mocha"
+    "test": "mocha --timeout 60000 --slow 10000"
   },
   "author": "",
   "license": "SEE LICENSE IN ../../../../LICENSE.txt",

server/core/test/rest-api/test_rest_api.sh

@@ -50,24 +50,12 @@ chmod 0755 $maxscaledir/lib/maxscale
 chmod 0755 $maxscaledir/cache/maxscale
 chmod 0755 $maxscaledir/run/maxscale
 
-# Start MaxScale
-$maxscaledir/bin/maxscale -df $maxscaledir/maxscale.cnf >& $maxscaledir/maxscale.output &
-pid=$!
-
-# Wait for MaxScale to start
-for ((i=0;i<60;i++))
-do
-    $maxscaledir/bin/maxadmin help >& /dev/null && break
-    sleep 1
-done
+# This variable is used to start and stop MaxScale before each test
+export MAXSCALE_DIR=$maxscaledir
 
 # Run tests
 cd $testdir
 npm test
 rval=$?
 
-# Stop MaxScale
-kill $pid
-wait
-
 exit $rval

server/core/test/rest-api/utils.js

@@ -405,6 +405,8 @@ function validate_json(data) {
     return validate_func(JSON.parse(data))
 }
 
+var child_process = require("child_process")
+
 module.exports = function() {
     this.fs = require("fs")
     this.request = require("request-promise-native")
@@ -419,4 +421,18 @@ module.exports = function() {
     this.validate_func = ajv.compile(json_api_schema)
     this.validate = validate_json
     this.base_url = "http://localhost:8989/v1"
+    this.before(function(done) {
+        child_process.execFile("./before.sh", function(err, stdout, stderr) {
+            if (process.env.MAXSCALE_DIR == null) {
+                throw new Error("MAXSCALE_DIR is not set");
+            }
+
+            done()
+        })
+    });
+    this.after(function(done) {
+        child_process.execFile("./after.sh", function(err, stdout, stderr) {
+            done()
+        })
+    });
 }