give the test config its own esvm directory that it can purge as much as it likes

tasks/config/esvm.js

@@ -5,13 +5,9 @@ module.exports = function (grunt) {
 
   return {
     options: {
-      directory: directory,
       branch: '2.0',
       fresh: !grunt.option('esvm-no-fresh'),
       config: {
-        path: {
-          data: dataDir
-        },
         network: {
           host: '127.0.0.1'
         },
@@ -22,6 +18,21 @@ module.exports = function (grunt) {
         }
       }
     },
-    dev: {}
+    dev: {
+      options: {
+        directory: resolve(directory, 'dev'),
+        config: {
+          path: {
+            data: dataDir
+          }
+        }
+      }
+    },
+    test: {
+      options: {
+        directory: resolve(directory, 'test'),
+        purge: true
+      }
+    }
   };
 };

tasks/test.js

@@ -1,6 +1,6 @@
 var _ = require('lodash');
 module.exports = function (grunt) {
-  grunt.registerTask('test:server', [ 'esvm:dev', 'simplemocha:all', 'esvm_shutdown:dev' ]);
+  grunt.registerTask('test:server', [ 'esvm:test', 'simplemocha:all', 'esvm_shutdown:test' ]);
   grunt.registerTask('test:browser', [ 'run:testServer', 'karma:unit' ]);
   grunt.registerTask('test:coverage', [ 'run:testCoverageServer', 'karma:coverage' ]);