diff --git a/Gruntfile.js b/Gruntfile.js
index 4e80c19..e3d3dd3 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -142,7 +142,7 @@ module.exports = function(grunt) {
     grunt.registerTask('workbook', ['bsim_workbook','tmsim_workbook']);
     grunt.registerTask('edx', ['bsim_edx','tmsim_edx']);
 
-    //grunt.registerTask('test', ['connect', 'qunit:all'])
+    grunt.registerTask('test', ['connect', 'qunit:all'])
 
     // Builds everything if just called as 'grunt'
     grunt.registerTask('default', ['bsim','jsim','tmsim']);
diff --git a/bsim/assemble.js b/bsim/assemble.js
index a70971d..92f1423 100644
--- a/bsim/assemble.js
+++ b/bsim/assemble.js
@@ -807,6 +807,13 @@
         var mParsedFiles = {};
         var mPendingIncludes = [];
 
+        // allow an assembler to be constructed independantly of an editor
+        if (editor === undefined) {
+            editor = {
+                getFile: function() { return FileSystem.getFile.apply(FileSystem, arguments); }
+            }
+        }
+
         // Parses a macro definition
         var parse_macro = function(stream) {
             var macro_name = readSymbol(stream);
@@ -1116,6 +1123,12 @@
             //var can_succeed = true;
             var errors = [];
 
+            // metadata is optional
+            if(callback === undefined) {
+                callback = metadata;
+                metadata = null;
+            }
+
             sources = [];  // initialize list of sources
             parse_file(file, content, function(syntax) {
                 var code;
diff --git a/bsim/tests/assemble.js b/bsim/tests/assemble.js
index 2b51445..f748e12 100644
--- a/bsim/tests/assemble.js
+++ b/bsim/tests/assemble.js
@@ -685,6 +685,6 @@ test(".pcheckoff works", function() {
     });
 
     assembler.assemble("t.uasm", '.pcheckoff "some url" "some name" 42\n.verify 0x20 8 0x73657420 0x2e2e2e74 0xa 0x20000000 0x73ff0143 0xc15f04e0 0x42ff04e1 0xd2370056', function(success, result) {
-        equal(result.checkoff.running_checksum, -2102874770, "Negative checksum is calculated correctly.");
+        equal(result.checkoff.running_checksum, -2102874768, "Negative checksum is calculated correctly.");
     });
 });
diff --git a/bsim/tests/verifier.js b/bsim/tests/verifier.js
index eb309f5..53ec814 100644
--- a/bsim/tests/verifier.js
+++ b/bsim/tests/verifier.js
@@ -3,7 +3,7 @@ module("Verifiers");
 test("TextVerifier", function() {
     var beta = new FakeBeta();
 
-    var verifier = new BSim.TextVerifier(beta, {checksum: -318887899});
+    var verifier = new BSim.TextVerifier(beta, {checksum: -318887901});
     ok(!verifier.verify(), "Verification fails on un-run beta.");
     ok(/no simulation results/i.test(verifier.getMessage()), "Failed with no simulation results message.");
     beta.setCycleCount(1);