diff --git a/Gemfile.lock b/Gemfile.lock
index ab170303..a899939f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -203,7 +203,7 @@ GEM
     minitest-rails-capybara (0.0.2)
       capybara
       minitest-rails
-    mocha (2.8.2)
+    mocha (3.0.1)
       ruby2_keywords (>= 0.0.5)
     msgpack (1.8.0)
     multi_json (1.15.0)
diff --git a/test/controllers/stamps_controller_test.rb b/test/controllers/stamps_controller_test.rb
index 01105bdf..5b56b80b 100644
--- a/test/controllers/stamps_controller_test.rb
+++ b/test/controllers/stamps_controller_test.rb
@@ -112,8 +112,8 @@ class StampsControllerTest < ActionController::TestCase
 
     @robot.expects(:valid?)
           .with('58000000180', @lot,
-                '58000000281' => @plate_a,
-                '58000000382' => @plate_b)
+                { '58000000281' => @plate_a,
+                  '58000000382' => @plate_b })
           .returns([true, 'Okay'])
     @request.headers['Accept'] = 'application/json'
     post :validation, params: {
@@ -147,8 +147,8 @@ class StampsControllerTest < ActionController::TestCase
 
     @robot.expects(:valid?)
           .with('58000000180', @lot,
-                '58000000281' => @plate_a,
-                '58000000382' => @plate_c)
+                { '58000000281' => @plate_a,
+                  '58000000382' => @plate_c })
           .returns([false, 'Not okay'])
 
     @request.headers['Accept'] = 'application/json'
@@ -242,13 +242,12 @@ class StampsControllerTest < ActionController::TestCase
 
     @robot.expects(:valid?)
           .with('58000000180', @lot,
-                '58000000281' => @plate_a,
-                '58000000382' => @plate_b)
+                { '58000000281' => @plate_a, '58000000382' => @plate_b })
           .returns([true, 'Okay'])
 
     @robot.expects(:beds_for).with(
-      '58000000281' => @plate_a,
-      '58000000382' => @plate_b
+      { '58000000281' => @plate_a,
+        '58000000382' => @plate_b }
     )
           .returns([
                      { bed: '2', order: 1, qcable: '11111111-2222-3333-4444-100000000001' },
@@ -303,13 +302,13 @@ class StampsControllerTest < ActionController::TestCase
 
     @robot.expects(:valid?)
           .with('58000000180', @lot,
-                '58000000281' => @plate_a,
-                '58000000382' => @plate_b)
+                { '58000000281' => @plate_a,
+                  '58000000382' => @plate_b })
           .returns([true, 'Okay'])
 
     @robot.expects(:beds_for).with(
-      '58000000281' => @plate_a,
-      '58000000382' => @plate_b
+      { '58000000281' => @plate_a,
+        '58000000382' => @plate_b }
     )
           .returns([
                      { bed: '2', order: 1, qcable: '11111111-2222-3333-4444-100000000001' },