DigixGlobal#70 resend_transactions test randomized

test/models/watching_transaction_test.rb

@@ -56,10 +56,9 @@ class WatchingTransactionTest < ActiveSupport::TestCase
     user = create(:user)
     group_id = SecureRandom.uuid
     size = SecureRandom.rand(1..6)
-    size.times do
+    transaction_group = (1..size).map do
       FactoryBot.create(:watching_transaction, group_id: group_id, user: user)
     end
-    latest = FactoryBot.create(:watching_transaction, group_id: group_id, user: user)
 
     pending_stub = stub_request(:post, EthereumApi::SERVER_URL)
                   .with(body: /eth_getTransactionByHash/)
@@ -72,7 +71,7 @@ class WatchingTransactionTest < ActiveSupport::TestCase
                   )
 
     mined_stub = stub_request(:post, EthereumApi::SERVER_URL)
-                      .with(body: /eth_getTransactionByHash.*#{latest.txhash}/)
+                      .with(body: /eth_getTransactionByHash.*#{transaction_group.sample.txhash}/)
                       .to_return(
                         body: {
                           result: {
@@ -83,7 +82,7 @@ class WatchingTransactionTest < ActiveSupport::TestCase
 
     WatchingTransaction.resend_transactions
 
-    assert_requested(pending_stub, times: size + 1)
+    assert_requested(pending_stub, times: size)
     assert_requested(mined_stub, times: 1)
     assert_equal 0, WatchingTransaction.where(group_id: group_id).count,
                  'should destroy all if one is mined'