push/atlas: ATLAS_TOKEN env var works [GH-5489]

plugins/pushes/atlas/config.rb

@@ -75,6 +75,7 @@ module VagrantPlugins
       def finalize!
         @address = nil if @address == UNSET_VALUE
         @token = nil if @token == UNSET_VALUE
+        @token = ENV["ATLAS_TOKEN"] if !@token && ENV["ATLAS_TOKEN"] != ""
         @app = nil if @app == UNSET_VALUE
         @dir = "." if @dir == UNSET_VALUE
         @uploader_path = nil if @uploader_path == UNSET_VALUE

test/unit/plugins/pushes/atlas/config_test.rb

@@ -12,6 +12,12 @@ describe VagrantPlugins::AtlasPush::Config do
 
   let(:machine) { double("machine") }
 
+  around(:each) do |example|
+    with_temp_env("ATLAS_TOKEN" => nil) do
+      example.run
+    end
+  end
+
   before do
     subject.token = "foo"
   end
@@ -97,6 +103,17 @@ describe VagrantPlugins::AtlasPush::Config do
         end
       end
 
+      context "when a token is in the environment" do
+        it "uses the token in the Vagrantfile" do
+          with_temp_env("ATLAS_TOKEN" => "foo") do
+            subject.finalize!
+          end
+
+          expect(errors).to be_empty
+          expect(subject.token).to eq("foo")
+        end
+      end
+
       context "when no token is given" do
         before do
           allow(subject).to receive(:token_from_vagrant_login)