Fix auto upgrade logic (#758)

test/models/upgrader/upgrade_test.rb

@@ -0,0 +1,36 @@
+require "test_helper"
+
+class UpgradeTest < ActiveSupport::TestCase
+  setup do
+    data = {
+      commit_sha: "latestcommit",
+      version: Semver.new("0.1.0-alpha.2")
+    }
+
+    @commit_upgrade = Upgrader::Upgrade.new "commit", data
+    @release_upgrade = Upgrader::Upgrade.new "release", data
+  end
+
+  test "available if latest commit and app not upgraded" do
+    Maybe.stubs(:version).returns(@commit_upgrade.version)
+    Maybe.stubs(:commit_sha).returns("outdatedcommitsha")
+
+    assert @commit_upgrade.available?
+    assert_not @release_upgrade.available?
+  end
+
+  test "available if latest release and app not upgraded" do
+    Maybe.stubs(:version).returns(Semver.new("0.1.0-alpha.1"))
+    Maybe.stubs(:commit_sha).returns("outdatedcommitsha")
+
+    assert @commit_upgrade.available?
+    assert @release_upgrade.available?
+  end
+
+  test "not available if app commit greater or equal to" do
+    Maybe.stubs(:version).returns(@commit_upgrade.version)
+    Maybe.stubs(:commit_sha).returns(@commit_upgrade.commit_sha)
+
+    assert_not @commit_upgrade.available?
+  end
+end