Allow percentage-based rolling deployments

test/cli/app_test.rb

@@ -38,7 +38,7 @@ class CliAppTest < CliTestCase
     Mrsk::Cli::App.any_instance.stubs(:on).with([ "1.1.1.1" ]) # tag container
 
     # Strategy is used when booting the containers
-    Mrsk::Cli::App.any_instance.expects(:on).with([ "1.1.1.1" ], in: :groups, limit: 3, wait: 30).with_block_given
+    Mrsk::Cli::App.any_instance.expects(:on).with([ "1.1.1.1" ], in: :groups, limit: 3, wait: 2).with_block_given
 
     run_command("boot", config: :with_group_strategy)
   end

test/commander_test.rb

@@ -2,9 +2,7 @@ require "test_helper"
 
 class CommanderTest < ActiveSupport::TestCase
   setup do
-    @mrsk = Mrsk::Commander.new.tap do |mrsk|
-      mrsk.configure config_file: Pathname.new(File.expand_path("fixtures/deploy_with_roles.yml", __dir__))
-    end
+    configure_with(:deploy_with_roles)
   end
 
   test "lazy configuration" do
@@ -55,4 +53,27 @@ class CommanderTest < ActiveSupport::TestCase
     assert_equal [ "web" ], @mrsk.roles_on("1.1.1.1")
     assert_equal [ "workers" ], @mrsk.roles_on("1.1.1.3")
   end
+
+  test "default group strategy" do
+    assert_empty @mrsk.group_strategy
+  end
+
+  test "specific limit group strategy" do
+    configure_with(:deploy_with_group_strategy)
+
+    assert_equal({ in: :groups, limit: 3, wait: 2 }, @mrsk.group_strategy)
+  end
+
+  test "percentage-based group strategy" do
+    configure_with(:deploy_with_precentage_group_strategy)
+
+    assert_equal({ in: :groups, limit: 1, wait: 2 }, @mrsk.group_strategy)
+  end
+
+  private
+    def configure_with(variant)
+      @mrsk = Mrsk::Commander.new.tap do |mrsk|
+        mrsk.configure config_file: Pathname.new(File.expand_path("fixtures/#{variant}.yml", __dir__))
+      end
+    end
 end

test/fixtures/deploy_with_group_strategy.yml

@@ -14,4 +14,4 @@ registry:
 
 boot:
   group_limit: 3
-  group_wait: 30
+  group_wait: 2

test/fixtures/deploy_with_precentage_group_strategy.yml

@@ -0,0 +1,17 @@
+service: app
+image: dhh/app
+servers:
+  web:
+    - "1.1.1.1"
+    - "1.1.1.2"
+  workers:
+    - "1.1.1.3"
+    - "1.1.1.4"
+
+registry:
+  username: user
+  password: pw
+
+boot:
+  group_limit: 25%
+  group_wait: 2