1 files changed, 71 insertions, 0 deletions
diff --git a/spec/order_spec.rb b/spec/order_spec.rb
new file mode 100644
index 0000000..fd104fc
--- /dev/null
+++ b/spec/order_spec.rb
@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+require_relative '../lib/felflame'
+
+# class EntitiesTest < Minitest::Test
+
+describe 'Order' do
+  before :all do
+    @result = []
+    @system0 = FelFlame::Systems.new('System1', priority: 0) do
+      @result.push 0
+    end
+    @system2 = FelFlame::Systems.new('System3', priority: 2) do
+      @result.push 2
+    end
+    @system1 = FelFlame::Systems.new('System2', priority: 1) do
+      @result.push 1
+    end
+
+    @scene1 = FelFlame::Scenes.new('Scene0', priority: 1)
+    @scene0 = FelFlame::Scenes.new('Scene0', priority: 0)
+  end
+
+  before :each do
+  end
+
+  after :each do
+    @result.clear
+    @scene0.clear
+    @scene1.clear
+    @system0.priority = 0
+    @system1.priority = 1
+    @system2.priority = 2
+    @scene0.priority = 0
+    @scene1.priority = 1
+  end
+
+  it 'can sort Scenes' do
+    @scene0.add @system0
+    @scene1.add @system1
+    FelFlame::Order.sort(
+      @scene1,
+      @scene0
+    )
+    expect(@scene1.priority < @scene0.priority).to eq(true)
+  end
+
+  it 'can sort Systems' do
+    @scene0.add @system0, @system1, @system2
+    FelFlame::Order.sort(
+      @system2,
+      @system0,
+      @system1
+    )
+    @scene0.call
+    expect(@result).to eq([2, 0, 1])
+  end
+
+  it 'can handle array' do
+    FelFlame::Order.sort(
+      @system0,
+      [
+        @system1,
+        @system2
+      ]
+    )
+    expect(@system0.priority < @system1.priority).to eq(true)
+    expect(@system0.priority < @system2.priority).to eq(true)
+    expect(@system1.priority == @system2.priority).to eq(true)
+  end
+end