Refactor Environment to not inherit from hash

Gemfile.lock

@@ -1,10 +1,10 @@
 PATH
   remote: .
   specs:
-    psenv (0.1.0)
+    psenv (0.2.0)
       aws-sdk-ssm (~> 1)
-    psenv-rails (0.1.0)
-      psenv (= 0.1.0)
+    psenv-rails (0.2.0)
+      psenv (= 0.2.0)
       railties (>= 3.2, < 5.2)
 
 GEM
@@ -31,8 +31,8 @@ GEM
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
     ast (2.4.0)
-    aws-partitions (1.72.0)
-    aws-sdk-core (3.17.1)
+    aws-partitions (1.74.0)
+    aws-sdk-core (3.18.0)
       aws-partitions (~> 1.0)
       aws-sigv4 (~> 1.0)
       jmespath (~> 1.0)
@@ -65,7 +65,7 @@ GEM
     powerpack (0.1.1)
     public_suffix (3.0.2)
     rack (2.0.4)
-    rack-test (0.8.3)
+    rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)

lib/psenv.rb

@@ -9,12 +9,12 @@ module Psenv
 
   def load(*paths)
     paths.unshift(ENV["PARAMETER_STORE_PATH"]) if ENV["PARAMETER_STORE_PATH"]
-    Environment.create(*paths.map { |path| retrieve_variables(path) }).apply
+    Environment.new(*paths.map { |path| retrieve_variables(path) }).apply
   end
 
   def overload(*paths)
     paths.unshift(ENV["PARAMETER_STORE_PATH"]) if ENV["PARAMETER_STORE_PATH"]
-    Environment.create(*paths.map { |path| retrieve_variables(path) }).apply!
+    Environment.new(*paths.map { |path| retrieve_variables(path) }).apply!
   end
 
   def retrieve_variables(path)

lib/psenv/environment.rb

@@ -1,15 +1,17 @@
 module Psenv
-  class Environment < Hash
+  class Environment
+    def initialize(*variables)
+      @variables = variables.reverse.reduce({}, :merge)
+    end
+
     def apply
-      each { |k, v| ENV.store(k.to_s, v) unless ENV.has_key?(k.to_s) }
+      @variables.each do |k, v|
+        ENV.store(k.to_s, v) unless ENV.has_key?(k.to_s)
+      end
     end
 
     def apply!
-      each { |k, v| ENV.store(k.to_s, v) }
-    end
-
-    def self.create(*variables)
-      Environment[variables.reverse.reduce({}, :merge)]
+      @variables.each { |k, v| ENV.store(k.to_s, v) }
     end
   end
 end

lib/psenv/version.rb

@@ -1,3 +1,3 @@
 module Psenv
-  VERSION = "0.1.0".freeze
+  VERSION = "0.2.0".freeze
 end

spec/environment_spec.rb

@@ -4,27 +4,18 @@ RSpec.describe Psenv::Environment do
   let(:environment1) { { A: "1", B: "1" } }
   let(:environment2) { { B: "2", C: "2" } }
 
-  context ".create" do
-    subject { Psenv::Environment.create(environment1, environment2) }
+  context ".new" do
+    subject { Psenv::Environment.new(environment1, environment2) }
 
     it "returns an environment object" do
       expect(subject).to be_kind_of(Psenv::Environment)
     end
-
-    it "is also a hash" do
-      expect(subject).to be_kind_of(Hash)
-    end
-
-    it "creates the correct environment" do
-      expected = { A: "1", B: "1", C: "2" }
-      expect(subject).to eq(expected)
-    end
   end
 
   context "#apply" do
     before(:each) do
       ENV.store("A", "0")
-      environment = Psenv::Environment.create(environment1, environment2)
+      environment = Psenv::Environment.new(environment1, environment2)
       environment.apply
     end
 
@@ -44,7 +35,7 @@ RSpec.describe Psenv::Environment do
   context "#apply!" do
     before(:each) do
       ENV.store("A", "0")
-      environment = Psenv::Environment.create(environment1, environment2)
+      environment = Psenv::Environment.new(environment1, environment2)
       environment.apply!
     end
 

spec/psenv_spec.rb

@@ -19,7 +19,7 @@ RSpec.describe Psenv do
     allow(retriever1).to receive(:call) { env_variables }
     allow(retriever2).to receive(:call) { arg_variables[0] }
     allow(retriever3).to receive(:call) { arg_variables[1] }
-    allow(Psenv::Environment).to receive(:create) { environment }
+    allow(Psenv::Environment).to receive(:new) { environment }
     allow(environment).to receive(:apply)
     allow(environment).to receive(:apply!)
 
@@ -43,7 +43,7 @@ RSpec.describe Psenv do
 
       it "creates the environment with the correct variables" do
         expect(Psenv::Environment).
-          to have_received(:create).with(env_variables)
+          to have_received(:new).with(env_variables)
       end
 
       it "applies the environment" do
@@ -62,7 +62,7 @@ RSpec.describe Psenv do
 
       it "creates the environment with the correct variables" do
         expect(Psenv::Environment).
-          to have_received(:create).with(*arg_variables)
+          to have_received(:new).with(*arg_variables)
       end
 
       it "apples the environment" do
@@ -84,7 +84,7 @@ RSpec.describe Psenv do
 
       it "creates the environment with the correct variables" do
         expect(Psenv::Environment).
-          to have_received(:create).with(env_variables)
+          to have_received(:new).with(env_variables)
       end
 
       it "applies the environment" do
@@ -103,7 +103,7 @@ RSpec.describe Psenv do
 
       it "creates the environment with the correct variables" do
         expect(Psenv::Environment).
-          to have_received(:create).with(*arg_variables)
+          to have_received(:new).with(*arg_variables)
       end
 
       it "apples the environment" do