Lazy load SSM client (#8)

Gemfile.lock

@@ -21,8 +21,8 @@ GEM
       tzinfo (~> 2.0, >= 2.0.5)
     ast (2.4.2)
     aws-eventstream (1.3.0)
-    aws-partitions (1.978.0)
-    aws-sdk-core (3.209.0)
+    aws-partitions (1.989.0)
+    aws-sdk-core (3.209.1)
       aws-eventstream (~> 1, >= 1.3.0)
       aws-partitions (~> 1, >= 1.651.0)
       aws-sigv4 (~> 1.9)
@@ -65,7 +65,7 @@ GEM
     rspec-expectations (3.13.3)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.1)
+    rspec-mocks (3.13.2)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.1)
@@ -87,7 +87,7 @@ GEM
     rubocop-performance (1.22.1)
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
-    rubocop-rails (2.26.1)
+    rubocop-rails (2.26.2)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.52.0, < 2.0)
@@ -97,7 +97,7 @@ GEM
       rubocop-minitest
       rubocop-performance
       rubocop-rails
-    rubocop-rspec (3.0.5)
+    rubocop-rspec (3.1.0)
       rubocop (~> 1.61)
     ruby-progressbar (1.13.0)
     securerandom (0.3.1)

lib/encrypted_credentials/encrypted_environment_variables.rb

@@ -4,13 +4,17 @@
 
 module EncryptedCredentials
   class EncryptedEnvironmentVariables
-    attr_reader :ssm_client, :environment
+    attr_reader :environment
 
     SSM_PARAMETER_NAME_PATTERN = "_SSM_PARAMETER_NAME"
 
-    def initialize(ssm_client: Aws::SSM::Client.new, environment: ENV)
-      @ssm_client = ssm_client
-      @environment = environment
+    def initialize(**options)
+      @ssm_client = options.fetch(:ssm_client) { -> { Aws::SSM::Client.new } }
+      @environment = options.fetch(:environment) { ENV }
+    end
+
+    def ssm_client
+      @ssm_client.respond_to?(:call) ? @ssm_client.call : @ssm_client
     end
 
     def decrypt