Sort cases and add specs

lib/rex/post/meterpreter/extensions/stdapi/sys/registry.rb

@@ -381,13 +381,16 @@ class Registry
   # type (like REG_SZ).
   #
   def self.type2str(type)
-    return REG_SZ if (type == 'REG_SZ')
-    return REG_MULTI_SZ if (type == 'REG_MULTI_SZ')
-    return REG_DWORD if (type == 'REG_DWORD')
-    return REG_BINARY if (type == 'REG_BINARY')
-    return REG_EXPAND_SZ if (type == 'REG_EXPAND_SZ')
-    return REG_NONE if (type == 'REG_NONE')
-    return nil
+    case type
+    when 'REG_BINARY'    then REG_BINARY
+    when 'REG_DWORD'     then REG_DWORD
+    when 'REG_EXPAND_SZ' then REG_EXPAND_SZ
+    when 'REG_MULTI_SZ'  then REG_MULTI_SZ
+    when 'REG_NONE'      then REG_NONE
+    when 'REG_SZ'        then REG_SZ
+    else
+      nil
+    end
   end
 
   #

spec/lib/rex/post/meterpreter/extensions/stdapi/sys/registry_spec.rb

@@ -0,0 +1,34 @@
+require 'rex/post/meterpreter/extensions/stdapi/sys/registry'
+
+RSpec.describe Rex::Post::Meterpreter::Extensions::Stdapi::Sys::Registry do
+
+  describe '.type2str' do
+    subject { described_class.type2str(type) }
+
+    context "with 'REG_BINARY'" do
+      let(:type) { 'REG_BINARY' }
+      it { should eq(3) }
+    end
+    context "with 'REG_DWORD'" do
+      let(:type) { 'REG_DWORD' }
+      it { should eq(4) }
+    end
+    context "with 'REG_EXPAND_SZ'" do
+      let(:type) { 'REG_EXPAND_SZ' }
+      it { should eq(2) }
+    end
+    context "with 'REG_MULTI_SZ'" do
+      let(:type) { 'REG_MULTI_SZ' }
+      it { should eq(7) }
+    end
+    context "with 'REG_NONE'" do
+      let(:type) { 'REG_NONE' }
+      it { should eq(0) }
+    end
+    context "with 'REG_SZ'" do
+      let(:type) { 'REG_SZ' }
+      it { should eq(1) }
+    end
+  end
+
+end