Auto merge of #2038 - duckinator:fix-conditionals, r=hsbt

Don't use two postfix conditionals on one line.

# Description:

Avoid chaining postfix conditionals (`foo if bar unless baz`) because it's hard to understand.

# Tasks:

- [x] Describe the problem / feature
- [ ] Write tests -- not needed.
- [x] Write code to solve the problem
- [ ] Get code review from coworkers / friends

I will abide by the [code of conduct](https://github.com/rubygems/rubygems/blob/master/CODE_OF_CONDUCT.md).

Author: bundlerbot

test/rubygems/test_gem_stream_ui.rb

@@ -37,7 +37,7 @@ def setup
 
   def test_ask
     skip 'TTY detection broken on windows' if
-      Gem.win_platform? unless RUBY_VERSION > '1.9.2'
+      Gem.win_platform? && RUBY_VERSION <= '1.9.2'
 
     Timeout.timeout(1) do
       expected_answer = "Arthur, King of the Britons"
@@ -49,7 +49,7 @@ def test_ask
 
   def test_ask_no_tty
     skip 'TTY detection broken on windows' if
-      Gem.win_platform? unless RUBY_VERSION > '1.9.2'
+      Gem.win_platform? && RUBY_VERSION <= '1.9.2'
 
     @in.tty = false
 
@@ -61,7 +61,7 @@ def test_ask_no_tty
 
   def test_ask_for_password
     skip 'Always uses $stdin on windows' if
-      Gem.win_platform? unless RUBY_VERSION > '1.9.2'
+      Gem.win_platform? && RUBY_VERSION <= '1.9.2'
 
     Timeout.timeout(1) do
       expected_answer = "Arthur, King of the Britons"
@@ -73,7 +73,7 @@ def test_ask_for_password
 
   def test_ask_for_password_no_tty
     skip 'TTY handling is broken on windows' if
-      Gem.win_platform? unless RUBY_VERSION > '1.9.2'
+      Gem.win_platform? && RUBY_VERSION <= '1.9.2'
 
     @in.tty = false
 
@@ -85,7 +85,7 @@ def test_ask_for_password_no_tty
 
   def test_ask_yes_no_no_tty_with_default
     skip 'TTY handling is broken on windows' if
-      Gem.win_platform? unless RUBY_VERSION > '1.9.2'
+      Gem.win_platform? && RUBY_VERSION <= '1.9.2'
 
     @in.tty = false
 
@@ -100,7 +100,7 @@ def test_ask_yes_no_no_tty_with_default
 
   def test_ask_yes_no_no_tty_without_default
     skip 'TTY handling is broken on windows' if
-      Gem.win_platform? unless RUBY_VERSION > '1.9.2'
+      Gem.win_platform? && RUBY_VERSION <= '1.9.2'
 
     @in.tty = false