Fix offenses to non-production code

- Lint/AmbiguousBlockAssociation
- Lint/AmbiguousOperatorPrecedence
- Lint/EmptyBlock
- Lint/RedundantSplatExpansion
- Lint/RedundantStringCoercion
- Lint/SymbolConversion
- Lint/UnusedBlockArgument
- Style/BlockDelimiters
- Style/CommentAnnotation
- Style/EachForSimpleLoop
- Style/EmptyMethod
- Style/ExpandPathArguments
- Style/FileWrite
- Style/GlobalStdStream (UNSAFE)
- Style/HashEachMethods (UNSAFE)
- Style/NestedParenthesizedCalls
- Style/NilComparison
- Style/NumericLiteralPrefix (manually fixed)
- Style/ParallelAssignment
- Style/PreferredHashMethods (UNSAFE)
- Style/RedundantInterpolation (UNSAFE)
- Style/RedundantParentheses (UNSAFE)
- Style/RegexpLiteral
- Style/RescueStandardError
- Style/SpecialGlobalVars (UNSAFE)
- Style/SymbolProc (UNSAFE)
- Style/ZeroLengthPredicate (UNSAFE)

3 files changed, 6 insertions, 10 deletions

diff --git a/test/util/tc_mime_type_utils.rb b/test/util/tc_mime_type_utils.rb
index 52c49e2e..e469f31e 100644
--- a/test/util/tc_mime_type_utils.rb
+++ b/test/util/tc_mime_type_utils.rb
@@ -8,8 +8,7 @@ class TestMimeTypeUtils < Test::Unit::TestCase
     @test_img_url = "https://example.com/sample-image.png"
   end
 
-  def teardown
-  end
+  def teardown; end
 
   def test_mime_type_utils
     assert_equal(Axlsx::MimeTypeUtils::get_mime_type(@test_img), 'image/jpeg')
diff --git a/test/util/tc_simple_typed_list.rb b/test/util/tc_simple_typed_list.rb
index fc1ab0a2..5624b903 100644
--- a/test/util/tc_simple_typed_list.rb
+++ b/test/util/tc_simple_typed_list.rb
@@ -4,8 +4,7 @@ class TestSimpleTypedList < Test::Unit::TestCase
     @list = Axlsx::SimpleTypedList.new Integer
   end
 
-  def teardown
-  end
+  def teardown; end
 
   def test_type_is_a_class_or_array_of_class
     assert_nothing_raised { Axlsx::SimpleTypedList.new Integer }
@@ -29,7 +28,7 @@ class TestSimpleTypedList < Test::Unit::TestCase
   end
 
   def test_concat_should_return_index
-    assert(@list.size == 0)
+    assert(@list.empty?)
     assert(@list << 1 == 0)
     assert(@list << 2 == 1)
     @list.delete_at 0
diff --git a/test/util/tc_validators.rb b/test/util/tc_validators.rb
index 7df2e41b..58aa6b7c 100644
--- a/test/util/tc_validators.rb
+++ b/test/util/tc_validators.rb
@@ -1,10 +1,8 @@
 require 'tc_helper.rb'
 class TestValidators < Test::Unit::TestCase
-  def setup
-  end
+  def setup; end
 
-  def teardown
-  end
+  def teardown; end
 
   def test_validators
     # unsigned_int
@@ -20,7 +18,7 @@ class TestValidators < Test::Unit::TestCase
     assert_raise(ArgumentError) { Axlsx.validate_int(Array) }
 
     # boolean (as 0 or 1, :true, :false, true, false, or "true," "false")
-    [0, 1, :true, :false, true, false, "true", "false"].each do |v|
+    [0, 1, :true, :false, true, false, "true", "false"].each do |_v|
       assert_nothing_raised { Axlsx.validate_boolean 0 }
     end
     assert_raise(ArgumentError) { Axlsx.validate_boolean 2 }