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)

1 files changed, 3 insertions, 4 deletions

diff --git a/test/drawing/tc_title.rb b/test/drawing/tc_title.rb
index eb549b35..f26c307e 100644
--- a/test/drawing/tc_title.rb
+++ b/test/drawing/tc_title.rb
@@ -11,12 +11,11 @@ class TestTitle < Test::Unit::TestCase
     @chart = ws.add_chart Axlsx::Bar3DChart
   end
 
-  def teardown
-  end
+  def teardown; end
 
   def test_initialization
     assert(@title.text == "")
-    assert(@title.cell == nil)
+    assert(@title.cell.nil?)
   end
 
   def test_initialize_title_size
@@ -28,7 +27,7 @@ class TestTitle < Test::Unit::TestCase
     assert_raise(ArgumentError, "text must be a string") { @title.text = 123 }
     @title.cell = @row.cells.first
     @title.text = "bob"
-    assert(@title.cell == nil, "setting title with text clears the cell")
+    assert(@title.cell.nil?, "setting title with text clears the cell")
   end
 
   def test_cell