Minimal fix for warnings

Rakefile

@@ -8,6 +8,7 @@ Rake::TestTask.new(:test) do |test|
   test.libs << 'lib' << 'test'
   test.test_files = FileList['test/test_*.rb']
   test.verbose = true
+  test.warning = true
 end
 
 require 'cucumber/rake/task'

lib/simplecov.rb

@@ -48,7 +48,7 @@ def result
         SimpleCov::ResultMerger.store_result(@result) if @result
         return SimpleCov::ResultMerger.merged_result
       else
-        return @result
+        return @result if defined? @result
       end
     ensure
       self.running = false

lib/simplecov/configuration.rb

@@ -14,7 +14,7 @@ module SimpleCov::Configuration
   # Configure with SimpleCov.root('/my/project/path')
   #
   def root(root=nil)
-    return @root if @root and root.nil?
+    return @root if defined? @root and root.nil?
     @root = File.expand_path(root || Dir.getwd)
   end
 
@@ -24,7 +24,7 @@ def root(root=nil)
   # Configure with SimpleCov.coverage_dir('cov')
   #
   def coverage_dir(dir=nil)
-    return @coverage_dir if @coverage_dir and dir.nil?
+    return @coverage_dir if defined? @coverage_dir and dir.nil?
     @coverage_dir = (dir || 'coverage')
   end
 
@@ -67,7 +67,7 @@ def command_name(name=nil)
   # Configure with: SimpleCov.formatter(SimpleCov::Formatter::SimpleFormatter)
   #
   def formatter(formatter=nil)
-    return @formatter if @formatter and formatter.nil?
+    return @formatter if defined? @formatter and formatter.nil?
     @formatter = formatter
     raise "No formatter configured. Please specify a formatter using SimpleCov.formatter = SimpleCov::Formatter::SimpleFormatter" unless @formatter
     @formatter
@@ -81,7 +81,7 @@ def formatter(formatter=nil)
   # Configure with SimpleCov.nocov_token('skip') or it's alias SimpleCov.skip_token('skip')
   #
   def nocov_token(nocov_token=nil)
-    return @nocov_token if @nocov_token and nocov_token.nil?
+    return @nocov_token if defined? @nocov_token and nocov_token.nil?
     @nocov_token = (nocov_token || 'nocov')
   end
   alias_method :skip_token, :nocov_token

lib/simplecov/result.rb

@@ -58,7 +58,7 @@ def covered_strength
 
     # Returns the count of lines that are covered
     def covered_lines
-      return @covered_lines if @covered_lines
+      return @covered_lines if defined? @covered_lines
       @covered_lines = 0
       @files.each do |file|
         original_result[file.filename].each do |line_result|
@@ -70,7 +70,7 @@ def covered_lines
 
     # Returns the count of missed lines
     def missed_lines
-      return @missed_lines if @missed_lines
+      return @missed_lines if defined? @missed_lines
       @missed_lines = 0
       @files.each do |file|
         original_result[file.filename].each do |line_result|

lib/simplecov/source_file.rb

@@ -84,7 +84,7 @@ def initialize(filename, coverage)
     # Returns all source lines for this file as instances of SimpleCov::SourceFile::Line,
     # and thus including coverage data. Aliased as :source_lines
     def lines
-      return @lines unless @lines.nil?
+      return @lines if defined? @lines
 
       # Warning to identify condition from Issue #56
       if coverage.size > src.size

test/test_source_file.rb

@@ -68,7 +68,7 @@ class TestSourceFile < Test::Unit::TestCase
           @source_file.lines
         end
 
-        assert_match /^Warning: coverage data provided/, captured_output
+        assert_match(/^Warning: coverage data provided/, captured_output)
       end
     end