diff options
Diffstat (limited to 'spec/ruby/core/kernel/trace_var_spec.rb')
-rw-r--r-- | spec/ruby/core/kernel/trace_var_spec.rb | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/trace_var_spec.rb b/spec/ruby/core/kernel/trace_var_spec.rb new file mode 100644 index 0000000000..07e02feb72 --- /dev/null +++ b/spec/ruby/core/kernel/trace_var_spec.rb @@ -0,0 +1,54 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Kernel#trace_var" do + before :each do + $Kernel_trace_var_global = nil + end + + after :each do + untrace_var :$Kernel_trace_var_global + + $Kernel_trace_var_global = nil + $Kernel_trace_var_extra = nil + end + + it "is a private method" do + Kernel.should have_private_instance_method(:trace_var) + end + + it "hooks assignments to a global variable" do + captured = nil + + trace_var :$Kernel_trace_var_global do |value| + captured = value + end + + $Kernel_trace_var_global = 'foo' + captured.should == 'foo' + end + + it "accepts a proc argument instead of a block" do + captured = nil + + trace_var :$Kernel_trace_var_global, proc {|value| captured = value} + + $Kernel_trace_var_global = 'foo' + captured.should == 'foo' + end + + # String arguments should be evaluated in the context of the caller. + it "accepts a String argument instead of a Proc or block" do + trace_var :$Kernel_trace_var_global, '$Kernel_trace_var_extra = true' + + $Kernel_trace_var_global = 'foo' + + $Kernel_trace_var_extra.should == true + end + + it "raises ArgumentError if no block or proc is provided" do + lambda do + trace_var :$Kernel_trace_var_global + end.should raise_error(ArgumentError) + end +end |