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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
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'
$Kernel_trace_var_extra.should == true
end
it "raises ArgumentError if no block or proc is provided" do
-> do
trace_var :$Kernel_trace_var_global
end.should raise_error(ArgumentError)
end
end
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