[chef] Changing of environment via knife node edit command

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Hi All,

While trying out environments in chef, I tried some steps as mentioned below
for better understanding usage of environments but could not get why the 
result
was something different then what I expected.

Here is what I have tried :

1. I have a recipe. consisting variable x = 5 defined in attributes/attr.rb

2. Then, I created a environment named "testing" for my cookbook named "try".
In this newly created environment, I have specified overirde_attributes
variable x=10

3. We know that "knife node edit <node_name>" command can be used to edit the
details of a node. So, moving ahead I edited environment attribute of node
"client_one" from "_default" to that "testing"

4. Now, my expectation was that if I execute recipe "try"  against this node 
it
should read and print the value of x as 10 but output printed was 5.

Please  let me know how the execution in this scenario does not read value of
variable x from environment.

Thanks