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Stub $$ in Bash unit testing
2019 Community Moderator ElectionHow to set process ID in Linux for a specific programGet the source directory of a Bash script from within the script itselfHow do I parse command line arguments in Bash?How to check if a string contains a substring in BashHow to check if a program exists from a Bash script?How do I tell if a regular file does not exist in Bash?How do I split a string on a delimiter in Bash?Extract filename and extension in BashHow to check if a variable is set in Bash?How to concatenate string variables in BashEcho newline in Bash prints literal n
I am using shunit2 to test Bash scripts.
I have a script however whose behaviour depends on the special variable $$. At the moment, my method of verifying its behaviour involves me creating "spies" that expect certain commands to be called. I can't do this here because the commands called depend on the value of $$.
I have seen answers here and here, as mentioned in comments, but they would require me to go outside of Bash and "hack" Linux as it were. My tests usually run on Mac OS X in any case.
Is there any way to set the value of $$ in a unit test or otherwise "stub" it out?
bash shunit2
asked Mar 7 at 11:02
Alex HarveyAlex Harvey
5,1861923
|
show 3 more comments
I am using shunit2 to test Bash scripts.
I have a script however whose behaviour depends on the special variable $$. At the moment, my method of verifying its behaviour involves me creating "spies" that expect certain commands to be called. I can't do this here because the commands called depend on the value of $$.
I have seen answers here and here, as mentioned in comments, but they would require me to go outside of Bash and "hack" Linux as it were. My tests usually run on Mac OS X in any case.
Is there any way to set the value of $$ in a unit test or otherwise "stub" it out?
bash shunit2
asked Mar 7 at 11:02
Alex HarveyAlex Harvey
5,1861923
See here: stackoverflow.com/q/18122592/402322 and here unix.stackexchange.com/a/131635/7167
– ceving
Mar 7 at 11:12
Oh thanks. I didn't see that although it is a slightly different question and in any case I don't think suggests a way forward for what to do in a unit test. E.g. I can't assume the test environment is Linux, because it's probably Mac OS X etc.
– Alex Harvey
Mar 7 at 11:15
I updated the question.
– Alex Harvey
Mar 7 at 11:22
How precisely does value of $$ cause different commands to be run? Are you testing whether it's odd or even? Power of 3? Prime?
– jhnc
Mar 7 at 12:05
1
Okay, think I might understand. haven't used shunit2. Couple of ideas: 1) wrap relevant assertion actual args to rewrite/filter known unknowns; 2) replace any use of $$ in code with a function that can be mocked
– jhnc
Mar 7 at 13:58
|
show 3 more comments
I am using shunit2 to test Bash scripts.
I have a script however whose behaviour depends on the special variable $$. At the moment, my method of verifying its behaviour involves me creating "spies" that expect certain commands to be called. I can't do this here because the commands called depend on the value of $$.
I have seen answers here and here, as mentioned in comments, but they would require me to go outside of Bash and "hack" Linux as it were. My tests usually run on Mac OS X in any case.
Is there any way to set the value of $$ in a unit test or otherwise "stub" it out?
bash shunit2
asked Mar 7 at 11:02
Alex HarveyAlex Harvey
5,1861923
I am using shunit2 to test Bash scripts.
I have a script however whose behaviour depends on the special variable $$. At the moment, my method of verifying its behaviour involves me creating "spies" that expect certain commands to be called. I can't do this here because the commands called depend on the value of $$.
I have seen answers here and here, as mentioned in comments, but they would require me to go outside of Bash and "hack" Linux as it were. My tests usually run on Mac OS X in any case.
Is there any way to set the value of $$ in a unit test or otherwise "stub" it out?
bash shunit2
bash shunit2
asked Mar 7 at 11:02
Alex HarveyAlex Harvey
5,1861923
asked Mar 7 at 11:02
Alex HarveyAlex Harvey
5,1861923
edited Mar 7 at 11:22
Alex Harvey
asked Mar 7 at 11:02
Alex HarveyAlex Harvey
5,1861923
asked Mar 7 at 11:02
Alex HarveyAlex Harvey
5,1861923
asked Mar 7 at 11:02
Alex HarveyAlex Harvey
5,1861923
5,1861923
See here: stackoverflow.com/q/18122592/402322 and here unix.stackexchange.com/a/131635/7167
– ceving
Mar 7 at 11:12
Oh thanks. I didn't see that although it is a slightly different question and in any case I don't think suggests a way forward for what to do in a unit test. E.g. I can't assume the test environment is Linux, because it's probably Mac OS X etc.
– Alex Harvey
Mar 7 at 11:15
I updated the question.
– Alex Harvey
Mar 7 at 11:22
How precisely does value of $$ cause different commands to be run? Are you testing whether it's odd or even? Power of 3? Prime?
– jhnc
Mar 7 at 12:05
1
Okay, think I might understand. haven't used shunit2. Couple of ideas: 1) wrap relevant assertion actual args to rewrite/filter known unknowns; 2) replace any use of $$ in code with a function that can be mocked
– jhnc
Mar 7 at 13:58
|
show 3 more comments
See here: stackoverflow.com/q/18122592/402322 and here unix.stackexchange.com/a/131635/7167
– ceving
Mar 7 at 11:12
Oh thanks. I didn't see that although it is a slightly different question and in any case I don't think suggests a way forward for what to do in a unit test. E.g. I can't assume the test environment is Linux, because it's probably Mac OS X etc.
– Alex Harvey
Mar 7 at 11:15
I updated the question.
– Alex Harvey
Mar 7 at 11:22
How precisely does value of $$ cause different commands to be run? Are you testing whether it's odd or even? Power of 3? Prime?
– jhnc
Mar 7 at 12:05
1
Okay, think I might understand. haven't used shunit2. Couple of ideas: 1) wrap relevant assertion actual args to rewrite/filter known unknowns; 2) replace any use of $$ in code with a function that can be mocked
– jhnc
Mar 7 at 13:58
See here: stackoverflow.com/q/18122592/402322 and here unix.stackexchange.com/a/131635/7167
– ceving
Mar 7 at 11:12
See here: stackoverflow.com/q/18122592/402322 and here unix.stackexchange.com/a/131635/7167
– ceving
Mar 7 at 11:12
Oh thanks. I didn't see that although it is a slightly different question and in any case I don't think suggests a way forward for what to do in a unit test. E.g. I can't assume the test environment is Linux, because it's probably Mac OS X etc.
– Alex Harvey
Mar 7 at 11:15
Oh thanks. I didn't see that although it is a slightly different question and in any case I don't think suggests a way forward for what to do in a unit test. E.g. I can't assume the test environment is Linux, because it's probably Mac OS X etc.
– Alex Harvey
Mar 7 at 11:15
I updated the question.
– Alex Harvey
Mar 7 at 11:22
I updated the question.
– Alex Harvey
Mar 7 at 11:22
How precisely does value of $$ cause different commands to be run? Are you testing whether it's odd or even? Power of 3? Prime?
– jhnc
Mar 7 at 12:05
How precisely does value of $$ cause different commands to be run? Are you testing whether it's odd or even? Power of 3? Prime?
– jhnc
Mar 7 at 12:05
1
1
Okay, think I might understand. haven't used shunit2. Couple of ideas: 1) wrap relevant assertion actual args to rewrite/filter known unknowns; 2) replace any use of $$ in code with a function that can be mocked
– jhnc
Mar 7 at 13:58
Okay, think I might understand. haven't used shunit2. Couple of ideas: 1) wrap relevant assertion actual args to rewrite/filter known unknowns; 2) replace any use of $$ in code with a function that can be mocked
– jhnc
Mar 7 at 13:58
|
show 3 more comments
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See here: stackoverflow.com/q/18122592/402322 and here unix.stackexchange.com/a/131635/7167
– ceving
Mar 7 at 11:12
Oh thanks. I didn't see that although it is a slightly different question and in any case I don't think suggests a way forward for what to do in a unit test. E.g. I can't assume the test environment is Linux, because it's probably Mac OS X etc.
– Alex Harvey
Mar 7 at 11:15
I updated the question.
– Alex Harvey
Mar 7 at 11:22
How precisely does value of $$ cause different commands to be run? Are you testing whether it's odd or even? Power of 3? Prime?
– jhnc
Mar 7 at 12:05
1
Okay, think I might understand. haven't used shunit2. Couple of ideas: 1) wrap relevant assertion actual args to rewrite/filter known unknowns; 2) replace any use of $$ in code with a function that can be mocked
– jhnc
Mar 7 at 13:58