Jenkins Groovy postbuild script can't access injected environment variables - build

Question

I'm trying to get a Groovy script that runs as a post-build step in a Jenkins job to access an injected variable but it keeps getting null.
I've kept the job as simple as possible so there are only 2 real bits of configuration to consider.
Here's how the property is injected. I could use other methods but this is intended for a more complicated job that reads in external properties.
This is the Groovy script I have so far. It will do something else with the value once it gets it.
This is the logging from running the job.
I'm not a Groovy expert and I've searched and tried a number of things but without success.

Answer 1

Of course having posted a question I then got the answer myself...
New script:
New logging:

Answer 2

I was able to set the value of the variable in Jenkins and access them in Slack notifications using the below script in Groovy PostBuild:
import hudson.model.*
import hudson.EnvVars
manager.listener.logger.println("======Search Log=======");
def total_tests_count=0
def total_pass_count = 0
def total_failed_count = 0
def total_skipped_count=0
def myVar
def envVar
def newEnv
def matcher = manager.getLogMatcher(".*Tests Summary(.*)\$")
if(matcher?.matches()) {
// manager.addShortText(matcher.group(1), "grey", "white", "0px", "white")
manager.listener.logger.println("matcher-0=== "+matcher.group(0));
manager.listener.logger.println("matcher-1 ====== "+matcher.group(1));
int total_start = matcher.group(1).indexOf("Total:")
total_tests_count = matcher.group(1).split('Total:')[1].split('Passed:')[0]
manager.listener.logger.println("extracted total_tests_count : ${total_tests_count}")
// Sets env var for total_tests_count
TOTAL_TESTS_COUNT=0
myVar = total_tests_count;
envVar = new EnvVars([TOTAL_TESTS_COUNT: myVar]);
newEnv = Environment.create(envVar);
manager.build.environments.add(0, newEnv);
int passed_start = matcher.group(1).indexOf("Passed:")
total_pass_count = matcher.group(1).split('Passed:')[1].split('Failed:')[0]
manager.listener.logger.println("extracted total_pass_count : ${total_pass_count}")
// Sets env var for total_pass_count
TOTAL_PASS_COUNT=0
myVar = total_pass_count;
envVar = new EnvVars([TOTAL_PASS_COUNT: myVar]);
newEnv = Environment.create(envVar);
manager.build.environments.add(1, newEnv);
int failed_start = matcher.group(1).indexOf("Failed:")
total_failed_count = matcher.group(1).split('Failed:')[1].split('Skipped:')[0]
manager.listener.logger.println("extracted total_failed_count : ${total_failed_count}" )
// Sets env var for total_failed_count
TOTAL_FAILED_COUNT=0
myVar = total_failed_count;
envVar = new EnvVars([TOTAL_FAILED_COUNT: myVar]);
newEnv = Environment.create(envVar);
manager.build.environments.add(2, newEnv);
int skipped_start = matcher.group(1).indexOf("Skipped:")
total_skipped_count = matcher.group(1).split('Skipped:')[1]
manager.listener.logger.println("extracted total_skipped_count : ${total_skipped_count}")
// Sets env var for total_skipped_count
TOTAL_SKIPPED_COUNT=0
myVar = total_skipped_count;
envVar = new EnvVars([TOTAL_SKIPPED_COUNT: myVar]);
newEnv = Environment.create(envVar);
manager.build.environments.add(3, newEnv);
}
In Jenkins, I was able to access using custom message:
Please check below url for test automation output for PR build
Total Cases: $TOTAL_TESTS_COUNT, Passed:$TOTAL_PASS_COUNT, Failed: $TOTAL_FAILED_COUNT, Skipped: $TOTAL_SKIPPED_COUNT.