Coverage Question

[xmq-111]

When I use JQF-2.1 to test James-3.8.1, I encounter a situation where the coverage information is 0.
`Semantic Fuzzing with Zest

Test name: org.apache.james.jmap.draft.methods.SetMessagesCreationProcessorTest#assertUserCanSendFromShouldThrowWhenSenderIsNotTheConnectedUser
Instrumentation: Janala
Results directory: /home/xmq/Downloads/james-project-3.8.1-source-release/james-project/server/protocols/jmap-draft/target/fuzz-results/org.apache.james.jmap.draft.methods.SetMessagesCreationProcessorTest/assertUserCanSendFromShouldThrowWhenSenderIsNotTheConnectedUser
Elapsed time: 3s (max 10s)
Number of executions: 95,009 (no trial limit)
Valid inputs: 0 (0.00%)
Cycles completed: 0
Unique failures: 3
Queue size: 0 (0 favored last cycle)
Current parent input:
Execution speed: 31,971/sec now | 25,595/sec overall
Total coverage: 0 branches (0.00% of map)
Valid coverage: 0 branches (0.00% of map)
Fuzzing stopped due to guidance exception: Too many trials without coverage; likely all assumption violations
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.520 s
[INFO] Finished at: 2024-12-28T15:00:57+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal edu.berkeley.cs.jqf:jqf-maven-plugin:2.1-SNAPSHOT:fuzz (default-cli) on project james-server-jmap-draft: Internal error: Too many trials without coverage; likely all assumption violations -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
`

[rohanpadhye]

You can see the error message: Too many trials without coverage; likely all assumption violations and 3 unique failures in the status screen. You likely have assumeTrue() statements where the predicate is always false (i.e., no randomly generated input is satisfying the predicate) or some assumption in your input generator that is never true.

You can debug by running mvn jqf:repro with the input files saved in the failures directory, and seeing what the error stack trace looks like. Maybe also add some print statements at the start of your test method to see what your inputs look like in order to debug the issue.