Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
[ERROR] Failed to execute goal on project maven-compiler-plugin: Could not resolve dependencies for project org.apache.maven.plugins:maven-compiler-plugin:maven-plugin:3.12.1
[ERROR] dependency: org.mockito:mockito-core:jar:4.8.0 (test)
A test dependency specified in the POM file could not be resolved by Maven.