Starting plugin tests on core coordinates : MavenCoordinates[groupId=org.jenkins-ci.plugins, artifactId=plugin, version=2.176.3]
Plugin ace-editor not in included plugins => test skipped !
...
Plugin git-server not in included plugins => test skipped !
Jan 27, 2020 4:45:35 PM org.jenkins.tools.test.model.PluginRemoting retrievePomData
INFO: 
    org.jenkins-ci.plugins.icon-shim
    icon-shim-pom
    1.0.3
    ../
  
Jan 27, 2020 4:45:35 PM org.jenkins.tools.test.PluginCompatTester testPlugins
INFO: Detected parent POM: org.jenkins-ci.plugins.icon-shim:icon-shim-pom:1.0.3

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##
## Starting to test plugin icon-shim v1.0.3
## against MavenCoordinates[groupId=org.jenkins-ci.plugins, artifactId=plugin, version=2.176.3]
##
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Processing org.jenkins.tools.test.hook.BlueOceanHook
Hook not triggered.  Continuing.
Processing org.jenkins.tools.test.hook.SwarmHook
Hook not triggered.  Continuing.
Processing org.jenkins.tools.test.hook.DeclarativePipelineHook
Hook not triggered.  Continuing.
Processing org.jenkins.tools.test.hook.StructsHook
Hook not triggered.  Continuing.
Processing org.jenkins.tools.test.hook.PipelineRestApiHook
Hook not triggered.  Continuing.
Processing org.jenkins.tools.test.hook.ConfigurationAsCodeHook
Hook not triggered.  Continuing.
Created plugin checkout dir : /home/jenkins/workspace/Tools_bom_PR-179/pct-work/icon-shim
POM did not provide an SCM tag. Inferring tag 'icon-shim-1.0.3'.
Checking out from SCM connection URL : scm:git:git://github.com/jenkinsci/icon-shim-plugin.git (icon-shim-1.0.3) at tag icon-shim-1.0.3
[INFO] Executing: /bin/sh -c cd '/home/jenkins/workspace/Tools_bom_PR-179/pct-work' && 'git' 'clone' 'git://github.com/jenkinsci/icon-shim-plugin.git' '/home/jenkins/workspace/Tools_bom_PR-179/pct-work/icon-shim'
[INFO] Working directory: /home/jenkins/workspace/Tools_bom_PR-179/pct-work
[INFO] Executing: /bin/sh -c cd '/home/jenkins/workspace/Tools_bom_PR-179/pct-work/icon-shim' && 'git' 'fetch' 'git://github.com/jenkinsci/icon-shim-plugin.git'
[INFO] Working directory: /home/jenkins/workspace/Tools_bom_PR-179/pct-work/icon-shim
[INFO] Executing: /bin/sh -c cd '/home/jenkins/workspace/Tools_bom_PR-179/pct-work/icon-shim' && 'git' 'checkout' 'icon-shim-1.0.3'
[INFO] Working directory: /home/jenkins/workspace/Tools_bom_PR-179/pct-work/icon-shim
Error : The git-checkout command failed. || Cloning into '/home/jenkins/workspace/Tools_bom_PR-179/pct-work/icon-shim'...
From git://github.com/jenkinsci/icon-shim-plugin
 * branch            HEAD       -> FETCH_HEAD
error: pathspec 'icon-shim-1.0.3' did not match any file(s) known to git

Jan 27, 2020 4:45:36 PM org.jenkins.tools.test.PluginCompatTester testPlugins
SEVERE: Internal error while executing a test for core 2.176.3 and plugin icon-shim 1.0.3. Please submit a bug to plugin-compat-tester
org.jenkins.tools.test.exception.PluginSourcesUnavailableException: Problem while checking out plugin sources!
	at org.jenkins.tools.test.PluginCompatTester.testPluginAgainst(PluginCompatTester.java:471)
	at org.jenkins.tools.test.PluginCompatTester.testPlugins(PluginCompatTester.java:300)
	at org.jenkins.tools.test.PluginCompatTesterCli.main(PluginCompatTesterCli.java:163)
Caused by: java.lang.RuntimeException: The git-checkout command failed. || Cloning into '/home/jenkins/workspace/Tools_bom_PR-179/pct-work/icon-shim'...
From git://github.com/jenkinsci/icon-shim-plugin
 * branch            HEAD       -> FETCH_HEAD
error: pathspec 'icon-shim-1.0.3' did not match any file(s) known to git

	at org.jenkins.tools.test.PluginCompatTester.cloneFromSCM(PluginCompatTester.java:562)
	at org.jenkins.tools.test.PluginCompatTester.testPluginAgainst(PluginCompatTester.java:457)
	... 2 more

Plugin jackson2-api not in included plugins => test skipped !
...