Check that all issues that this one is blocked by are resolved. You might want to put this on the Resolve Issue transition.

import com.atlassian.jira.component.ComponentAccessor

def linkType = ["Blocks"]

def linkMgr = ComponentAccessor.getIssueLinkManager()
for (IssueLink link in linkMgr.getInwardLinks( {
    if (linkType.contains( {
        if (!link.sourceObject.resolutionId) {
            passesCondition = false


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