Agent skill
jacoco
Check JaCoCo code coverage for jhelm modules
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/jacoco
SKILL.md
Check JaCoCo Code Coverage
Run verify to generate coverage reports, then parse and display results.
Minimum threshold: 80% line coverage
Step 1: Generate coverage reports
Specific module (e.g., /jacoco jhelm-core):
./mvnw verify -pl $ARGUMENTS -q
All modules:
./mvnw verify -q
Step 2: Module-level summary
Shows coverage percentage per module with PASS/FAIL status:
python3 -c "
import xml.etree.ElementTree as ET
THRESHOLD = 80
modules = ['jhelm-gotemplate', 'jhelm-core', 'jhelm-app']
if '$ARGUMENTS':
modules = ['$ARGUMENTS']
print(f'{'Module':<20} {'Covered':>8} {'Total':>8} {'Coverage':>10} {'Status':>8}')
print('-' * 58)
for module in modules:
try:
tree = ET.parse(f'{module}/target/site/jacoco/jacoco.xml')
root = tree.getroot()
for counter in root.findall('counter'):
if counter.get('type') == 'LINE':
missed = int(counter.get('missed'))
covered = int(counter.get('covered'))
total = missed + covered
pct = covered / total * 100 if total > 0 else 0
status = 'PASS' if pct >= THRESHOLD else 'FAIL'
print(f'{module:<20} {covered:>8} {total:>8} {pct:>9.2f}% {status:>8}')
except FileNotFoundError:
print(f'{module:<20} {'N/A':>8} {'N/A':>8} {'N/A':>10} {'MISSING':>8}')
"
Step 3: Class-level breakdown (lowest coverage first)
Find classes with lowest coverage to target improvements:
python3 -c "
import xml.etree.ElementTree as ET
module = '$ARGUMENTS' if '$ARGUMENTS' else 'jhelm-gotemplate'
tree = ET.parse(f'{module}/target/site/jacoco/jacoco.xml')
root = tree.getroot()
results = []
for pkg in root.findall('.//package'):
for cls in pkg.findall('class'):
for counter in cls.findall('counter'):
if counter.get('type') == 'LINE':
missed = int(counter.get('missed'))
covered = int(counter.get('covered'))
total = missed + covered
if total > 0:
pct = covered / total * 100
results.append((pct, missed, covered, total, cls.get('name')))
results.sort()
print(f'{'Coverage':>10} {'Missed':>8} {'Covered':>8} {'Total':>8} Class')
print('-' * 80)
for pct, missed, covered, total, name in results:
print(f'{pct:>9.1f}% {missed:>8} {covered:>8} {total:>8} {name}')
"
Step 4: Uncovered lines in a specific class
Find exact line numbers not covered (for targeted test writing):
python3 -c "
import xml.etree.ElementTree as ET
module = '$ARGUMENTS' if '$ARGUMENTS' else 'jhelm-gotemplate'
tree = ET.parse(f'{module}/target/site/jacoco/jacoco.xml')
root = tree.getroot()
# Change CLASS_NAME to the target class source file
CLASS_NAME = 'REPLACE_ME.java'
for pkg in root.findall('.//package'):
for sf in pkg.findall('sourcefile'):
if sf.get('name') == CLASS_NAME:
uncovered = []
for line in sf.findall('line'):
mi = int(line.get('mi', 0))
if mi > 0:
uncovered.append(int(line.get('nr')))
print(f'Uncovered lines in {CLASS_NAME}: {len(uncovered)} lines')
for ln in uncovered:
print(f' Line {ln}')
"
Step 5: Gap analysis (how many lines needed to reach threshold)
Calculate exactly how many more lines need coverage:
python3 -c "
import xml.etree.ElementTree as ET
import math
THRESHOLD = 80
modules = ['jhelm-gotemplate', 'jhelm-core', 'jhelm-app']
if '$ARGUMENTS':
modules = ['$ARGUMENTS']
for module in modules:
try:
tree = ET.parse(f'{module}/target/site/jacoco/jacoco.xml')
root = tree.getroot()
for counter in root.findall('counter'):
if counter.get('type') == 'LINE':
missed = int(counter.get('missed'))
covered = int(counter.get('covered'))
total = missed + covered
pct = covered / total * 100 if total > 0 else 0
needed = math.ceil(THRESHOLD / 100 * total) - covered
if needed > 0:
print(f'{module}: {pct:.2f}% — need {needed} more lines covered to reach {THRESHOLD}%')
else:
print(f'{module}: {pct:.2f}% — ALREADY above {THRESHOLD}% (surplus: {-needed} lines)')
except FileNotFoundError:
print(f'{module}: No coverage report found')
"
Step 6: Quick-win targets (classes with small gaps)
Find classes where a few lines of coverage make the biggest impact:
python3 -c "
import xml.etree.ElementTree as ET
module = '$ARGUMENTS' if '$ARGUMENTS' else 'jhelm-gotemplate'
tree = ET.parse(f'{module}/target/site/jacoco/jacoco.xml')
root = tree.getroot()
results = []
for pkg in root.findall('.//package'):
for cls in pkg.findall('class'):
for counter in cls.findall('counter'):
if counter.get('type') == 'LINE':
missed = int(counter.get('missed'))
covered = int(counter.get('covered'))
total = missed + covered
if total > 0 and missed > 0:
results.append((missed, covered, total, cls.get('name')))
# Sort by fewest missed lines first (quick wins)
results.sort(key=lambda x: x[0])
print(f'{'Missed':>8} {'Covered':>8} {'Total':>8} {'Coverage':>10} Class')
print('-' * 80)
for missed, covered, total, name in results[:20]:
pct = covered / total * 100
print(f'{missed:>8} {covered:>8} {total:>8} {pct:>9.1f}% {name}')
"
Step 7: Full summary report
Complete report with all counter types (LINE, BRANCH, METHOD, CLASS):
python3 -c "
import xml.etree.ElementTree as ET
modules = ['jhelm-gotemplate', 'jhelm-core', 'jhelm-app']
if '$ARGUMENTS':
modules = ['$ARGUMENTS']
for module in modules:
try:
tree = ET.parse(f'{module}/target/site/jacoco/jacoco.xml')
root = tree.getroot()
print(f'\n=== {module} ===')
print(f'{'Type':<12} {'Covered':>8} {'Missed':>8} {'Total':>8} {'Coverage':>10}')
print('-' * 50)
for counter in root.findall('counter'):
ctype = counter.get('type')
missed = int(counter.get('missed'))
covered = int(counter.get('covered'))
total = missed + covered
pct = covered / total * 100 if total > 0 else 0
print(f'{ctype:<12} {covered:>8} {missed:>8} {total:>8} {pct:>9.2f}%')
except FileNotFoundError:
print(f'\n=== {module} === NO REPORT FOUND')
"
Coverage improvement strategy
When coverage is below 80%:
- Run gap analysis (Step 5) to see how many lines are needed
- Run quick-win targets (Step 6) to find classes with fewest missed lines
- Run uncovered lines (Step 4) on those classes to find exact lines
- Write tests targeting those lines:
- Use
@ParameterizedTestto efficiently cover multiple code paths - Use Mockito for external dependencies (KubeService, RepoManager, etc.)
- Focus on error/exception paths which are often uncovered
- Use
- Re-run verify and summary to confirm improvement
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