Add github action to run tests and get coverages

.github/workflows/test.yml

@@ -0,0 +1,47 @@
+name: Test
+
+on:
+  push:
+  pull_request:
+
+env:
+  JAVA_DIST: 'zulu'
+  JAVA_VERSION: 22
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  test:
+    name: Compile and Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: ${{ env.JAVA_DIST }}
+          java-version: ${{ env.JAVA_VERSION }}
+          cache: 'maven'
+      - name: Build and Test
+        run: >
+          xvfb-run
+          mvn -B verify -Djavafx.platform=linux
+          jacoco:report
+          -Pcoverage
+      - name: Get JaCoCo Coverage
+        id: coverage  
+        run: |
+          coverage=$(python3 config/coverage.py target/site/jacoco/jacoco.csv) 
+          echo "COVERAGE=$coverage" >> $GITHUB_ENV
+
+      - name: Fail if coverage has not improved.
+        run: |
+          coverage=$COVERAGE
+          threshold=13.43
+          if (( $(echo "$coverage <= $threshold" | bc -l) )); then
+            echo "Coverage has not improved."
+            exit 1
+          else
+            echo "New coverage: $coverage%"
+          fi

config/coverage.py

@@ -0,0 +1,47 @@
+import csv
+
+def computeCoverage(fileList):
+    """Parses one or more jacoco.csv files and computes code coverage percentages."""
+    missed = 0
+    covered = 0
+    missedBranches = 0
+    coveredBranches = 0
+
+    for filename in fileList:
+        try:
+            with open(filename, newline='') as csvfile:
+                jacocoReader = csv.reader(csvfile)
+                for i, row in enumerate(jacocoReader):
+                    if i > 0:  # Skip header
+                        missed += int(row[3])
+                        covered += int(row[4])
+                        missedBranches += int(row[5])
+                        coveredBranches += int(row[6])
+        except FileNotFoundError:
+            print(f"File not found: {filename}")
+            return (0, 0)
+        except Exception as e:
+            print(f"Error processing file {filename}: {str(e)}")
+            return (0, 0)
+
+    return (
+        calculatePercentage(covered, missed),
+        calculatePercentage(coveredBranches, missedBranches)
+    )
+
+def calculatePercentage(covered, missed):
+    """Calculates the coverage percentage."""
+    if missed == 0 and covered == 0:
+        return 1
+    return covered / (covered + missed)
+
+def main(jacocoCsvFile):
+    coverage, branchCoverage = computeCoverage([jacocoCsvFile])
+    """Return coverage percentage to check against the previous coverage."""
+    return round(coverage * 100, 2)
+
+if __name__ == "__main__":
+    import sys
+    jacocoCsvFile = sys.argv[1]
+    result = main(jacocoCsvFile)
+    print(result)

pom.xml

@@ -353,7 +353,7 @@
 					</dependency>
 				</dependencies>
 				<configuration>
-					<argLine>--enable-preview</argLine>
+					<argLine>@{surefireArgLine} --enable-preview</argLine> 
 					<reportFormat>plain</reportFormat>
 					<consoleOutputReporter>
 						<disable>true</disable>
@@ -439,6 +439,10 @@
 								<goals>
 									<goal>prepare-agent</goal>
 								</goals>
+								<configuration>
+									<append>true</append>
+									<propertyName>surefireArgLine</propertyName>
+								</configuration>
 							</execution>
 							<execution>
 								<id>report</id>