plz

.gitea/workflows/ci.yml

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+name: CI / Gradle
+on:
+  push:
+    branches: [ "main" ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+      - name: Run Checkstyle
+        run: ./gradlew checkstyleMain
+      - name: Run tests with coverage
+        run: ./gradlew test jacocoTestReport
+      - name: Build project
+        run: ./gradlew build

.gitignore

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+.gradle/
+gradle-8.10/
+build/
+.gradle/
+gradle/
+gradlew
+gradlew.bat

build.gradle

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+plugins {
+    id 'java'
+    id 'application'
+    id 'checkstyle'
+    id 'jacoco'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.10.0'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+}
+
+application {
+    mainClass = 'com.example.App'
+}
+
+test {
+    useJUnitPlatform()
+    finalizedBy jacocoTestReport
+}
+
+jacocoTestReport {
+    dependsOn test
+    reports {
+        xml.required = true
+        html.required = true
+    }
+}
+
+checkstyle {
+    toolVersion = '10.12.0'
+    configFile = file('config/checkstyle/checkstyle.xml')
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}

config/checkstyle/checkstyle.xml

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+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+    "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+    "https://checkstyle.org/dtds/configuration_1_3.dtd">
+<module name="Checker">
+    <module name="TreeWalker">
+        <module name="Indentation"/>
+        <module name="WhitespaceAfter"/>
+    </module>
+</module>

settings.gradle

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+rootProject.name = 'my-app'

src/main/java/com/example/App.java

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+package com.example;
+
+public class App {
+    public static int add(int a, int b) { return a + b; }
+    public static int sub(int a, int b) { return a - b; }
+    public static int mul(int a, int b) { return a * b; }
+
+    public static void main(String[] args) {
+        System.out.println("CI ready");
+        System.out.println("2 + 3 = " + add(2, 3));
+    }
+}

src/test/java/com/example/AppTest.java

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+package com.example;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class AppTest {
+    @Test void testAdd() { assertEquals(5, App.add(2, 3)); }
+    @Test void testSub() { assertEquals(1, App.sub(3, 2)); }
+    @Test void testMul() { assertEquals(6, App.mul(2, 3)); }
+}