Add integration test

.github/workflows/integration-test.yml

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+name: Integration tests
+
+on:
+  push:
+    branches: ["**"]
+
+concurrency:
+  group: integration-test-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  split-total: 4
+
+jobs:
+  generate-split-index-json:
+    name: Generate split indexes
+    runs-on: ubuntu-latest
+    outputs:
+      json: ${{ steps.generate.outputs.split-index-json }}
+    steps:
+      - name: Checkout split-tests-java-action
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+
+      - name: Generate split index list
+        id: generate
+        uses: ./generate-split-index-json
+        with:
+          split-total: ${{ env.split-total }}
+
+  integration-test:
+    name: "Test #${{ matrix.split-index }}"
+    runs-on: ubuntu-latest
+    needs:
+      - generate-split-index-json
+    permissions:
+      contents: read
+      checks: write
+    strategy:
+      fail-fast: false
+      matrix:
+        split-index: ${{ fromjson(needs.generate-split-index-json.outputs.json) }}
+    env:
+      DOWNLOAD_JAR: false
+      JAR_PATH: split-tests-java/build/libs/split-tests-java.jar
+    steps:
+      - name: Checkout split-tests-java-action
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+
+      - name: Checkout split-tests-java
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          repository: Donnerbart/split-tests-java
+          path: split-tests-java
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@3a4f6e1af504cf6a31855fa899c6aa5355ba6c12 # v4
+        with:
+          distribution: temurin
+          java-version: 21
+
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@94baf225fe0a508e581a564467443d0e2379123b # v4
+
+      - name: Compile split-tests-java
+        working-directory: split-tests-java
+        run: ./gradlew shadowJar
+
+      - name: Split tests
+        id: split-tests
+        uses: ./
+        with:
+          split-index: ${{ matrix.split-index }}
+          split-total: ${{ env.split-total }}
+          glob: '**/integration-test/tests/*Test.java'
+          exclude-glob: '**/NoClassNameTest.java'
+          junit-glob: '**/integration-test/reports/*.xml'
+          format: 'list'
+          new-test-time: 'average'
+          calculate-optimal-total-split: true
+          debug: true
+
+      - name: Assert split tests
+        env:
+          SPLIT_INDEX: ${{ matrix.split-index }}
+          ACTUAL: ${{ steps.split-tests.outputs.test-suite }}
+        run: |
+          case "$SPLIT_INDEX" in
+            "0")
+            EXPECTED="de.donnerbart.example.SlowestTest"
+            ;;
+            "1")
+            EXPECTED="NoPackageTest de.donnerbart.example.ThirdPartyLibraryTest"
+            ;;
+            "2")
+            EXPECTED="de.donnerbart.example.NoTimingOneTest de.donnerbart.example.WhitespaceClassDefinitionTest"
+            ;;
+            "3")
+            EXPECTED="de.donnerbart.example.NoTimingTwoTest de.donnerbart.example.SlowTest de.donnerbart.example.FastTest"
+            ;;
+            *)
+            echo "Unexpected split index"
+            exit 1
+            ;;
+          esac
+          echo "Expected: $EXPECTED"
+          echo "Actual: $ACTUAL"
+          if [ "$ACTUAL" != "$EXPECTED" ]; then
+            echo "The split tests are not matching"
+            exit 1
+          fi

README.md

@@ -1,3 +1,6 @@
+[![Integration tests](https://github.com/Donnerbart/split-tests-java-action/actions/workflows/integration-test.yml/badge.svg)](https://github.com/Donnerbart/split-tests-java-action/actions/workflows/integration-test.yml)
+[![Release](https://github.com/Donnerbart/split-tests-java-action/actions/workflows/release.yml/badge.svg)](https://github.com/Donnerbart/split-tests-java-action/actions/workflows/release.yml)
+
 # @donnerbart/split-tests-java-action
 
 Divides a test suite into groups with equal execution time, based on prior test timings.

integration-test/reports/TEST-de.donnerbart.example.DeletedTest.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<testsuite name="de.donnerbart.example.DeletedTest" tests="1" skipped="0" failures="0" errors="0"
+           timestamp="2025-01-01T00:00:00" hostname="example" time="2.374">
+    <properties/>
+    <testcase name="testDeletedMethod()"
+              classname="de.donnerbart.example.DeletedTest" time="2.374"/>
+    <system-out><![CDATA[]]></system-out>
+    <system-err><![CDATA[]]></system-err>
+</testsuite>

integration-test/reports/TEST-de.donnerbart.example.FastTest.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<testsuite name="de.donnerbart.example.FastTest" tests="1" skipped="0" failures="0" errors="0"
+           timestamp="2025-01-01T00:00:00" hostname="example" time="2.374">
+    <properties/>
+    <testcase name="testFastMethod()"
+              classname="de.donnerbart.example.FastTest" time="2.374"/>
+    <system-out><![CDATA[]]></system-out>
+    <system-err><![CDATA[]]></system-err>
+</testsuite>

integration-test/reports/TEST-de.donnerbart.example.SlowTest.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<testsuite name="de.donnerbart.example.SlowTest" tests="1" skipped="0" failures="0" errors="0"
+           timestamp="2025-01-01T00:00:00" hostname="example" time="12.386">
+    <properties/>
+    <testcase name="testFastMethod()"
+              classname="de.donnerbart.example.SlowTest" time="12.386"/>
+    <system-out><![CDATA[]]></system-out>
+    <system-err><![CDATA[]]></system-err>
+</testsuite>

integration-test/reports/TEST-de.donnerbart.example.SlowestTest.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<testsuite name="de.donnerbart.example.SlowestTest" tests="1" skipped="0" failures="0" errors="0"
+           timestamp="2025-01-01T00:00:00" hostname="example" time="153.457">
+    <properties/>
+    <testcase name="testFastMethod()"
+              classname="de.donnerbart.example.SlowestTest" time="153.457"/>
+    <system-out><![CDATA[]]></system-out>
+    <system-err><![CDATA[]]></system-err>
+</testsuite>

integration-test/tests/AbstractTest.java

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+package de.donnerbart.example;
+
+abstract class AbstractTest {
+
+    abstract void implementableMethod();
+}

integration-test/tests/BaseTest.java

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+package de.donnerbart.example;
+
+abstract class BaseTest {
+
+    abstract void implementableMethod();
+}

integration-test/tests/DisabledTest.java

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+package de.donnerbart.example;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+@Disabled("This test should be skipped")
+class DisabledTest {
+
+    @Test
+    void testDisabled() {
+    }
+}

integration-test/tests/FastTest.java

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+package de.donnerbart.example;
+
+import org.junit.jupiter.api.Test;
+
+class FastTest {
+
+    @Test
+    void testFastMethod() {
+    }
+}

integration-test/tests/IgnoreTest.java

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+package de.donnerbart.example;
+
+import org.junit.Ignore;
+import org.junit.Test;
+
+@Ignore("This test should be skipped")
+class IgnoreTest {
+
+    @Test
+    void testIgnored() {
+    }
+}

integration-test/tests/InterfaceTest.java

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+package de.donnerbart.example;
+
+interface BaseTest {
+
+    void implementableMethod();
+}

integration-test/tests/NoClassNameTest.java

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+package de.donnerbart.example;
+
+record NoClassNameTest(String foo) {
+}

integration-test/tests/NoPackageTest.java

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+class NoPackageTest {
+}

integration-test/tests/NoTimingOneTest.java

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+package de.donnerbart.example;
+
+import org.junit.jupiter.api.Test;
+
+class NoTimingOneTest {
+
+    @Test
+    void testNoTimingMethod() {
+    }
+}

integration-test/tests/NoTimingTwoTest.java

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+package de.donnerbart.example;
+
+import org.junit.jupiter.api.Test;
+
+class NoTimingTwoTest {
+
+    @Test
+    void testNoTimingMethod() {
+    }
+}

integration-test/tests/SlowTest.java

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+package de.donnerbart.example;
+
+import org.junit.jupiter.api.Test;
+
+class SlowTest {
+
+    @Test
+    void testSlowMethod() {
+    }
+}

integration-test/tests/SlowestTest.java

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+package de.donnerbart.example;
+
+import org.junit.jupiter.api.Test;
+
+class SlowestTest {
+
+    @Test
+    void testSlowestMethod() {
+    }
+}

integration-test/tests/ThirdPartyLibraryTest.java

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+package de.donnerbart.example;
+
+import com.example.test.Util;
+import org.junit.jupiter.api.Test;
+
+class ThirdPartyLibraryTest {
+
+    @Test
+    void testThirdPartyLibraryMethod() {
+        Util.test();
+    }
+}

integration-test/tests/WhitespaceClassDefinitionTest.java

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+//@formatter:off
+package     de.donnerbart.example
+        ;
+
+import org.junit.jupiter.api.Test;
+
+class   WhitespaceClassDefinitionTest
+        extends FastTest {
+
+    @Test
+    void testFastMethod() {
+    }
+}
+//@formatter:on