Add tests to verify java versions on CI

.github/workflows/java-versions.yml

@@ -14,6 +14,7 @@ on:
 jobs:
   openjdk:
     strategy:
+      fail-fast: false
       matrix:
         jdk: [8, 11, 17]
     name: "OpenJDK ${{ matrix.jdk }}"

.github/workflows/main.yml

@@ -14,6 +14,7 @@ on:
 jobs:
   gradle:
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}

src/compatTest/kotlin/io/github/gradlenexus/publishplugin/JavaVersionInCompatTest.kt

@@ -0,0 +1,11 @@
+package io.github.gradlenexus.publishplugin
+
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.fail
+
+class JavaVersionInCompatTest {
+
+    @Test fun test() {
+        fail(System.getProperty("java.version").toString())
+    }
+}

src/e2eTest/kotlin/io/github/gradlenexus/publishplugin/e2e/JavaVersionInE2ETest.kt

@@ -0,0 +1,11 @@
+package io.github.gradlenexus.publishplugin.e2e
+
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.fail
+
+class JavaVersionInE2ETest {
+
+    @Test fun test() {
+        fail(System.getProperty("java.version").toString())
+    }
+}

src/test/kotlin/io/github/gradlenexus/publishplugin/JavaVersionUnitTest.kt

@@ -0,0 +1,11 @@
+package io.github.gradlenexus.publishplugin
+
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.fail
+
+class JavaVersionUnitTest {
+
+    @Test fun test() {
+        fail(System.getProperty("java.version").toString())
+    }
+}