Build on latest Java, test through lowest possible

.github/workflows/gradle-latest-versions.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-java@v3
         with:
-          java-version: 11
+          java-version: 19
           distribution: 'zulu'
       - uses: gradle/gradle-build-action@v2
 

.github/workflows/java-versions.yml

@@ -15,14 +15,14 @@ jobs:
   openjdk:
     strategy:
       matrix:
-        jdk: [11, 17]
+        jdk: [8, 11, 17]
     name: "OpenJDK ${{ matrix.jdk }}"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-java@v3
         with:
-          java-version: ${{ matrix.jdk }}
+          java-version: 19
           distribution: 'zulu'
       - uses: gradle/gradle-build-action@v2
       # Workaround https://github.com/ajoberstar/gradle-stutter/issues/22
@@ -32,8 +32,8 @@ jobs:
           # java11=6.0.1,6.9.4,7.0.2,7.6.1,8.0.2,8.1.1,8.2-rc-1
           # ->
           # java11=8.2-rc-1
-          # The trick is that \2 will greedily eat everything before the last comma.
-          sed -r 's/^(.*?)=(.*),(.*)$/\1=\3/g' -i stutter.lockfile
+          # The trick is that \3 will greedily eat everything before the last comma.
+          sed -r 's/^(.*?)=(.*?),(.*),(.*?)$/\1=\2,\4/g' -i stutter.lockfile
           cat stutter.lockfile
       - name: Test cross Java versions compatibility
         run: |

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions/setup-java@v3
       with:
-        java-version: 11
+        java-version: 19
         distribution: 'zulu'
     - uses: gradle/gradle-build-action@v2
       with:

build.gradle.kts

@@ -90,9 +90,7 @@ dependencies {
     testImplementation("com.github.tomakehurst:wiremock:2.27.2")
     testImplementation("ru.lanwen.wiremock:wiremock-junit5:1.3.1")
     testImplementation("org.assertj:assertj-core:3.24.2")
-    // This cannot be updated to 5.x as it requires Java 11,
-    // but we are running CI on Java 8 in .github/workflows/java-versions.yml.
-    testImplementation("org.mockito:mockito-junit-jupiter:4.11.0")
+    testImplementation("org.mockito:mockito-junit-jupiter:5.4.0")
     testImplementation("com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0")
 }
 
@@ -260,6 +258,11 @@ tasks {
     withType<Test>().matching { it.name.startsWith("compatTest") }.configureEach {
         systemProperty("plugin.version", project.version)
     }
+    named<Test>("test").configure {
+        javaLauncher = project.javaToolchains.launcherFor {
+            languageVersion = JavaLanguageVersion.of(11)
+        }
+    }
 }
 
 publishing {

buildSrc/src/main/kotlin/IdeaExtExtensions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018 the original author or authors.
+ * Copyright 2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,13 +24,13 @@ import java.io.File
 import kotlin.math.min
 
 fun IdeaProject.settings(configuration: ProjectSettings.() -> kotlin.Unit) =
-        (this as ExtensionAware).configure(configuration)
+    (this as ExtensionAware).configure(configuration)
 
 fun ProjectSettings.copyright(configuration: CopyrightConfiguration.() -> kotlin.Unit) =
-        (this as ExtensionAware).configure(configuration)
+    (this as ExtensionAware).configure(configuration)
 
 fun Project.readCopyrightHeader(licenseHeaderFile: File) =
-        licenseHeaderFile.readLines()
-                .map { line -> line.substring(min(line.length, 3)) }
-                .joinToString("\n")
-                .trim()
+    licenseHeaderFile.readLines()
+        .map { line -> line.substring(min(line.length, 3)) }
+        .joinToString("\n")
+        .trim()