Updated Gradle implementation

- Removed custom Gradle models
- Added standalone tests for Gradle
- Separated meta-build to generate files under mill-build

Author: ajaychandran

example/migrating/javalib/4-gradle-complete/build.mill

@@ -6,7 +6,7 @@
 > git remote add -f origin https://github.com/komamitsu/fluency.git
 > git checkout 2.7.3 # multi-module Java project that requires Java 16+
 
-> ./mill init --base-module FluencyModule --jvm-id 16
+> ./mill init
 converting Gradle build
 ...
 init completed, run "mill resolve _" to list available tasks

example/migrating/javalib/5-gradle-incomplete/build.mill

@@ -4,13 +4,12 @@
 
 > git init .
 > git remote add -f origin https://github.com/mockito/mockito.git
-> git checkout v5.15.2 # multi-module Java project that requires Java 17+
+> git checkout v5.19.0 # multi-module Java project that requires Java 17+
 
-> ./mill init --base-module MockitoModule --jvm-id 17   # init ignores custom dependency configurations
+> ./mill init # imported modules are not fully functional
 converting Gradle build
-ignoring errorprone dependency (com.google.errorprone,error_prone_core,2.23.0)
 init completed, run "mill resolve _" to list available tasks
 
-> ./mill __.compile   # compilation error can be by fixed by using the Mill plugin for ErrorProne
-error: plug-in not found: ErrorProne
+> ./mill mockito-core.compile   # requires manual tweaking to support Java modules
+error: ...module not found: net.bytebuddy
 */

integration/manual/migrating-gradle/src/MillInitEhcache3Tests.scala

@@ -0,0 +1,35 @@
+package mill.integration
+
+import mill.testkit.GitRepoIntegrationTestSuite
+import utest.*
+
+object MillInitEhcache3Tests extends GitRepoIntegrationTestSuite {
+
+  // gradle 7.2
+  // custom dependency configurations
+  // dependencies with version constraints
+  // custom layout
+  // custom repository
+  // bom dependencies
+  // modules with pom packaging
+  // Junit4
+  def gitRepoUrl = "[email protected]:ehcache/ehcache3.git"
+  def gitRepoBranch = "v3.10.8"
+
+  def tests = Tests {
+    test - integrationTest { tester =>
+      import tester.*
+
+      // https://docs.gradle.org/current/userguide/compatibility.html#java_runtime
+      os.write(workspacePath / ".mill-jvm-version", "11")
+
+      eval("init", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval(("resolve", "_"), stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval("ehcache-api.compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval("ehcache-api.test", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+
+      // custom dependency configurations not supported
+      eval("ehcache-xml.compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> false
+    }
+  }
+}

integration/manual/migrating-gradle/src/MillInitFastCsvTests.scala

@@ -0,0 +1,34 @@
+package mill.integration
+
+import mill.testkit.GitRepoIntegrationTestSuite
+import utest.*
+
+object MillInitFastCsvTests extends GitRepoIntegrationTestSuite {
+
+  // gradle 9.0.0-rc-1
+  // Junit5
+  // uses ErrorProne
+  def gitRepoUrl = "[email protected]:osiegmar/FastCSV.git"
+  def gitRepoBranch = "v4.0.0"
+
+  def tests = Tests {
+    test - integrationTest { tester =>
+      import tester.*
+
+      // from tasks.compileJava.options.release
+      os.write(workspacePath / ".mill-jvm-version", "17")
+
+      eval("init", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval(("resolve", "_"), stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval("lib.compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval("lib.publishLocal", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+
+      // requires support for Java modules
+      eval("example.compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> false
+
+      // junit-platform-launcher version is set implicitly (tasks.test.useJunitPlatform())
+      // https://docs.gradle.org/8.14.3/userguide/upgrading_version_8.html#test_framework_implementation_dependencies
+      eval("lib.test.compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> false
+    }
+  }
+}

integration/manual/migrating-gradle/src/MillInitJCommanderTests.scala

@@ -0,0 +1,29 @@
+package mill.integration
+
+import mill.testkit.GitRepoIntegrationTestSuite
+import utest.*
+
+object MillInitJCommanderTests extends GitRepoIntegrationTestSuite {
+
+  // gradle 8.9
+  // single module
+  // testng 7.0.0
+  def gitRepoUrl = "[email protected]:cbeust/jcommander.git"
+  def gitRepoBranch = "2.0"
+
+  def tests = Tests {
+    test - integrationTest { tester =>
+      import tester.*
+
+      os.write(workspacePath / ".mill-jvm-version", "11")
+
+      eval("init", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval(("resolve", "_"), stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval("compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval("publishLocal", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+
+      // annotations defined in main-module cannot be used in test-module?
+      eval("test.compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> false
+    }
+  }
+}

integration/manual/migrating-gradle/src/MillInitMicroconfigTests.scala

@@ -0,0 +1,25 @@
+package mill.integration
+
+import mill.testkit.GitRepoIntegrationTestSuite
+import utest.*
+
+object MillInitMicroconfigTests extends GitRepoIntegrationTestSuite {
+
+  // gradle 8.10.1
+  // uses spring-boot-dependencies BOM
+  // Junit5
+  def gitRepoUrl = "[email protected]:microconfig/microconfig.git"
+  def gitRepoBranch = "v4.9.5"
+
+  def tests = Tests {
+    test - integrationTest { tester =>
+      import tester.*
+
+      eval(("init", "-u"), stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval(("resolve", "_"), stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval("__.compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval("__.publishLocal", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval("__.test", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+    }
+  }
+}

integration/manual/migrating-gradle/src/MillInitMockitoTests.scala

@@ -0,0 +1,24 @@
+package mill.integration
+
+import mill.testkit.GitRepoIntegrationTestSuite
+import utest.*
+
+object MillInitMockitoTests extends GitRepoIntegrationTestSuite {
+
+  // gradle 8.14.2
+  // contains BOM module
+  def gitRepoUrl = "[email protected]:mockito/mockito.git"
+  def gitRepoBranch = "v5.19.0"
+
+  def tests = Tests {
+    test - integrationTest { tester =>
+      import tester.*
+
+      eval("init", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval(("resolve", "_"), stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+
+      // requires support for Java modules
+      eval("mockito-core.compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> false
+    }
+  }
+}

integration/manual/migrating-gradle/src/MillInitPCollectionsTests.scala

@@ -0,0 +1,25 @@
+package mill.integration
+
+import mill.testkit.GitRepoIntegrationTestSuite
+import utest.*
+
+object MillInitPCollectionsTests extends GitRepoIntegrationTestSuite {
+
+  // gradle 8.14.3
+  // single module
+  // Junit5
+  def gitRepoUrl = "[email protected]:hrldcpr/pcollections.git"
+  def gitRepoBranch = "v5.0.0"
+
+  def tests = Tests {
+    test - integrationTest { tester =>
+      import tester.*
+
+      eval("init", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval(("resolve", "_"), stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+
+      // requires non-LTS JDK9
+      eval("compile", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> false
+    }
+  }
+}

integration/manual/migrating-gradle/src/MillInitSpotbugsTests.scala

@@ -0,0 +1,37 @@
+package mill.integration
+
+import mill.testkit.GitRepoIntegrationTestSuite
+import utest.*
+
+object MillInitSpotbugsTests extends GitRepoIntegrationTestSuite {
+
+  // gradle 9.0.0
+  // custom dependency configurations
+  // dependencies with version constraints
+  // custom layout
+  // Junit5
+  def gitRepoUrl = "[email protected]:spotbugs/spotbugs.git"
+  def gitRepoBranch = "4.9.4"
+
+  def tests = Tests {
+    test - integrationTest { tester =>
+      import tester.*
+
+      eval("init", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval(("resolve", "_"), stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> true
+      eval(
+        "spotbugs-annotations.compile",
+        stdout = os.Inherit,
+        stderr = os.Inherit
+      ).isSuccess ==> true
+      eval(
+        "spotbugs-annotations.publishLocal",
+        stdout = os.Inherit,
+        stderr = os.Inherit
+      ).isSuccess ==> true
+
+      // missing sources from custom layout
+      eval("spotbugs-tests.test", stdout = os.Inherit, stderr = os.Inherit).isSuccess ==> false
+    }
+  }
+}