Add Withdrawls execution tests to reference test (#5143)

Added Ethereum execution spec test to be generated and executed by reference tests gradle task. Add `https://github.com/ethereum/execution-spec-tests/releases` as custom ivy repository to easily download and cache the test specs. Updated the reference test gradle file to generate the test Java classes.

Signed-off-by: Usman Saleem <usman@usmans.info>

build.gradle

@@ -120,6 +120,21 @@ allprojects {
       content { includeGroupByRegex('com\\.splunk\\..*') }
     }
     mavenCentral()
+
+    // ethereum execution spec tests fixtures. Exclusively for ethereum submodule to run ref tests
+    def ethExecSpecTestsRepo = ivy {
+      url 'https://github.com'
+      patternLayout {
+        artifact '/[organisation]/[module]/releases/download/v[revision]/[classifier].[ext]'
+      }
+      metadataSources {
+        artifact()
+      }
+    }
+    exclusiveContent {
+      forRepositories(ethExecSpecTestsRepo)
+      filter { includeModule('ethereum', 'execution-spec-tests')}
+    }
   }
 
   dependencies { errorprone 'com.google.errorprone:error_prone_core' }

ethereum/referencetests/build.gradle

@@ -29,6 +29,37 @@ def blockchainReferenceTests = tasks.register("blockchainReferenceTests")  {
     )
 }
 
+configurations {
+  // we need this because referenceTestImplementation defaults to 'canBeResolved=false'.
+  tarConfig.extendsFrom referenceTestImplementation
+  tarConfig {
+    canBeResolved = true
+    canBeConsumed = false
+  }
+}
+
+def executionSpecTests = tasks.register("executionSpecTests") {
+  final referenceTestsPath = "$buildDir/execution-spec-tests/"
+  final generatedTestsPath = "$buildDir/generated/sources/reference-test/$name/java"
+  def tarPath = configurations.tarConfig.files.find{ it.name.startsWith('execution-spec-tests')}
+
+  copy {
+    from tarTree(tarPath)
+    into "$referenceTestsPath"
+  }
+
+  inputs.files fileTree(referenceTestsPath), fileTree(generatedTestsPath)
+  outputs.files generatedTestsPath
+  generateTestFiles(
+    fileTree(referenceTestsPath + "/fixtures"),
+    file("src/reference-test/templates/BlockchainReferenceTest.java.template"),
+    "fixtures",
+    "$generatedTestsPath/org/hyperledger/besu/ethereum/vm/executionspec",
+    "ExecutionSpecTest",
+    ("fixtures/example/example") // exclude test for test filling tool
+    )
+}
+
 def generalstateReferenceTests = tasks.register("generalstateReferenceTests")  {
   final referenceTestsPath = "src/reference-test/external-resources/GeneralStateTests"
   final generatedTestsPath = "$buildDir/generated/sources/reference-test/$name/java"
@@ -66,13 +97,15 @@ sourceSets {
       runtimeClasspath += main.output
       srcDirs "src/reference-test/java",
         blockchainReferenceTests,
+        executionSpecTests,
         generalstateReferenceTests,
         generalstateRegressionReferenceTests
     }
     resources {
       srcDirs 'src/reference-test/resources',
         'src/reference-test/external-resources',
-        'src/reference-test/templates'
+        'src/reference-test/templates',
+        'build/execution-spec-tests/'
     }
   }
 }
@@ -100,6 +133,8 @@ dependencies {
   referenceTestImplementation project(path: ':evm')
   referenceTestImplementation project(path: ':testutil')
   referenceTestImplementation project(path: ':util')
+  // the following will be resolved via custom ivy repository declared in root build.gradle
+  referenceTestImplementation 'ethereum:execution-spec-tests:0.2.3:fixtures@tar.gz'
   referenceTestImplementation 'com.fasterxml.jackson.core:jackson-databind'
   referenceTestImplementation 'com.google.guava:guava'
   referenceTestImplementation 'org.apache.tuweni:tuweni-bytes'

gradle/verification-metadata.xml

@@ -1599,6 +1599,11 @@
             <sha256 value="771e7b7e796577b0525f3121ee3101905037ee761a6a62b3a2b931f45d1c7d94" origin="Generated by Gradle"/>
          </artifact>
       </component>
+      <component group="ethereum" name="execution-spec-tests" version="0.2.3">
+         <artifact name="execution-spec-tests-0.2.3-fixtures.tar.gz">
+            <sha256 value="3dcf5c33adddec2655f85ea2912da294fc0ea210cb1dd032b5278d78a5a0d805" origin="Generated by Gradle"/>
+         </artifact>
+      </component>
       <component group="info.picocli" name="picocli" version="3.0.0">
          <artifact name="picocli-3.0.0.jar">
             <sha256 value="22dbbe287dd0ab9d4d519ac9f2dd909537b6daf279ac5962a3bad8c9dae61032" origin="Generated by Gradle"/>