Add transport version generation task (#132772)

build-tools-internal/src/integTest/groovy/org/elasticsearch/gradle/internal/transport/AbstractTransportVersionFuncTest.groovy

@@ -14,6 +14,7 @@ import org.gradle.testkit.runner.BuildResult
 import org.gradle.testkit.runner.TaskOutcome
 
 class AbstractTransportVersionFuncTest extends AbstractGradleFuncTest {
+
     def javaResource(String project, String path, String content) {
         file("${project}/src/main/resources/${path}").withWriter { writer ->
             writer << content
@@ -45,10 +46,18 @@ class AbstractTransportVersionFuncTest extends AbstractGradleFuncTest {
         return referableAndReferencedTransportVersion(name, ids, "Test${name.capitalize()}")
     }
 
-    def referableAndReferencedTransportVersion(String name, String ids, String classname) {
+    def referencedTransportVersion(String name) {
+        referencedTransportVersion(name, "Test${name.capitalize()}")
+    }
+
+    def referencedTransportVersion(String name, String classname) {
         javaSource("myserver", "org.elasticsearch", classname, "", """
             static final TransportVersion usage = TransportVersion.fromName("${name}");
         """)
+    }
+
+    def referableAndReferencedTransportVersion(String name, String ids, String classname) {
+        referencedTransportVersion(name, classname)
         referableTransportVersion(name, ids)
     }
 
@@ -74,6 +83,20 @@ class AbstractTransportVersionFuncTest extends AbstractGradleFuncTest {
         assertOutputContains(result.output, expectedOutput)
     }
 
+    void assertReferableDefinition(String name, String content) {
+        File definitionFile = file("myserver/src/main/resources/transport/definitions/referable/${name}.csv")
+        assert definitionFile.exists()
+        assert definitionFile.text.strip() == content
+    }
+
+    void assertReferableDefinitionDoesNotExist(String name) {
+        assert file("myserver/src/main/resources/transport/definitions/referable/${name}.csv").exists() == false
+    }
+
+    void assertUpperBound(String name, String content) {
+        assert file("myserver/src/main/resources/transport/upper_bounds/${name}.csv").text.strip() == content
+    }
+
     def setup() {
         configurationCacheCompatible = false
         internalBuild()
@@ -86,12 +109,17 @@ class AbstractTransportVersionFuncTest extends AbstractGradleFuncTest {
             apply plugin: 'java-library'
             apply plugin: 'elasticsearch.transport-version-references'
             apply plugin: 'elasticsearch.transport-version-resources'
+
+            tasks.named('generateTransportVersionDefinition') {
+                currentUpperBoundName = '9.2'
+            }
         """
         referableTransportVersion("existing_91", "8012000")
         referableTransportVersion("existing_92", "8123000,8012001")
         unreferableTransportVersion("initial_9_0_0", "8000000")
         transportVersionUpperBound("9.2", "existing_92", "8123000")
         transportVersionUpperBound("9.1", "existing_92", "8012001")
+        transportVersionUpperBound("9.0", "initial_9_0_0", "8000000")
         // a mock version of TransportVersion, just here so we can compile Dummy.java et al
         javaSource("myserver", "org.elasticsearch", "TransportVersion", "", """
             public static TransportVersion fromName(String name) {