add tests for openApiGenerate task with configuration cache support

Author: Picazsoo

modules/openapi-generator-gradle-plugin/src/test/kotlin/GenerateTaskConfigurationCacheTest.kt

@@ -63,6 +63,49 @@ class GenerateTaskConfigurationCacheTest : TestBase() {
         assertEquals(expectedRelativeFilePathSet, projectDirCC.toRelativeFilePathSet())
     }
 
+    @Test(dataProvider = "gradle_version_provider")
+    fun `openApiGenerate should handle up-to-date with configuration cache`(gradleVersion: String, format: String) {
+        val propertyFormat = PropertyFormat.valueOf(format)
+        // Arrange
+        withProject(inputSpecExtensionContents(propertyFormat))
+
+        // Act - First run: Should be SUCCESS and store the configuration cache
+        val result1 = build {
+            withProjectDir(projectDirCC)
+            withArguments("--configuration-cache", "openApiGenerate")
+            withGradleVersion(gradleVersion)
+        }
+
+        // Assert first run
+        assertEquals(TaskOutcome.SUCCESS, result1.task(":openApiGenerate")?.outcome)
+        assertTrue(result1.output.contains("Configuration cache entry stored."))
+
+        // Act - Second run: Should be UP-TO-DATE and reuse the cache
+        val result2 = build {
+            withProjectDir(projectDirCC)
+            withArguments("--configuration-cache", "openApiGenerate")
+            withGradleVersion(gradleVersion)
+        }
+
+        // Assert second run
+        assertEquals(TaskOutcome.UP_TO_DATE, result2.task(":openApiGenerate")?.outcome)
+        assertTrue(result2.output.contains("Configuration cache entry reused."))
+
+        // Act - Third run: Modify spec file and task should re-execute
+        val specFile = projectDirCC.resolve("spec.yaml")
+        specFile.appendText("\n# Trigger change")
+
+        val result3 = build {
+            withProjectDir(projectDirCC)
+            withArguments("--configuration-cache", "openApiGenerate")
+            withGradleVersion(gradleVersion)
+        }
+
+        // Assert third run
+        assertEquals(TaskOutcome.SUCCESS, result3.task(":openApiGenerate")?.outcome)
+        assertTrue(result3.output.contains("Configuration cache entry reused."))
+    }
+
     private fun getJavaVersion(): Int {
         val version = System.getProperty("java.version")
         val parts = version.split('.')

modules/openapi-generator-gradle-plugin/src/test/kotlin/TestBase.kt

@@ -7,31 +7,6 @@ import java.io.File
 import java.io.InputStream
 import java.nio.file.Files.createTempDirectory
 
-/**
- * Defines how file/directory properties are referenced in Gradle build scripts.
- * - STRING: Uses .absolutePath (e.g., file("spec.yaml").absolutePath)
- * - FILE: Uses direct file() reference (e.g., file("spec.yaml"))
- *
- * Note: File format tests only run with the newest Gradle version (8.7) for performance.
- * All properties in a single test use the same format (no mixing).
- */
-enum class PropertyFormat {
-    STRING,
-    FILE
-}
-
-/**
- * Converts a file path to a Gradle property reference based on format.
- * @param format The property format to use
- * @return Formatted property value (either file("path").absolutePath or file("path"))
- */
-fun String.toPropertyReference(format: PropertyFormat): String {
-    return when (format) {
-        PropertyFormat.STRING -> """file("$this").absolutePath"""
-        PropertyFormat.FILE -> """file("$this")"""
-    }
-}
-
 abstract class TestBase {
     protected open lateinit var temp: File
 
@@ -74,4 +49,29 @@ abstract class TestBase {
             .forwardOutput()
             .apply(configure)
             .build()!!
+}
+
+/**
+ * Defines how file/directory properties are referenced in Gradle build scripts.
+ * - STRING: Uses .absolutePath (e.g., file("spec.yaml").absolutePath)
+ * - FILE: Uses direct file() reference (e.g., file("spec.yaml"))
+ *
+ * Note: File format tests only run with the newest Gradle version (8.7) for performance.
+ * All properties in a single test use the same format (no mixing).
+ */
+enum class PropertyFormat {
+    STRING,
+    FILE
+}
+
+/**
+ * Converts a file path to a Gradle property reference based on format.
+ * @param format The property format to use
+ * @return Formatted property value (either file("path").absolutePath or file("path"))
+ */
+fun String.toPropertyReference(format: PropertyFormat): String {
+    return when (format) {
+        PropertyFormat.STRING -> """file("$this").absolutePath"""
+        PropertyFormat.FILE -> """file("$this")"""
+    }
 }