[kotlin] Fix boolean const enum literal generation

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractKotlinCodegen.java

@@ -1052,7 +1052,8 @@ public CodegenModel fromModel(String name, Schema schema) {
 
     @Override
     public String toEnumValue(String value, String datatype) {
-        if ("kotlin.Int".equals(datatype) || "kotlin.Long".equals(datatype)) {
+        if ("kotlin.Int".equals(datatype) || "kotlin.Long".equals(datatype)
+                || "kotlin.Boolean".equals(datatype)) {
             return value;
         } else if ("kotlin.Double".equals(datatype)) {
             if (value.contains(".")) {

modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/AbstractKotlinCodegenTest.java

@@ -172,6 +172,7 @@ public void toEnumValue() {
         assertEquals(codegen.toEnumValue("1", "kotlin.Double"), "1.0");
         assertEquals(codegen.toEnumValue("1.3", "kotlin.Double"), "1.3");
         assertEquals(codegen.toEnumValue("1337", "kotlin.Long"), "1337");
+        assertEquals(codegen.toEnumValue("true", "kotlin.Boolean"), "true");
         assertEquals(codegen.toEnumValue("5", "kotlin.Float"), "5f");
         assertEquals(codegen.toEnumValue("1.0", "kotlin.Float"), "1.0f");
         assertEquals(codegen.toEnumValue("data", "Something"), "\"data\"");

modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/KotlinClientCodegenModelTest.java

@@ -818,6 +818,36 @@ public void testIntArrayToEnum() throws IOException {
       TestUtils.assertFileContains(modelKt, "enum class DaysOfWeek(val value: kotlin.Int)");
   }
 
+  @Test
+  public void testBooleanConstEnumUsesBooleanLiteral() throws IOException {
+      File output = Files.createTempDirectory("test").toFile();
+      output.deleteOnExit();
+
+      final CodegenConfigurator configurator = new CodegenConfigurator()
+              .setGeneratorName("kotlin")
+              .setLibrary("jvm-ktor")
+              .setAdditionalProperties(new HashMap<>() {{
+                put(CodegenConstants.SERIALIZATION_LIBRARY, "jackson");
+                put(CodegenConstants.MODEL_PACKAGE, "model");
+                put(ENUM_PROPERTY_NAMING, "original");
+              }})
+              .setInputSpec("src/test/resources/3_1/kotlin/issue23550-boolean-const.yaml")
+              .setOutputDir(output.getAbsolutePath().replace("\\", "/"));
+
+      final ClientOptInput clientOptInput = configurator.toClientOptInput();
+      DefaultGenerator generator = new DefaultGenerator();
+
+      generator.opts(clientOptInput).generate();
+
+      final Path modelKt = Paths.get(output + "/src/main/kotlin/model/ExceptionState.kt");
+
+      TestUtils.assertFileContains(modelKt,
+              "enum class ExceptionPeriodIsClosed(val value: kotlin.Boolean)",
+              "@JsonProperty(value = \"true\")",
+              "`true`(true);");
+      TestUtils.assertFileNotContains(modelKt, "`true`(\"true\")");
+  }
+
   @Test
   public void testJacksonEnumsUseJsonCreator() throws IOException {
       File output = Files.createTempDirectory("test").toFile();

modules/openapi-generator/src/test/resources/3_1/kotlin/issue23550-boolean-const.yaml

@@ -0,0 +1,13 @@
+openapi: 3.1.0
+info:
+  title: Boolean const regression
+  version: 1.0.0
+paths: {}
+components:
+  schemas:
+    ExceptionState:
+      type: object
+      properties:
+        exceptionPeriodIsClosed:
+          type: boolean
+          const: true