test: Add test coverage for JsonSchemaConverter property handling

Co-authored-by: Oleksandr Klymenko <[email protected]>
Signed-off-by: Oleksandr Klymenko <[email protected]>

Author: alxkm

models/spring-ai-google-genai/src/test/java/org/springframework/ai/google/genai/schema/JsonSchemaConverterTests.java

@@ -74,6 +74,51 @@ void fromJsonShouldHandleNullInput() {
 		assertThatThrownBy(() -> JsonSchemaConverter.fromJson(null)).isInstanceOf(RuntimeException.class);
 	}
 
+	@Test
+	void shouldHandleBooleanAdditionalProperties() {
+		String json = """
+				{
+					"type": "object",
+					"additionalProperties": true
+				}
+				""";
+		ObjectNode result = JsonSchemaConverter.convertToOpenApiSchema(JsonSchemaConverter.fromJson(json));
+		assertThat(result.get("additionalProperties").asBoolean()).isTrue();
+	}
+
+	@Test
+	void shouldHandleEnumProperty() {
+		String json = """
+				{
+					"type": "string",
+					"enum": ["a", "b", "c"]
+				}
+				""";
+		ObjectNode result = JsonSchemaConverter.convertToOpenApiSchema(JsonSchemaConverter.fromJson(json));
+		assertThat(result.get("enum")).isNotNull();
+		assertThat(result.get("enum").get(0).asText()).isEqualTo("a");
+		assertThat(result.get("enum").get(1).asText()).isEqualTo("b");
+		assertThat(result.get("enum").get(2).asText()).isEqualTo("c");
+	}
+
+	@Test
+	void shouldHandleOpenApiSpecificProperties() {
+		String json = """
+				{
+					"type": "string",
+					"nullable": true,
+					"readOnly": true,
+					"writeOnly": false,
+					"description": {"propertyName": "type"}
+				}
+				""";
+		ObjectNode result = JsonSchemaConverter.convertToOpenApiSchema(JsonSchemaConverter.fromJson(json));
+		assertThat(result.get("nullable").asBoolean()).isTrue();
+		assertThat(result.get("readOnly").asBoolean()).isTrue();
+		assertThat(result.get("writeOnly").asBoolean()).isFalse();
+		assertThat(result.get("description").get("propertyName").asText()).isEqualTo("type");
+	}
+
 	@Nested
 	class SchemaConversionTests {