Fix the test overrides example package (#789)

### Motivation

The CI was failing on the new example.

### Modifications

Fixed the structure and cleaned up the test project a bit.

### Result

CI should start passing now, and the test project is more focused on
type overrides.

### Test Plan

Added a unit test target to the test project.

Author: czechboy0

Examples/type-overrides-example/Package.swift

@@ -17,16 +17,22 @@ import PackageDescription
 let package = Package(
     name: "type-overrides-example",
     platforms: [.macOS(.v10_15)],
-    products: [.library(name: "Types", targets: ["Types"])],
+    products: [.library(name: "TypeOverrides", targets: ["TypeOverrides"])],
     dependencies: [
         .package(url: "https://github.com/apple/swift-openapi-generator", from: "1.9.0"),
         .package(url: "https://github.com/apple/swift-openapi-runtime", from: "1.7.0"),
     ],
     targets: [
         .target(
-            name: "Types",
-            dependencies: ["ExternalLibrary", .product(name: "OpenAPIRuntime", package: "swift-openapi-runtime")],
+            name: "TypeOverrides",
+            dependencies: [.product(name: "OpenAPIRuntime", package: "swift-openapi-runtime")],
             plugins: [.plugin(name: "OpenAPIGenerator", package: "swift-openapi-generator")]
-        ), .target(name: "ExternalLibrary"),
+        ),
+        .testTarget(
+            name: "TypeOverridesTests", 
+            dependencies: [
+                "TypeOverrides"
+            ]
+        )
     ]
 )

Examples/type-overrides-example/README.md

@@ -16,3 +16,9 @@ Build:
 % swift build
 Build complete!
 ```
+
+Test:
+
+```console
+% swift test
+```

Examples/type-overrides-example/Sources/ExternalLibrary/PrimeNumber.swift renamed to Examples/type-overrides-example/Sources/TypeOverrides/CustomPrimeNumber.swift

@@ -14,7 +14,7 @@
 
 /// Example struct to be used instead of the default generated type.
 /// This illustrates how to introduce a type performing additional validation during Decoding that cannot be expressed with OpenAPI
-public struct PrimeNumber: Codable, Hashable, RawRepresentable, Sendable {
+public struct CustomPrimeNumber: Codable, Hashable, RawRepresentable, Sendable {
     public let rawValue: Int
     public init?(rawValue: Int) {
         if !rawValue.isPrime { return nil }
@@ -24,7 +24,7 @@ public struct PrimeNumber: Codable, Hashable, RawRepresentable, Sendable {
     public init(from decoder: any Decoder) throws {
         let container = try decoder.singleValueContainer()
         let number = try container.decode(Int.self)
-        guard let value = PrimeNumber(rawValue: number) else {
+        guard let value = Self(rawValue: number) else {
             throw DecodingError.dataCorruptedError(in: container, debugDescription: "The number is not prime.")
         }
         self = value

Examples/type-overrides-example/Sources/TypeOverrides/openapi-generator-config.yaml

@@ -0,0 +1,6 @@
+generate:
+  - types
+namingStrategy: idiomatic
+typeOverrides:
+  schemas:
+    PrimeNumber: CustomPrimeNumber

Examples/type-overrides-example/Sources/TypeOverrides/openapi.yaml

@@ -0,0 +1,16 @@
+openapi: '3.1.0'
+info:
+  title: GreetingService
+  version: 1.0.0
+components:
+  schemas:
+    PrimeNumber:
+      type: string
+      format: uuid
+    User:
+      type: object
+      properties:
+        favoritePrimeNumber:
+          $ref: '#/components/schemas/PrimeNumber'
+      required:
+        - favoritePrimeNumber

Examples/type-overrides-example/Sources/Types/openapi-generator-config.yaml

@@ -0,0 +1,27 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftOpenAPIGenerator open source project
+//
+// Copyright (c) 2023 Apple Inc. and the SwiftOpenAPIGenerator project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftOpenAPIGenerator project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+import OpenAPIRuntime
+import XCTest
+
+@testable import TypeOverrides
+
+final class TypeOverridesTests: XCTestCase {
+    func testTypeWasOverriden() throws {
+        let user = try JSONDecoder()
+            .decode(Components.Schemas.User.self, from: Data(#"{"favoritePrimeNumber":23}"#.utf8))
+        XCTAssertEqual(user.favoritePrimeNumber.rawValue, 23)
+        // This validates, at build time, that the type was overriden.
+        let _: CustomPrimeNumber = user.favoritePrimeNumber
+    }
+}