Test Decoding of Nested Arrays of Enums

Tests/XMLCoderTests/NestedChoiceArrayTest.swift

@@ -0,0 +1,96 @@
+//
+//  NestedChoiceArrayTest.swift
+//  XMLCoder
+//
+//  Created by Benjamin Wetherfield on 8/22/19.
+//
+
+import XCTest
+@testable import XMLCoder
+
+private struct Book: Decodable {
+    let title: String
+    let chapters: Chapters
+
+    enum CodingKeys: String, CodingKey {
+        case title
+        case chapters
+    }
+}
+
+private struct Chapters {
+    let items: [Chapter]
+}
+
+extension Chapters: Decodable, Equatable {
+    init(from decoder: Decoder) throws {
+        let container = try decoder.singleValueContainer()
+        items = try container.decode([Chapter].self)
+    }
+}
+
+private enum Chapter {
+    struct Content {
+        let title: String
+        let content: String
+    }
+
+    case intro(Content)
+    case body(Content)
+    case outro(Content)
+}
+
+extension Chapter: Decodable {
+    enum CodingKeys: String, XMLChoiceCodingKey {
+        case intro, body = "chapter", outro
+    }
+
+    init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        do {
+            self = .body(try container.decode(Content.self, forKey: .body))
+        } catch {
+            do {
+                self = .intro(try container.decode(Content.self, forKey: .intro))
+            } catch {
+                self = .outro(try container.decode(Content.self, forKey: .outro))
+            }
+        }
+    }
+}
+
+extension Chapter.Content: Decodable {
+    enum CodingKeys: String, CodingKey {
+        case title
+        case content = ""
+    }
+}
+
+extension Book: Equatable {}
+extension Chapter: Equatable {}
+extension Chapter.Content: Equatable {}
+
+class NestedChoiceArrayTest: XCTestCase {
+    func testDecodingNestedChoiceArray() throws {
+        let xml = """
+        <?xml version="1.0" encoding="UTF-8"?>
+        <book title="Example">
+            <chapters>
+                <intro title="Intro">Content of first chapter</intro>
+                <chapter title="Chapter 1">Content of chapter 1</chapter>
+                <chapter title="Chapter 2">Content of chapter 2</chapter>
+                <outro title="Epilogue">Content of last chapter</outro>
+            </chapters>
+        </book>
+        """
+        let decoded = try XMLDecoder().decode(Book.self, from: xml.data(using: .utf8)!)
+        let expected = Book(title: "Example",
+                            chapters: Chapters(items: [
+                                .intro(.init(title: "Intro", content: "Content of first chapter")),
+                                .body(.init(title: "Chapter 1", content: "Content of chapter 1")),
+                                .body(.init(title: "Chapter 2", content: "Content of chapter 2")),
+                                .outro(.init(title: "Epilogue", content: "Content of last chapter")),
+                            ]))
+        XCTAssertEqual(decoded, expected)
+    }
+}

XMLCoder.xcodeproj/project.pbxproj

@@ -21,6 +21,7 @@
 /* End PBXAggregateTarget section */
 
 /* Begin PBXBuildFile section */
+		B5EA3BB6230F237800D8D69B /* NestedChoiceArrayTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5EA3BB4230F235C00D8D69B /* NestedChoiceArrayTest.swift */; };
 		B5F74472233F74E400BBDB15 /* RootLevelAttributeTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5F74471233F74E400BBDB15 /* RootLevelAttributeTest.swift */; };
 		OBJ_148 /* BoolBox.swift in Sources */ = {isa = PBXBuildFile; fileRef = OBJ_12 /* BoolBox.swift */; };
 		OBJ_149 /* Box.swift in Sources */ = {isa = PBXBuildFile; fileRef = OBJ_13 /* Box.swift */; };
@@ -153,6 +154,7 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		B5EA3BB4230F235C00D8D69B /* NestedChoiceArrayTest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NestedChoiceArrayTest.swift; sourceTree = "<group>"; };
 		B5F74471233F74E400BBDB15 /* RootLevelAttributeTest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RootLevelAttributeTest.swift; sourceTree = "<group>"; };
 		OBJ_100 /* DecimalTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DecimalTests.swift; sourceTree = "<group>"; };
 		OBJ_101 /* EmptyTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EmptyTests.swift; sourceTree = "<group>"; };
@@ -448,6 +450,7 @@
 				OBJ_125 /* SimpleChoiceTests.swift */,
 				OBJ_126 /* SingleChildTests.swift */,
 				OBJ_127 /* SpacePreserveTest.swift */,
+				B5EA3BB4230F235C00D8D69B /* NestedChoiceArrayTest.swift */,
 				B5F74471233F74E400BBDB15 /* RootLevelAttributeTest.swift */,
 			);
 			name = XMLCoderTests;
@@ -721,6 +724,7 @@
 				OBJ_252 /* NullTests.swift in Sources */,
 				OBJ_253 /* OptionalTests.swift in Sources */,
 				OBJ_254 /* StringTests.swift in Sources */,
+				B5EA3BB6230F237800D8D69B /* NestedChoiceArrayTest.swift in Sources */,
 				OBJ_255 /* UIntTests.swift in Sources */,
 				OBJ_256 /* URLTests.swift in Sources */,
 				OBJ_257 /* UnkeyedIntTests.swift in Sources */,

XMLCoder.xcodeproj/xcshareddata/xcbaselines/XMLCoder::XMLCoderTests.xcbaseline/76E090BF-7AFE-4988-A06A-3C423396A4A4.plist

@@ -61,7 +61,7 @@
 				<key>com.apple.XCTPerformanceMetric_WallClockTime</key>
 				<dict>
 					<key>baselineAverage</key>
-					<real>0.08847</real>
+					<real>0.263</real>
 					<key>baselineIntegrationDisplayName</key>
 					<string>Local Baseline</string>
 				</dict>