[Xcodeproj] Fix Plist to write in deterministic order.

 - Also, add a missing test declaration for Linux.

Author: ddunbar

Sources/Xcodeproj/Plist.swift

@@ -40,7 +40,7 @@ extension Plist {
         case .array(let items):
             return "(" + items.map { $0.serialize() }.joined(separator: ", ") + ")"
         case .dictionary(let items):
-            return "{" + items.map { " \($0) = \($1.serialize()) " }.joined(separator: "; ") + "; };"
+            return "{" + items.sorted(by: { (lhs, rhs) in lhs.0 < rhs.0 }).map { " \($0) = \($1.serialize()) " }.joined(separator: "; ") + "; };"
         }
     }
 

Tests/XcodeprojTests/PlistTests.swift

@@ -15,6 +15,10 @@ class PlistTests: XCTestCase {
     func testBasics() {
         XCTAssertEqual("\"hello \\\" world\"", Plist.string("hello \" world").serialize())
         XCTAssertEqual("(\"hello world\", \"cool\")", Plist.array([.string("hello world"), .string("cool")]).serialize())
-        XCTAssertEqual("{ user = \"cool\" ;  polo = (\"hello \\\" world\", \"cool\") ; };", Plist.dictionary(["user": .string("cool"), "polo": Plist.array([.string("hello \" world"), .string("cool")])]).serialize())
+        XCTAssertEqual("{ polo = (\"hello \\\" world\", \"cool\") ;  user = \"cool\" ; };", Plist.dictionary(["user": .string("cool"), "polo": Plist.array([.string("hello \" world"), .string("cool")])]).serialize())
     }
+
+    static var allTests = [
+        ("testBasics", testBasics),
+    ]
 }

Tests/XcodeprojTests/XCTestManifests.swift

@@ -15,6 +15,7 @@ public func allTests() -> [XCTestCaseEntry] {
     return [
         testCase(GenerateXcodeprojTests.allTests),
         testCase(FunctionalTests.allTests),
+        testCase(PlistTests.allTests),
     ]
 }
 #endif