Merge pull request #3 from gonzalezreal/empty-dictionary

Add EmptyDictionary default value provider

Author: gonzalezreal

README.md

@@ -73,6 +73,9 @@ protocol DefaultValueProvider {
 ### `Empty`
 It provides an empty instance of a `String`, `Array` or any type that implements `RangeReplaceableCollection`.
 
+### `EmptyDictionary`
+It provides an empty instance of a `Dictionary`.
+
 ### `True` and `False`
 Provide `true` and `false` respectively for `Bool` properties.
 

Sources/DefaultCodable/DefaultValueProvider.swift

@@ -18,6 +18,10 @@ public enum Empty<A>: DefaultValueProvider where A: Codable, A: Equatable, A: Ra
     public static var `default`: A { A() }
 }
 
+public enum EmptyDictionary<K, V>: DefaultValueProvider where K: Hashable & Codable, V: Equatable & Codable {
+    public static var `default`: [K: V] { Dictionary() }
+}
+
 public enum FirstCase<A>: DefaultValueProvider where A: Codable, A: Equatable, A: CaseIterable {
     public static var `default`: A { A.allCases.first! }
 }

Tests/DefaultCodableTests/DefaultTests.swift

@@ -9,21 +9,23 @@ final class DefaultTests: XCTestCase {
     private struct Thing: Codable, Equatable {
         var name: String
 
-        @Default<Empty>
-        var description: String
-
-        @Default<True>
-        var isFoo: Bool
-
-        @Default<FirstCase>
-        var type: ThingType
-
-        @Default<ZeroDouble>
-        var floatingPoint: Double
-
-        init(name: String, description: String = "", isFoo: Bool = true, type: ThingType = .foo, floatingPoint: Double = 0) {
+        @Default<Empty> var description: String
+        @Default<EmptyDictionary> var entities: [String: String]
+        @Default<True> var isFoo: Bool
+        @Default<FirstCase> var type: ThingType
+        @Default<ZeroDouble> var floatingPoint: Double
+
+        init(
+            name: String,
+            description: String = "",
+            entities: [String: String] = [:],
+            isFoo: Bool = true,
+            type: ThingType = .foo,
+            floatingPoint: Double = 0
+        ) {
             self.name = name
             self.description = description
+            self.entities = entities
             self.isFoo = isFoo
             self.type = type
             self.floatingPoint = floatingPoint
@@ -36,6 +38,9 @@ final class DefaultTests: XCTestCase {
         {
           "name": "Any name",
           "description": "Any description",
+          "entities": {
+            "foo": "bar"
+          },
           "isFoo": false,
           "type": "baz",
           "floatingPoint": 12.34
@@ -47,6 +52,7 @@ final class DefaultTests: XCTestCase {
 
         // then
         XCTAssertEqual("Any description", result.description)
+        XCTAssertEqual(["foo": "bar"], result.entities)
         XCTAssertFalse(result.isFoo)
         XCTAssertEqual(ThingType.baz, result.type)
         XCTAssertEqual(result.floatingPoint, 12.34)
@@ -58,6 +64,7 @@ final class DefaultTests: XCTestCase {
         {
           "name": "Any name",
           "description": null,
+          "entities": null,
           "isFoo": null,
           "type": null,
           "floatingPoint": null
@@ -69,6 +76,7 @@ final class DefaultTests: XCTestCase {
 
         // then
         XCTAssertEqual("", result.description)
+        XCTAssertEqual([:], result.entities)
         XCTAssertTrue(result.isFoo)
         XCTAssertEqual(ThingType.foo, result.type)
         XCTAssertEqual(result.floatingPoint, 0)
@@ -87,6 +95,7 @@ final class DefaultTests: XCTestCase {
 
         // then
         XCTAssertEqual("", result.description)
+        XCTAssertEqual([:], result.entities)
         XCTAssertTrue(result.isFoo)
         XCTAssertEqual(ThingType.foo, result.type)
         XCTAssertEqual(result.floatingPoint, 0)
@@ -111,10 +120,20 @@ final class DefaultTests: XCTestCase {
     @available(OSX 10.13, iOS 11.0, watchOS 4.0, tvOS 11.0, *)
     func testValueEncodesToActualValue() throws {
         // given
-        let thing = Thing(name: "Any name", description: "Any description", isFoo: false, type: .baz, floatingPoint: 12.34)
+        let thing = Thing(
+            name: "Any name",
+            description: "Any description",
+            entities: ["foo": "bar"],
+            isFoo: false,
+            type: .baz,
+            floatingPoint: 12.34
+        )
         let expected = """
         {
           "description" : "Any description",
+          "entities" : {
+            "foo" : "bar"
+          },
           "floatingPoint" : 12.34,
           "isFoo" : false,
           "name" : "Any name",