feat: add tests for Category

Author: htmlprogrammist

Example App/EmojiPicker.xcworkspace/xcuserdata/egbad.xcuserdatad/UserInterfaceState.xcuserstate

@@ -35,7 +35,7 @@ protocol EmojiManagerProtocol {
 /// The class is responsible for getting a relevant set of emojis for iOS version.
 final class EmojiManager: EmojiManagerProtocol {
 
-    // MARK: - Private
+    // MARK: - Private Properties
 
     private let decoder = JSONDecoder()
     /// Version of emoji set.

Example App/Pods/Pods.xcodeproj/project.pbxproj

@@ -19,8 +19,6 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-import Foundation
-
 /// Protocol for a ViewModel which is being used in `EmojiPickerViewController`.
 protocol EmojiPickerViewModelProtocol {
     /// The observed variable that is responsible for the choice of emoji.
@@ -70,7 +68,7 @@ final class EmojiPickerViewModel: EmojiPickerViewModelProtocol {
 
     func emoji(at indexPath: IndexPath) -> String {
         let name = emojiSet.categories[indexPath.section].emojis[indexPath.row]
-        return emojiSet.emojis[name]?.skins[0].native ?? ""
+        return emojiSet.emojis[name]?.skins[0].native ?? "❗️"
     }
 
     func sectionHeaderViewModel(for section: Int) -> String {

Sources/EmojiPicker/Services/EmojiManager.swift

@@ -0,0 +1,81 @@
+//
+//  CategoryTests.swift
+//  EmojiPicker-Unit-Tests
+//
+//  Created by Егор Бадмаев on 25.01.2023.
+//
+
+import XCTest
+@testable import EmojiPicker
+
+class CategoryTests: XCTestCase {
+    
+    var category: EmojiPicker.Category!
+    
+    override func tearDownWithError() throws {
+        category = nil
+    }
+    
+    func test_decodeCategory_success() throws {
+        let result = try? JSONDecoder().decode(EmojiPicker.Category.self, from: category1)
+        
+        XCTAssertNotNil(result)
+        XCTAssertEqual(result?.emojis, ["grinning", "smiley", "smile"])
+    }
+    
+    func test_decodeCategory_arraySuccess() throws {
+        let result = try? JSONDecoder().decode([EmojiPicker.Category].self, from: category3)
+        
+        XCTAssertNotNil(result)
+        XCTAssertEqual(result?.count, 2)
+    }
+    
+    func test_decodeCategory_wrongCodingKeys() throws {
+        let result = try? JSONDecoder().decode(EmojiPicker.Category.self, from: category2)
+        
+        XCTAssertNil(result)
+    }
+}
+
+fileprivate let category1 = Data("""
+{
+    "id": "people",
+    "emojis": [
+        "grinning",
+        "smiley",
+        "smile",
+    ]
+}
+""".utf8)
+
+fileprivate let category2 = Data("""
+{
+    "type": "people",
+    "emojis": [
+        "grinning",
+        "smiley",
+        "smile",
+    ]
+}
+""".utf8)
+
+fileprivate let category3 = Data("""
+[
+    {
+      "id": "people",
+      "emojis": [
+        "grinning",
+        "smile",
+        "zzz"
+      ]
+    },
+    {
+      "id": "nature",
+      "emojis": [
+        "monkey",
+        "leaves",
+        "dog"
+      ]
+    }
+]
+""".utf8)