Implemented the Outdated subcommand (#6)

This PR contains the work done to implement the `Outdated` subcommand that check for outdated package dependencies in a *Hummingbird* project.

Reviewed-on: #6
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Test/Sources/Cases/Internal/Extensions/URL+ExtensionsTests.swift

@@ -24,8 +24,8 @@ struct URL_ExtensionsTests {
 
     // MARK: Computed tests
     
-    @Test(arguments: zip([URL.someFile, .dotFile, .tildeFile, .someURL],
-                         [String.someFilePath, .dotPath, .tildePath, .empty]))
+    @Test(arguments: zip([URL.someFile, .dotFile, .tildeFile, .someEncodedFile, .someURL],
+                         [String.someFilePath, .dotPath, .tildePath, .someEncodedPath, .empty]))
     func pathString(
         with url: URL,
         expects path: String
@@ -63,6 +63,7 @@ private extension String {
     static let dotPath = "."
     static let empty = ""
     static let tildePath = "~"
+    static let someEncodedPath = "/sömê/páth/fîlê"
     static let someFilePath = "/some/file/path"
 }
 
@@ -70,6 +71,7 @@ private extension String {
 
 private extension URL {
     static let dotFile = URL(at: .dotPath)
+    static let someEncodedFile = URL(at: "/sömê/páth/fîlê")
     static let someFile = URL(at: .someFilePath)
     static let someURL = URL(string: "https://some.url.path")!
     static let tildeFile = URL(at: .tildePath)

Test/Sources/Cases/Public/Tasks/OutdatedDependenciesTaskTests.swift

@@ -0,0 +1,42 @@
+import Foundation
+import Testing
+
+@testable import ColibriLibrary
+
+struct OutdatedDependenciesTaskTests {
+    
+    @Test(arguments: [nil, URL.someCurrentFolder])
+    func task(at location: URL?) async throws {
+        // GIVEN
+        let terminalService = TerminalServiceSpy()
+        let task = OutdatedDependenciesTask(terminalService: terminalService)
+        
+        // WHEN
+        try await task(at: location)
+        
+        // THEN
+        let executableURL = URL(at: "/usr/bin/swift")
+        let arguments = if let location {
+            ["package", "update", "--package-path", location.pathString, "--dry-run"]
+        } else {
+            ["package", "update", "--dry-run"]
+        }
+        
+        #expect(terminalService.actions.count == 1)
+        #expect(terminalService.actions[0] == .ran(executableURL, arguments))
+    }
+    
+    @Test(arguments: [nil, URL.someCurrentFolder], [TerminalServiceError.unexpected, .output(""), .captured("")])
+    func task(at location: URL?, throws error: TerminalServiceError) async throws {
+        // GIVEN
+        let terminalService = TerminalServiceMock(action: .error(error))
+        let task = BuildProjectTask(terminalService: terminalService)
+        
+        // WHEN
+        // THEN
+        await #expect(throws: error) {
+            try await task(at: location)
+        }
+    }
+    
+}