Implemented the AgentNameValidationRule type in the library target.

Tests/DiscogsService/Cases/Internal/Use Cases/ValidateInputUseCaseTests.swift

@@ -22,6 +22,20 @@ struct ValidateInputUseCaseTests {
     // MARK: Functions
     
 #if swift(>=6.2)
+    @Test(arguments: zip(
+        Input.inputsAgentName,
+        Output.inputsAgentName
+    )) func `validate agent name`(
+        input: String,
+        expects error: InputValidationError?
+    ) async throws {
+        try assertValidate(
+            rule: .agentName,
+            input: input,
+            expects: error
+        )
+    }
+
     @Test(arguments: zip(
         Input.inputsNotEmpty,
         Output.inputsNotEmpty
@@ -92,6 +106,20 @@ struct ValidateInputUseCaseTests {
         )
     }
 #else
+    @Test("validate agent name", arguments: zip(
+        Input.inputsAgentName,
+        Output.inputsAgentName
+    )) func validateAgentName(
+        input: String,
+        expects error: InputValidationError?
+    ) async throws {
+        try assertValidate(
+            rule: .agentName,
+            input: input,
+            expects: error
+        )
+    }
+
     @Test("validate not empty", arguments: zip(
         Input.inputsNotEmpty,
         Output.inputsNotEmpty
@@ -203,6 +231,8 @@ private extension ValidateInputUseCaseTests {
 // MARK: - Constants
 
 private extension Input {
+    /// A list of inputs to validate against a user agent name validation rule.
+    static let inputsAgentName: [String] = ["SampleApp", "Sample4pp", "SampleApp1", "SampleApp🚀", "Sample App", "Sample-App", "Sample_App"]
     /// A list of inputs to validate against the not empty validation rule.
     static let inputsNotEmpty: [String] = ["Something", .empty]
     /// A list of inputs to validate against the not nil validation rule.
@@ -216,6 +246,8 @@ private extension Input {
 }
 
 private extension Output {
+    /// A list of expected input validation errors to be thrown after validating inputs against the user agent name validation rule.
+    static let inputsAgentName: [InputValidationError?] = [nil, nil, nil, .inputNotAgentName, .inputNotAgentName, .inputNotAgentName, .inputNotAgentName]
     /// A list of expected input validation errors to be thrown after validating inputs against the not empty validation rule.
     static let inputsNotEmpty: [InputValidationError?] = [nil, .inputIsEmpty]
     /// A list of expected input validation errors to be thrown after validating inputs against the not nil validation rule.