testability

readme.md

@@ -474,6 +474,10 @@ public function execute(): int
 
 ## Testing Your Commands
 
+The CLI component provides comprehensive testing support, including the ability to test commands that require user input.
+
+### Testing Commands Without User Input
+
 ```php
 use PHPUnit\Framework\TestCase;
 use Neuron\Cli\Console\Input;
@@ -484,23 +488,155 @@ class MakeControllerCommandTest extends TestCase
     public function testExecute(): void
     {
         $command = new MakeControllerCommand();
-        
+
         // Mock input
         $input = new Input(['UserController', '--resource']);
         $output = new Output(false); // No colors for testing
-        
+
         $command->setInput($input);
         $command->setOutput($output);
         $command->configure();
         $input->parse($command);
-        
+
         $exitCode = $command->execute();
-        
+
         $this->assertEquals(0, $exitCode);
     }
 }
 ```
 
+### Testing Commands With User Input
+
+Commands that use `prompt()`, `confirm()`, `secret()`, or `choice()` can be tested using the `TestInputReader`:
+
+```php
+use PHPUnit\Framework\TestCase;
+use Neuron\Cli\Console\Input;
+use Neuron\Cli\Console\Output;
+use Neuron\Cli\IO\TestInputReader;
+
+class SetupCommandTest extends TestCase
+{
+    public function testInteractiveSetup(): void
+    {
+        $command = new SetupCommand();
+
+        // Create test input reader with pre-programmed responses
+        $inputReader = new TestInputReader();
+        $inputReader->addResponse('my-project');        // Project name
+        $inputReader->addResponse('John Doe');          // Author name
+        $inputReader->addResponse('john@example.com');  // Email
+        $inputReader->addResponse('yes');               // Confirmation
+
+        // Configure command
+        $input = new Input([]);
+        $output = new Output(false);
+
+        $command->setInput($input);
+        $command->setOutput($output);
+        $command->setInputReader($inputReader);
+
+        // Execute command
+        $exitCode = $command->execute();
+
+        // Assertions
+        $this->assertEquals(0, $exitCode);
+
+        // Verify the prompts that were shown
+        $prompts = $inputReader->getPromptHistory();
+        $this->assertCount(4, $prompts);
+        $this->assertStringContainsString('Project name', $prompts[0]);
+        $this->assertStringContainsString('Author name', $prompts[1]);
+    }
+
+    public function testUserCancelsSetup(): void
+    {
+        $command = new SetupCommand();
+
+        // User will cancel the setup
+        $inputReader = new TestInputReader();
+        $inputReader->addResponses([
+            'test-project',
+            'Test User',
+            'test@example.com',
+            'no'  // Cancel confirmation
+        ]);
+
+        $input = new Input([]);
+        $output = new Output(false);
+
+        $command->setInput($input);
+        $command->setOutput($output);
+        $command->setInputReader($inputReader);
+
+        $exitCode = $command->execute();
+
+        // Should return non-zero exit code when cancelled
+        $this->assertNotEquals(0, $exitCode);
+    }
+}
+```
+
+### Using Input Reader in Commands
+
+To make your commands testable, use the convenience methods provided by the `Command` base class:
+
+```php
+class SetupCommand extends Command
+{
+    public function execute(): int
+    {
+        // Use built-in convenience methods instead of reading STDIN directly
+        $name = $this->prompt('Enter project name: ');
+
+        if ($this->confirm('Enable caching?', true)) {
+            // User confirmed
+        }
+
+        $password = $this->secret('Enter password: ');
+
+        $env = $this->choice(
+            'Select environment:',
+            ['development', 'staging', 'production'],
+            'development'
+        );
+
+        return 0;
+    }
+}
+```
+
+These convenience methods automatically use the injected `IInputReader`, making your commands fully testable without requiring actual user input.
+
+### TestInputReader Features
+
+The `TestInputReader` class provides:
+
+- **Response Queue**: Pre-program multiple responses with `addResponse()` or `addResponses()`
+- **Prompt History**: Track all prompts shown with `getPromptHistory()`
+- **Automatic Validation**: Throws exceptions if responses run out, helping catch test bugs
+- **Fluent Interface**: Chain `addResponse()` calls for cleaner test setup
+- **Full Interface Support**: Implements all `IInputReader` methods (prompt, confirm, secret, choice)
+
+```php
+$reader = new TestInputReader();
+$reader
+    ->addResponse('value1')
+    ->addResponse('value2')
+    ->addResponse('yes');
+
+// Check if there are responses remaining
+if ($reader->hasMoreResponses()) {
+    $count = $reader->getRemainingResponseCount();
+}
+
+// Get history of prompts
+$prompts = $reader->getPromptHistory();
+
+// Reset for reuse
+$reader->reset();
+```
+
 ## Contributing
 
 When adding new features to the CLI component:

src/Cli/Commands/Command.php

@@ -4,6 +4,8 @@
 
 use Neuron\Cli\Console\Input;
 use Neuron\Cli\Console\Output;
+use Neuron\Cli\IO\IInputReader;
+use Neuron\Cli\IO\StdinInputReader;
 
 /**
  * Abstract base class for all CLI commands.
@@ -14,6 +16,7 @@ abstract class Command
 {
 	protected Input $input;
 	protected Output $output;
+	protected ?IInputReader $inputReader = null;
 	protected array $arguments = [];
 	protected array $options = [];
 
@@ -287,7 +290,7 @@ public function hasOption( string $name ): bool
 
 	/**
 	 * Validate that required arguments are present
-	 * 
+	 *
 	 * @throws \InvalidArgumentException
 	 * @return void
 	 */
@@ -301,4 +304,128 @@ public function validate(): void
 			}
 		}
 	}
+
+	/**
+	 * Get the input reader instance.
+	 *
+	 * Creates a default StdinInputReader if not already set.
+	 * This enables testable CLI commands by abstracting user input.
+	 *
+	 * If output hasn't been set, a default Output instance will be created automatically.
+	 *
+	 * @return IInputReader
+	 */
+	protected function getInputReader(): IInputReader
+	{
+		if( !$this->inputReader ) {
+			// Ensure output is initialized before creating StdinInputReader
+			if( !isset( $this->output ) ) {
+				$this->output = new Output();
+			}
+
+			$this->inputReader = new StdinInputReader( $this->output );
+		}
+
+		return $this->inputReader;
+	}
+
+	/**
+	 * Set the input reader (for dependency injection, especially in tests).
+	 *
+	 * This allows tests to inject a TestInputReader with pre-programmed
+	 * responses instead of requiring actual user input.
+	 *
+	 * @param IInputReader $inputReader
+	 * @return self
+	 */
+	public function setInputReader( IInputReader $inputReader ): self
+	{
+		$this->inputReader = $inputReader;
+		return $this;
+	}
+
+	/**
+	 * Prompt user for input.
+	 *
+	 * Convenience method that delegates to the input reader.
+	 *
+	 * Example:
+	 * ```php
+	 * $name = $this->prompt( "Enter your name: " );
+	 * ```
+	 *
+	 * @param string $message The prompt message to display
+	 * @return string The user's response (trimmed)
+	 */
+	protected function prompt( string $message ): string
+	{
+		return $this->getInputReader()->prompt( $message );
+	}
+
+	/**
+	 * Ask user for yes/no confirmation.
+	 *
+	 * Convenience method that delegates to the input reader.
+	 * Accepts: y, yes, true, 1 (case-insensitive) as positive responses.
+	 *
+	 * Example:
+	 * ```php
+	 * if( $this->confirm( "Delete all files?" ) ) {
+	 *     // User confirmed
+	 * }
+	 * ```
+	 *
+	 * @param string $message The confirmation message
+	 * @param bool $default Default value if user just presses enter
+	 * @return bool True if user confirms, false otherwise
+	 */
+	protected function confirm( string $message, bool $default = false ): bool
+	{
+		return $this->getInputReader()->confirm( $message, $default );
+	}
+
+	/**
+	 * Prompt for sensitive input without echoing to console.
+	 *
+	 * Convenience method that delegates to the input reader.
+	 * Note: Secret input hiding only works on Unix-like systems.
+	 *
+	 * Example:
+	 * ```php
+	 * $password = $this->secret( "Enter password: " );
+	 * ```
+	 *
+	 * @param string $message The prompt message
+	 * @return string The user's input (trimmed)
+	 */
+	protected function secret( string $message ): string
+	{
+		return $this->getInputReader()->secret( $message );
+	}
+
+	/**
+	 * Prompt user to select from a list of options.
+	 *
+	 * Convenience method that delegates to the input reader.
+	 * Users can select by entering either the option index (numeric)
+	 * or the exact option text.
+	 *
+	 * Example:
+	 * ```php
+	 * $env = $this->choice(
+	 *     "Select environment:",
+	 *     ['development', 'staging', 'production'],
+	 *     'development'
+	 * );
+	 * ```
+	 *
+	 * @param string $message The prompt message
+	 * @param array<string> $options Available options
+	 * @param string|null $default Default option (will be marked with *)
+	 * @return string The selected option
+	 */
+	protected function choice( string $message, array $options, ?string $default = null ): string
+	{
+		return $this->getInputReader()->choice( $message, $options, $default );
+	}
 }

src/Cli/IO/IInputReader.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace Neuron\Cli\IO;
+
+/**
+ * Interface for reading user input in CLI commands.
+ *
+ * Provides an abstraction over STDIN to enable testable CLI commands.
+ * Implementations can read from actual user input (StdinInputReader)
+ * or from pre-programmed responses (TestInputReader) for testing.
+ *
+ * @package Neuron\Cli\IO
+ */
+interface IInputReader
+{
+	/**
+	 * Prompt user for input and return their response.
+	 *
+	 * @param string $message The prompt message to display
+	 * @return string The user's response (trimmed)
+	 */
+	public function prompt( string $message ): string;
+
+	/**
+	 * Ask user for yes/no confirmation.
+	 *
+	 * Accepts: y, yes, true, 1 (case-insensitive) as positive responses.
+	 * All other inputs are treated as negative responses.
+	 *
+	 * @param string $message The confirmation message
+	 * @param bool $default Default value if user just presses enter
+	 * @return bool True if user confirms, false otherwise
+	 */
+	public function confirm( string $message, bool $default = false ): bool;
+
+	/**
+	 * Prompt for sensitive input without echoing to console.
+	 *
+	 * Note: Secret input is only supported on Unix-like systems.
+	 * On Windows, input will be visible.
+	 *
+	 * @param string $message The prompt message
+	 * @return string The user's input (trimmed)
+	 */
+	public function secret( string $message ): string;
+
+	/**
+	 * Prompt user to select from a list of options.
+	 *
+	 * Users can select by entering either the option index (numeric)
+	 * or the exact option text.
+	 *
+	 * @param string $message The prompt message
+	 * @param array<string> $options Available options
+	 * @param string|null $default Default option (will be marked with *)
+	 * @return string The selected option
+	 */
+	public function choice( string $message, array $options, ?string $default = null ): string;
+}