feature: set environment variables

closes #239

src/Process.php

@@ -16,6 +16,8 @@ class Process {
 	/** @var array<string, mixed> */
 	protected array $status;
 	protected bool $isBlocking = false;
+	/** @var array<string, string> */
+	protected array $env = [];
 
 	public function __construct(string...$command) {
 		$this->command = $command;
@@ -31,6 +33,10 @@ public function setExecCwd(string $cwd):void {
 		$this->cwd = $cwd;
 	}
 
+	public function setEnv(string $key, string $value):void {
+		$this->env[$key] = $value;
+	}
+
 	/**
 	 * Runs the command in a concurrent thread.
 	 * Sets the input, output and errors streams.
@@ -54,7 +60,7 @@ public function exec():void {
 			$this->command,
 			$descriptor,
 			$this->pipes,
-//			env_vars: $this->env,
+			env_vars: $this->env,
 		);
 		if(!$this->process) {
 			throw new CommandNotFoundException($this->command[0]);

test/phpunit/ProcessTest.php

@@ -163,4 +163,12 @@ public function testExecBlocking() {
 		$sut->exec();
 		self::assertFalse($sut->isRunning());
 	}
-}
+
+	public function testSetEnv() {
+		$sut = new Process("printenv");
+		$sut->setEnv("NAME", "PHPUnit");
+		$sut->exec();
+		$output = $sut->getOutput();
+		self::assertStringContainsString("NAME=PHPUnit\n", $output);
+	}
+}