update contribution guideline for new tests

CONTRIBUTING.md

@@ -179,35 +179,80 @@ The test algorithm will generate your SDK from a small demo SDK JSON spec file a
 
 To get started, create a language file in this location:
 
-`./tests/languages/tests-for-[MY-LANGUAGE].[MY-LANGUAGE-FILE-EXT]`
+`./tests/languages/<language>/test.[MY-LANGUAGE-FILE-EXT]`
 
 In your new language file, init your SDK from a relative path which will be generated here: `./tests/sdks/` from this spec file: `./tests/resources/spec.json`.
 
 After you finish initializing, make a series of HTTP calls using your new generated SDKs method just like in one of these examples:
 
-1. tests/languages/tests-for-php.js
-2. tests/languages/tests-for-node.js
+1. tests/languages/php/test.php
+2. tests/languages/node/test.js
 
 > Note: In your test files, make sure that you begin the test with the following string "\nTest Started\n". We use this string to filter output from the build tool you're using.
 
-Once done, add a Docker command that can execute your test file to the SDK test algorithm `$containers` array in this location: `./tests/SDKTest.php:17`. Make sure to add one command for each language version you wish to support.
+Once done, create a new test file `tests/[Language]Test.php` and update as the following.
 
-A good example is the PHP test for 5 different PHP versions:
+```php
+<?php
+
+namespace Tests;
+
+class [Language]Test extends Base
+{
+    protected string $language = '[language]';
+    protected string $class = 'Appwrite\SDK\Language\[Language]';
+    protected array $build = [
+        //commands required before executing the test
+    ];
+    protected array $envs = [
+        // docker commands that can execute test file to the sdk test. Make sure to add
+        // one command for each lanuage version you wish to support
+    ];
+
+    // list of expected outputs from test based on features supported
+    protected array $expectedOutput = [
+        ...Base::FOO_RESPONSES,
+        ...Base::BAR_RESPONSES,
+        ...Base::GENERAL_RESPONSES,
+        ...Base::EXCEPTION_RESPONSES,
+        ...Base::REALTIME_RESPONSES
+    ];
+}
+```
+
+A good example is the Dart test:
 
 ```php
-protected $containers = [
-    'php-5.6' => 'docker run --rm -v $(pwd):/app -w /app php:5.6-cli php tests/languages/tests-for-php.php',
-    'php-7.0' => 'docker run --rm -v $(pwd):/app -w /app php:7.0-cli php tests/languages/tests-for-php.php',
-    'php-7.1' => 'docker run --rm -v $(pwd):/app -w /app php:7.1-cli php tests/languages/tests-for-php.php',
-    'php-7.2' => 'docker run --rm -v $(pwd):/app -w /app php:7.2-cli php tests/languages/tests-for-php.php',
-    'php-7.3' => 'docker run --rm -v $(pwd):/app -w /app php:7.3-cli php tests/languages/tests-for-php.php',
-    'php-7.4' => 'docker run --rm -v $(pwd):/app -w /app php:7.4-cli php tests/languages/tests-for-php.php',
-];
+<?php
+
+namespace Tests;
+
+class DartTest extends Base
+{
+    protected string $language = 'dart';
+    protected string $class = 'Appwrite\SDK\Language\Dart';
+    protected array $build = [
+        'mkdir -p tests/sdks/dart/tests',
+        'cp tests/languages/dart/tests.dart tests/sdks/dart/tests/tests.dart',
+    ];
+    protected array $envs = [
+        'dart-stable' => 'docker run --rm -v $(pwd):/app -w /app/tests/sdks/dart dart:stable sh -c "dart pub get && dart pub run tests/tests.dart"',
+        'dart-beta' => 'docker run --rm -v $(pwd):/app -w /app/tests/sdks/dart dart:beta sh -c "dart pub get && dart pub run tests/tests.dart"',
+    ];
+    protected array $expectedOutput = [
+        ...Base::FOO_RESPONSES,
+        ...Base::BAR_RESPONSES,
+        ...Base::GENERAL_RESPONSES,
+        ...Base::EXCEPTION_RESPONSES,
+    ];
+}
 ```
 
-Finally, you can run the tests using
+Also in `.travis.yml` add new env `SDK=[Language]` so that travis will run test for this language as well.
+
+Finally, you can run tests using
 ```sh
-docker run --rm -v $(pwd):$(pwd):rw -w $(pwd) -v /var/run/docker.sock:/var/run/docker.sock  php:7.4-cli-alpine sh -c "apk add docker-cli && vendor/bin/phpunit tests/SDKTest.php"
+docker run --rm -v $(pwd):$(pwd):rw -w $(pwd) -v /var/run/docker.sock:/var/run/docker.sock  php:7.4-cli-alpine sh -c "apk add docker-cli && vendor/bin/phpunit"
 ```
 
 ## SDK Generator Interface