[Feature]: Add support for creating app using yaml config (#787)

tests/apps/test_apps.py

@@ -1,8 +1,11 @@
 import os
 import unittest
 
+import yaml
+
 from embedchain import App, CustomApp, Llama2App, OpenSourceApp
-from embedchain.config import ChromaDbConfig, AppConfig, AddConfig, BaseLlmConfig, BaseEmbedderConfig
+from embedchain.config import (AddConfig, AppConfig, BaseEmbedderConfig,
+                               BaseLlmConfig, ChromaDbConfig)
 from embedchain.embedder.base import BaseEmbedder
 from embedchain.llm.base import BaseLlm
 from embedchain.vectordb.base import BaseVectorDB, BaseVectorDbConfig
@@ -100,3 +103,74 @@ class TestConfigForAppComponents(unittest.TestCase):
             App(embedder_config=wrong_embedder_config)
 
         self.assertIsInstance(embedder_config, BaseEmbedderConfig)
+
+
+class TestAppFromConfig:
+    def load_config_data(self, yaml_path):
+        with open(yaml_path, "r") as file:
+            return yaml.safe_load(file)
+
+    def test_from_chroma_config(self):
+        yaml_path = "embedchain/yaml/chroma.yaml"
+        config_data = self.load_config_data(yaml_path)
+
+        app = App.from_config(yaml_path)
+
+        # Check if the App instance and its components were created correctly
+        assert isinstance(app, App)
+
+        # Validate the AppConfig values
+        assert app.config.id == config_data["app"]["config"]["id"]
+        assert app.config.collection_name == config_data["app"]["config"]["collection_name"]
+        # Even though not present in the config, the default value is used
+        assert app.config.collect_metrics is True
+
+        # Validate the LLM config values
+        llm_config = config_data["llm"]["config"]
+        assert app.llm.config.temperature == llm_config["temperature"]
+        assert app.llm.config.max_tokens == llm_config["max_tokens"]
+        assert app.llm.config.top_p == llm_config["top_p"]
+        assert app.llm.config.stream == llm_config["stream"]
+
+        # Validate the VectorDB config values
+        db_config = config_data["vectordb"]["config"]
+        assert app.db.config.collection_name == db_config["collection_name"]
+        assert app.db.config.dir == db_config["dir"]
+        assert app.db.config.allow_reset == db_config["allow_reset"]
+
+        # Validate the Embedder config values
+        embedder_config = config_data["embedder"]["config"]
+        assert app.embedder.config.model == embedder_config["model"]
+        assert app.embedder.config.deployment_name == embedder_config["deployment_name"]
+
+    def test_from_opensource_config(self):
+        yaml_path = "embedchain/yaml/opensource.yaml"
+        config_data = self.load_config_data(yaml_path)
+
+        app = App.from_config(yaml_path)
+
+        # Check if the App instance and its components were created correctly
+        assert isinstance(app, App)
+
+        # Validate the AppConfig values
+        assert app.config.id == config_data["app"]["config"]["id"]
+        assert app.config.collection_name == config_data["app"]["config"]["collection_name"]
+        assert app.config.collect_metrics == config_data["app"]["config"]["collect_metrics"]
+
+        # Validate the LLM config values
+        llm_config = config_data["llm"]["config"]
+        assert app.llm.config.temperature == llm_config["temperature"]
+        assert app.llm.config.max_tokens == llm_config["max_tokens"]
+        assert app.llm.config.top_p == llm_config["top_p"]
+        assert app.llm.config.stream == llm_config["stream"]
+
+        # Validate the VectorDB config values
+        db_config = config_data["vectordb"]["config"]
+        assert app.db.config.collection_name == db_config["collection_name"]
+        assert app.db.config.dir == db_config["dir"]
+        assert app.db.config.allow_reset == db_config["allow_reset"]
+
+        # Validate the Embedder config values
+        embedder_config = config_data["embedder"]["config"]
+        assert app.embedder.config.model == embedder_config["model"]
+        assert app.embedder.config.deployment_name == embedder_config["deployment_name"]