Added test for the config file.

src/settings.rs

@@ -13,6 +13,7 @@ impl Settings {
         let s = Config::builder()
             .set_default("port", 9090)?
             .set_default("address", "127.0.0.1")?
+            .add_source(config::File::with_name("morethantext").required(false))
             .add_source(
                 config::Environment::with_prefix("MTT")
                     .try_parsing(true)

tests/features/server_start.feature

@@ -8,7 +8,14 @@ Feature: Server Start
 		When the home page is accessed
 		Then the status should be OK
 
-	Scenario: Start using the server on another port
+	Scenario: Start using the server on another port 
+		Given a server
+		And port is changed to something different
+		And it is running
+		When the home page is accessed
+		Then the status should be OK
+
+	Scenario: Using environment variables use another port
 		Given a server
 		And port is changed to something different
 		And environment variables are used