Resolve "Write back-end tests for TARA integration"

Closes #13

src/main/java/ee/eesti/kyc/config/OAuth2Config.java

@@ -3,10 +3,15 @@ package ee.eesti.kyc.config;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
+import org.springframework.context.annotation.PropertySources;
 import org.springframework.core.env.Environment;
 
 @Configuration
-@PropertySource(value = "classpath:/application.properties")
+@PropertySources({
+        @PropertySource(value = "classpath:application.properties"),
+        @PropertySource(value = "classpath:additional.properties", ignoreResourceNotFound = true)
+})
+
 public class OAuth2Config {
     @Autowired
     Environment env;
@@ -46,3 +51,4 @@ public class OAuth2Config {
         return env.getProperty(REDIRECT_URI);
     }
 }
+