ready

module/move/willbe/src/entity/features.rs

@@ -101,6 +101,7 @@ mod private
     Ok( features_powerset )
   }
 
+  /// Calculate estimate for `features_powerset.length`
   pub fn estimate_with
   (
     n : usize,
@@ -109,7 +110,8 @@ mod private
     with_none_features : bool,
     enabled_features : &[ String ],
     total_features : usize
-  ) -> usize 
+  ) 
+    -> usize 
   {
     let mut estimate = 0;
     let mut binom = 1;
@@ -141,22 +143,12 @@ mod private
 
     estimate
   }
-
-  // fn factorial( n : usize ) -> Result< usize >
-  // {
-  //   return if n <= 1
-  //   {
-  //     Ok( 1 )
-  //   }
-  //   else
-  //   {
-  //     n.checked_mul( factorial( n - 1 )? ).ok_or_else( || err!( "Too big value" ) )
-  //   }
-  // }
+
 }
 
 crate::mod_interface!
 {
   /// Features
   protected use features_powerset;
+  protected use estimate_with;
 }

module/move/willbe/tests/inc/entity/features.rs

@@ -6,6 +6,7 @@ use the_module::features::features_powerset;
 use std::collections::HashMap;
 use serde::Deserialize;
 use the_module::workspace::WorkspacePackage;
+use willbe::features::estimate_with;
 
 /// Constructs a mock `Package` with specified features for testing.
 fn mock_package( features : Vec< ( &str, Vec< &str > ) > ) -> WorkspacePackage
@@ -254,4 +255,14 @@ fn case_6()
   assert!( result.contains( &vec![ "f2".to_string() ].into_iter().collect()) );
 
   assert_eq!( result.len(), 2 );
+}
+
+#[ test ]
+fn estimate()
+{
+  assert_eq!( estimate_with( 5, 2, false, false, &[], 0 ), 16 );
+  assert_eq!( estimate_with( 5, 2, true, false, &[], 0 ), 17 );
+  assert_eq!( estimate_with( 5, 2, false, true, &[], 0 ), 17 );
+  assert_eq!( estimate_with( 5, 2, false, false, &[ "feature1".to_string(), "feature2".to_string() ], 2 ), 20 );
+  assert_eq!( estimate_with( 5, 2, true, true, &[ "feature1".to_string(), "feature2".to_string() ], 2 ), 22 );
 }