diff --git a/module/core/former/tests/inc/former_tests/container_former_common.rs b/module/core/former/tests/inc/former_tests/container_former_common.rs
index a251cef936..954e887892 100644
--- a/module/core/former/tests/inc/former_tests/container_former_common.rs
+++ b/module/core/former/tests/inc/former_tests/container_former_common.rs
@@ -29,15 +29,11 @@ fn definitions()
   {
   }
 
-  // f1( former::VectorDefinition::< String, () >::default() );
+  f1( former::VectorDefinition::< String, (), Vec< String >, the_module::NoEnd >::default() );
   f2( former::VectorDefinition::< String, (), Vec< String >, the_module::NoEnd >::default() );
   f3::< former::VectorDefinition< String, (), Vec< String >, the_module::NoEnd >, the_module::ReturnStorage >( the_module::ReturnStorage );
   f3::< < former::VectorDefinition< String, (), Vec< String >, the_module::NoEnd > as the_module::FormerDefinition >::Types, the_module::ReturnStorage >( the_module::ReturnStorage );
 
-  // assert_eq!( 0, 1 );
-
-  let vec : Vec< String > = vec![ "a".into(), "b".into(), "c".into() ];
-
 }
 
 //
diff --git a/module/core/former/tests/inc/former_tests/container_former_hashmap.rs b/module/core/former/tests/inc/former_tests/container_former_hashmap.rs
index cfe3574aed..da24fc1ec1 100644
--- a/module/core/former/tests/inc/former_tests/container_former_hashmap.rs
+++ b/module/core/former/tests/inc/former_tests/container_former_hashmap.rs
@@ -8,14 +8,71 @@ use collection_tools::HashMap;
 // qqq : zzz : remove #[ cfg( not( feature = "use_alloc" ) ) ]
 #[ cfg( not( feature = "use_alloc" ) ) ]
 #[ test ]
-fn push()
+fn add()
 {
 
-  //
+  // expliccit with ContainerSubformer
+
+  let got : HashMap< String, String > = the_module
+  ::ContainerSubformer
+  ::< ( String, String ), former::HashMapDefinition< String, String, (), HashMap< String, String >, the_module::ReturnStorage > >
+  ::new( former::ReturnStorage )
+  .add( ( "a".into(), "x".into() ) )
+  .add( ( "b".into(), "y".into() ) )
+  .form();
+  let exp = hmap!
+  [
+    "a".to_string() => "x".to_string(),
+    "b".to_string() => "y".to_string(),
+  ];
+  a_id!( got, exp );
+
+  // expliccit with HashMapSubformer
+
+  let got : HashMap< String, String > = the_module::HashMapSubformer::< String, String, (), HashMap< String, String >, the_module::ReturnStorage >
+  ::new( former::ReturnStorage )
+  .add( ( "a".into(), "x".into() ) )
+  .add( ( "b".into(), "y".into() ) )
+  .form();
+  let exp = hmap!
+  [
+    "a".to_string() => "x".to_string(),
+    "b".to_string() => "y".to_string(),
+  ];
+  a_id!( got, exp );
+
+  // compact with HashMapSubformer
+
+  let got : HashMap< String, String > = the_module::HashMapSubformer::new( former::ReturnStorage )
+  .add( ( "a".into(), "x".into() ) )
+  .add( ( "b".into(), "y".into() ) )
+  .form();
+  let exp = hmap!
+  [
+    "a".to_string() => "x".to_string(),
+    "b".to_string() => "y".to_string(),
+  ];
+  a_id!( got, exp );
+
+  // with begin
+
+  let got : HashMap< String, String > = the_module::HashMapSubformer
+  ::begin( Some( hmap![ "a".to_string() => "x".to_string() ] ), Some( () ), former::ReturnStorage )
+  .add( ( "b".into(), "y".into() ) )
+  .form();
+  let exp = hmap!
+  [
+    "a".to_string() => "x".to_string(),
+    "b".to_string() => "y".to_string(),
+  ];
+  a_id!( got, exp );
+
+  // with help of ext
 
-  let got : HashMap< String, String > = the_module::HashMapSubformer::new()
-  .insert( "a", "x" )
-  .insert( "b", "y" )
+  use the_module::HashMapExt;
+  let got : HashMap< String, String > = HashMap::former()
+  .add( ( "a".into(), "x".into() ) )
+  .add( ( "b".into(), "y".into() ) )
   .form();
   let exp = hmap!
   [
@@ -24,6 +81,8 @@ fn push()
   ];
   a_id!( got, exp );
 
+  //
+
 }
 
 // qqq : zzz : remove #[ cfg( not( feature = "use_alloc" ) ) ]
@@ -32,9 +91,9 @@ fn push()
 fn replace()
 {
 
-  let got : HashMap< String, String > = the_module::HashMapSubformer::new()
-  .insert( "x", "x" )
-  .replace( hmap![ "a".to_string() => "x".to_string(), "b".to_string() => "y".to_string() ] )
+  let got : HashMap< String, String > = the_module::HashMapSubformer::new( former::ReturnStorage )
+  .add( ( "x".to_string(), "y".to_string() ) )
+  .replace( hmap![ "a".to_string() => "x".to_string(), "b".to_string() => "y".to_string(), ] )
   .form();
   let exp = hmap!
   [
@@ -44,4 +103,3 @@ fn replace()
   a_id!( got, exp );
 
 }
-
diff --git a/module/core/former/tests/inc/mod.rs b/module/core/former/tests/inc/mod.rs
index e8b2ed3c47..6e963751ab 100644
--- a/module/core/former/tests/inc/mod.rs
+++ b/module/core/former/tests/inc/mod.rs
@@ -13,8 +13,8 @@ mod former_tests
   mod container_former_vec;
   #[ cfg( any( not( feature = "no_std" ), feature = "use_alloc" ) ) ]
   mod container_former_hashset;
-  // #[ cfg( any( not( feature = "no_std" ), feature = "use_alloc" ) ) ]
-  // mod container_former_hashmap;
+  #[ cfg( any( not( feature = "no_std" ), feature = "use_alloc" ) ) ]
+  mod container_former_hashmap;
 
   // mod a_primitives_manual;
   // mod a_primitives;