diff --git a/source/BaselineOfHOP/BaselineOfHOP.class.st b/source/BaselineOfHOP/BaselineOfHOP.class.st
index 66f9977..868cbae 100644
--- a/source/BaselineOfHOP/BaselineOfHOP.class.st
+++ b/source/BaselineOfHOP/BaselineOfHOP.class.st
@@ -20,6 +20,8 @@ BaselineOfHOP >> baseline: spec [
 				spec requires: #('HOP-Core') ];
 			package: 'HOP-Extra' with: [ 
 				spec requires: #('HOP-Core') ];
+			package: 'HOP-Extra-Tests' with: [ 
+				spec requires: #('HOP-Extra') ];
 			package: 'HOP-Roassal' with: [ 
 				spec requires: #('HOP-Core') ] ]
 ]
diff --git a/source/HOP-Extra-Tests/HOPTestZincHandler.class.st b/source/HOP-Extra-Tests/HOPTestZincHandler.class.st
new file mode 100644
index 0000000..c76707a
--- /dev/null
+++ b/source/HOP-Extra-Tests/HOPTestZincHandler.class.st
@@ -0,0 +1,26 @@
+Class {
+	#name : 'HOPTestZincHandler',
+	#superclass : 'Object',
+	#instVars : [
+		'answer',
+		'seenRequest'
+	],
+	#category : 'HOP-Extra-Tests',
+	#package : 'HOP-Extra-Tests'
+}
+
+{ #category : 'accessing' }
+HOPTestZincHandler >> answer: aString [
+	answer := aString
+]
+
+{ #category : 'public' }
+HOPTestZincHandler >> handleRequest: aRequest [
+	seenRequest := aRequest.
+	^ ZnResponse ok: (ZnEntity text: answer)
+]
+
+{ #category : 'accessing' }
+HOPTestZincHandler >> seenRequest [
+	^ seenRequest
+]
diff --git a/source/HOP-Extra-Tests/HOPZincHandlerCallTest.class.st b/source/HOP-Extra-Tests/HOPZincHandlerCallTest.class.st
new file mode 100644
index 0000000..8dc940b
--- /dev/null
+++ b/source/HOP-Extra-Tests/HOPZincHandlerCallTest.class.st
@@ -0,0 +1,28 @@
+Class {
+	#name : 'HOPZincHandlerCallTest',
+	#superclass : 'TestCase',
+	#category : 'HOP-Extra-Tests',
+	#package : 'HOP-Extra-Tests'
+}
+
+{ #category : 'tests' }
+HOPZincHandlerCallTest >> testTheConfiguredHandlerIsTheOneThatAnswers [
+	"The point of carrying the handler rather than its class: whoever builds the route can
+	prepare it, and that same prepared object answers the request."
+	| handler call request |
+	handler := HOPTestZincHandler new answer: 'prepared'; yourself.
+	call := HOPZincHandlerCall new handler: handler; yourself.
+	request := ZnRequest get: '/anything'.
+	self
+		assert: (call handleRoute: (HOPRouteMatch new request: request; yourself)) entity contents
+		equals: 'prepared'.
+	self assert: handler seenRequest identicalTo: request
+]
+
+{ #category : 'tests' }
+HOPZincHandlerCallTest >> testACallAnswersItselfAsRouteHandler [
+	"A prepared instance goes into the route as it is - that is what makes it configurable."
+	| call |
+	call := HOPZincHandlerCall new.
+	self assert: call asHOPRouteHandler identicalTo: call
+]
diff --git a/source/HOP-Extra-Tests/package.st b/source/HOP-Extra-Tests/package.st
new file mode 100644
index 0000000..43fff7a
--- /dev/null
+++ b/source/HOP-Extra-Tests/package.st
@@ -0,0 +1 @@
+Package { #name : 'HOP-Extra-Tests' }
diff --git a/source/HOP-Extra/HOPZincHandlerCall.class.st b/source/HOP-Extra/HOPZincHandlerCall.class.st
new file mode 100644
index 0000000..1690514
--- /dev/null
+++ b/source/HOP-Extra/HOPZincHandlerCall.class.st
@@ -0,0 +1,23 @@
+Class {
+	#name : 'HOPZincHandlerCall',
+	#superclass : 'HOPCall',
+	#instVars : [
+		'handler'
+	],
+	#category : 'HOP-Extra',
+	#package : 'HOP-Extra'
+}
+
+{ #category : 'execution' }
+HOPZincHandlerCall >> execute [
+	^ handler handleRequest: self request
+]
+
+{ #category : 'accessing' }
+HOPZincHandlerCall >> handler: anObject [
+	"Anything that answers handleRequest: with a ZnResponse. Carrying the handler itself rather
+	than its class is the point: it can be configured where the route is built, which is where
+	the deployment knows what it wants. HOPZincHandlerAdaptor cannot - it says handlerClass new
+	and leaves nobody a moment to say anything about it."
+	handler := anObject
+]