Return disposable from ViewRegistry::addViewProvider

spec/view-registry-spec.coffee

@@ -73,3 +73,16 @@ describe "ViewRegistry", ->
         describe "when the object has no .getViewClass() method", ->
           it "throws an exception", ->
             expect(-> registry.getView(new Object)).toThrow()
+
+  describe "::addViewProvider(providerSpec)", ->
+    it "returns a disposable that can be used to removed the provider", ->
+      class TestModel
+      class TestView
+        setModel: (@model) ->
+      disposable = registry.addViewProvider
+        modelClass: TestModel
+        viewClass: TestView
+
+      expect(registry.getView(new TestModel) instanceof TestView).toBe true
+      disposable.dispose()
+      expect(-> registry.getView(new TestModel)).toThrow()

src/view-registry.coffee

@@ -1,3 +1,4 @@
+{Disposable} = require 'event-kit'
 {jQuery} = require './space-pen-extensions'
 
 module.exports =
@@ -6,8 +7,10 @@ class ViewRegistry
     @views = new WeakMap
     @providers = []
 
-  addViewProvider: (provider) ->
-    @providers.push(provider)
+  addViewProvider: (providerSpec) ->
+    @providers.push(providerSpec)
+    new Disposable =>
+      @providers = @providers.filter (provider) -> provider isnt providerSpec
 
   getView: (object) ->
     return unless object?