Spec test for setMaxScreenLineLength

spec/text-editor-spec.coffee

@@ -5918,3 +5918,12 @@ describe "TextEditor", ->
   describe "::getElement", ->
     it "returns an element", ->
       expect(editor.getElement() instanceof HTMLElement).toBe(true)
+
+  describe 'setMaxScreenLineLength', ->
+    it "sets the maximum line length in the editor before soft wrapping is forced", ->
+      expect(editor.maxScreenLineLength()).toBe 500
+      editor.update({
+        maxScreenLineLength: 1500
+      })
+      expect(editor.maxScreenLineLength()).toBe 1500
+