Unit tests: word gap - space condensing (#4036)

spec/unit/readerrolling_spec.lua

@@ -182,6 +182,20 @@ describe("Readerrolling module", function()
         end)
     end)
 
+    describe("test changing word gap - space condensing", function()
+        it("should show pages for different word gap", function()
+            readerui.document:setSpaceCondensing(100)
+            readerui:handleEvent(Event:new("ChangeScreenMode", "portrait"))
+            assert.are.same(208, readerui.document:getPageCount())
+            readerui.document:setSpaceCondensing(75)
+            readerui:handleEvent(Event:new("ChangeScreenMode", "portrait"))
+            assert.are.same(205, readerui.document:getPageCount())
+            readerui.document:setSpaceCondensing(50)
+            readerui:handleEvent(Event:new("ChangeScreenMode", "portrait"))
+            assert.are.same(199, readerui.document:getPageCount())
+        end)
+    end)
+
     describe("test initialization", function()
         it("should emit PageUpdate event after book is rendered", function()
             local ReaderView = require("apps/reader/modules/readerview")