add cache spec

spec/unit/cache_spec.lua

@@ -0,0 +1,57 @@
+require "defaults"
+package.path = "?.lua;common/?.lua;frontend/?.lua"
+package.cpath = "?.so;common/?.so;/usr/lib/lua/?.so"
+
+require "libs/libkoreader-lfs"
+-- global einkfb for Screen
+einkfb = require("ffi/framebuffer")
+-- do not show SDL window
+einkfb.dummy = true
+Blitbuffer = require("ffi/blitbuffer")
+
+local Screen = require("ui/screen")
+local DocSettings = require("docsettings")
+G_reader_settings = DocSettings:open(".reader")
+local DocumentRegistry = require("document/documentregistry")
+local Cache = require("cache")
+local DEBUG = require("dbg")
+--DEBUG:turnOn()
+
+-- screen should be inited for crengine
+Screen:init()
+
+describe("Cache module", function()
+    local sample_pdf = "spec/front/unit/data/sample.pdf"
+    local doc = DocumentRegistry:openDocument(sample_pdf)
+    it("should clear cache", function()
+        Cache:clear()
+    end)
+    it("should serialize blitbuffer", function()
+        for pageno = 1, math.min(10, doc.info.number_of_pages) do
+            doc:renderPage(pageno, nil, 1, 0, 1.0, 0)
+            Cache:serialize()
+        end
+        Cache:clear()
+    end)
+    it("should deserialize blitbuffer", function()
+        for pageno = 1, math.min(10, doc.info.number_of_pages) do
+            doc:hintPage(pageno, 1, 0, 1.0, 0)
+        end
+        Cache:clear()
+    end)
+    it("should serialize koptcontext", function()
+        doc.configurable.text_wrap = 1
+        for pageno = 1, math.min(10, doc.info.number_of_pages) do
+            doc:renderPage(pageno, nil, 1, 0, 1.0, 0)
+            doc:getPageDimensions(pageno)
+            Cache:serialize()
+        end
+        Cache:clear()
+    end)
+    it("should deserialize koptcontext", function()
+        for pageno = 1, math.min(10, doc.info.number_of_pages) do
+            doc:renderPage(pageno, nil, 1, 0, 1.0, 0)
+        end
+        Cache:clear()
+    end)
+end)