Add Config Set import/export feature

spec/System/TestConfigSetCodec_spec.lua

@@ -0,0 +1,116 @@
+describe("TestConfigSetCodec", function()
+	local savedDeflate, savedInflate
+
+	before_each(function()
+		newBuild()
+		-- Headless stubs for Deflate/Inflate return "",
+		-- which would break encode/decode.
+		-- Replaced them with identity functions,
+		-- so that the base64 + XML layer is tested in isolation.
+		savedDeflate = Deflate
+		savedInflate = Inflate
+		_G.Deflate = function(data) return data end
+		_G.Inflate = function(data) return data end
+	end)
+
+	after_each(function()
+		_G.Deflate = savedDeflate
+		_G.Inflate = savedInflate
+	end)
+
+	it("export produces a non-empty base64 code", function()
+		local configTab = build.configTab
+		local configSet = configTab.configSets[configTab.activeConfigSetId]
+		configSet.input["usePowerCharges"] = true
+		local code = configTab:EncodeConfigSet(configSet)
+		assert.is_not_nil(code)
+		assert.is_true(#code > 0)
+	end)
+
+	it("roundtrip preserves boolean inputs", function()
+		local configTab = build.configTab
+		local configSet = configTab.configSets[configTab.activeConfigSetId]
+		configSet.input["usePowerCharges"] = true
+		local code = configTab:EncodeConfigSet(configSet)
+		local imported, err = configTab:DecodeConfigSet(code, "Test")
+		assert.is_nil(err)
+		assert.is_not_nil(imported)
+		assert.are.equal(true, imported.input["usePowerCharges"])
+	end)
+
+	it("roundtrip preserves numeric inputs", function()
+		local configTab = build.configTab
+		local configSet = configTab.configSets[configTab.activeConfigSetId]
+		-- Use 75 to avoid matching any boss-level placeholder (83/84/85),
+		-- which would cause GetDefaultState skip export.
+		configSet.input["enemyLevel"] = 75
+		local code = configTab:EncodeConfigSet(configSet)
+		local imported, err = configTab:DecodeConfigSet(code, "Test")
+		assert.is_nil(err)
+		assert.is_not_nil(imported)
+		assert.are.equal(75, imported.input["enemyLevel"])
+	end)
+
+	it("roundtrip preserves string inputs", function()
+		local configTab = build.configTab
+		local configSet = configTab.configSets[configTab.activeConfigSetId]
+		-- "Uber" is non-default (default is "Pinnacle" from defaultIndex=3)
+		configSet.input["enemyIsBoss"] = "Uber"
+		local code = configTab:EncodeConfigSet(configSet)
+		local imported, err = configTab:DecodeConfigSet(code, "Test")
+		assert.is_nil(err)
+		assert.is_not_nil(imported)
+		assert.are.equal("Uber", imported.input["enemyIsBoss"])
+	end)
+
+	it("roundtrip preserves multiple values simultaneously", function()
+		local configTab = build.configTab
+		local configSet = configTab.configSets[configTab.activeConfigSetId]
+		configSet.input["usePowerCharges"] = true
+		configSet.input["enemyLevel"] = 75
+		configSet.input["enemyIsBoss"] = "Uber"
+		local code = configTab:EncodeConfigSet(configSet)
+		local imported, err = configTab:DecodeConfigSet(code, "Multi")
+		assert.is_nil(err)
+		assert.is_not_nil(imported)
+		assert.are.equal(true, imported.input["usePowerCharges"])
+		assert.are.equal(75, imported.input["enemyLevel"])
+		assert.are.equal("Uber", imported.input["enemyIsBoss"])
+	end)
+
+	it("import uses the provided name, not the exported title", function()
+		local configTab = build.configTab
+		local configSet = configTab.configSets[configTab.activeConfigSetId]
+		configSet.title = "Original Title"
+		local code = configTab:EncodeConfigSet(configSet)
+		local imported, err = configTab:DecodeConfigSet(code, "Custom Name")
+		assert.is_nil(err)
+		assert.is_not_nil(imported)
+		assert.are.equal("Custom Name", imported.title)
+	end)
+
+	it("export and re-import of an unmodified config set succeeds", function()
+		local configTab = build.configTab
+		local configSet = configTab.configSets[configTab.activeConfigSetId]
+		local code = configTab:EncodeConfigSet(configSet)
+		assert.is_true(#code > 0)
+		local imported, err = configTab:DecodeConfigSet(code, "Imported")
+		assert.is_nil(err)
+		assert.is_not_nil(imported)
+		assert.are.equal("Imported", imported.title)
+	end)
+
+	it("returns error for garbage input", function()
+		local configTab = build.configTab
+		local _, err = configTab:DecodeConfigSet("!!!not_valid!!!", "Test")
+		assert.is_not_nil(err)
+	end)
+
+	it("returns error when decoded XML root is not a ConfigSet", function()
+		local configTab = build.configTab
+		local xmlText = "<PathOfBuilding></PathOfBuilding>"
+		local code = common.base64.encode(Deflate(xmlText)):gsub("+", "-"):gsub("/", "_")
+		local _, err = configTab:DecodeConfigSet(code, "Test")
+		assert.is_not_nil(err)
+	end)
+end)