Add some helper tests

Author: vaisest

spec/System/TestTradeHelpers_spec.lua

@@ -0,0 +1,65 @@
+describe("TradeHelpers trade hash matching", function()
+	local tradeHelpers = LoadModule("Classes/TradeHelpers")
+
+	---@param ids number[]
+	---@param expected number
+	---@return boolean contains whether the given array contains the expected id
+	local function contains(ids, expected)
+		for _, id in ipairs(ids) do
+			if id == expected then return true end
+		end
+		return false
+	end
+
+	describe("modLineValue", function()
+		it("returns the single number on a line", function()
+			assert.equal(50, tradeHelpers.modLineValue("+50 to maximum Life"))
+		end)
+
+		it("returns the midpoint of a '# to #' range", function()
+			assert.equal(15, tradeHelpers.modLineValue("Adds 10 to 20 Fire Damage"))
+			assert.equal(12.5, tradeHelpers.modLineValue("Adds 10 to 15 Fire Damage"))
+		end)
+
+		it("handles negative numbers", function()
+			assert.equal(-10, tradeHelpers.modLineValue("-10% to Fire Resistance"))
+		end)
+
+		it("returns nil when onlyFromTo is set and there is no range", function()
+			assert.is_nil(tradeHelpers.modLineValue("+50 to maximum Life", true))
+		end)
+	end)
+
+	describe("findTradeHash", function()
+		it("matches a simple mod", function()
+			local ids, value = tradeHelpers.findTradeHash("+50 to maximum Life")
+			assert.equal(50, value)
+			assert.is_true(contains(ids, HashStats({ "base_maximum_life" })))
+		end)
+
+		it("matches a percentage mod", function()
+			local ids, value = tradeHelpers.findTradeHash("25% reduced maximum Energy Shield")
+			assert.equal(25, value)
+			assert.is_true(contains(ids, HashStats({ "maximum_energy_shield_+%" })))
+		end)
+
+		it("matches a # to #  mod", function()
+			local ids, value = tradeHelpers.findTradeHash("Adds 5 to 15 Fire Damage")
+			assert.equal(10, value)
+			assert.is_true(contains(ids, HashStats({ "local_minimum_added_fire_damage", "local_maximum_added_fire_damage" })))
+		end)
+
+		it("returns no results for an unmatchable line", function()
+			local ids = tradeHelpers.findTradeHash("+100 to IQ")
+			assert.equal(0, #ids)
+		end)
+
+		it("works thrice in a row", function()
+			local a = tradeHelpers.findTradeHash("+50 to maximum Life")
+			local b = tradeHelpers.findTradeHash("+50 to maximum Life")
+			local c = tradeHelpers.findTradeHash("+50 to maximum Life")
+			assert.same(a, b)
+			assert.same(b, c)
+		end)
+	end)
+end)