From 4f450ca94522f5c26a631fc4d19bd6eec420cbec Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Tue, 28 Mar 2023 13:15:27 -0500
Subject: implement EntityDb

---
 honey/ecs.test.lua | 164 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 162 insertions(+), 2 deletions(-)

(limited to 'honey/ecs.test.lua')

diff --git a/honey/ecs.test.lua b/honey/ecs.test.lua
index 9f7519b..fbdba30 100644
--- a/honey/ecs.test.lua
+++ b/honey/ecs.test.lua
@@ -1,5 +1,5 @@
 local function test(msg, f)
-	local success, error = pcall(f)
+	local success, error = xpcall(f, debug.traceback)
 	if success then
 		print(msg .. "\t\t[OK]")
 	else
@@ -12,8 +12,9 @@ end
 local ecs = require 'ecs'
 
 
-local Component = ecs.Component
+--===== Component tests =====--
 
+local Component = ecs.Component
 
 test("factories work as expected", function()
 	local factory = Component.newFactory("health", { percent=100 })
@@ -62,3 +63,162 @@ test("components serialize successfully with subcomponents", function()
 	assert(tbl.position.y == 9)
 	assert(tbl.position.z == 8)
 end)
+
+
+--===== EntityDb tests =====--
+
+local EntityDb = ecs.EntityDb
+
+
+test("EntityDb.createEntity() always returns a new id", function()
+	local db = EntityDb()
+
+	local ids = {}
+	for i=1,100 do
+		local id = db:createEntity()
+		assert(ids[id] == nil, "id was already returned!")
+		ids[id] = true
+	end
+end)
+
+
+test("EntityDb.queryComponent() gets all entities with a given component", function()
+	local db = EntityDb()
+
+	local ids = {}
+	for i=1,100 do
+		local id = db:createEntity()
+		if i%2==0 then
+			ids[id] = 5*i
+			db:addComponent(id, "number", 5*i)
+		end
+	end
+
+	local query = db:queryComponent("number")
+	local count = 0
+	for id, number in pairs(query) do
+		count = count + 1
+		assert(number == ids[id])
+	end
+	assert(count == 50)
+end)
+
+
+test("EntityDb.queryEntity() gets all components associated with an entity", function()
+	local db = EntityDb()
+
+	local entity
+	for i=1,100 do
+		local id = db:createEntity()
+		if i%2 == 0 then db:addComponent(id, "number", 2) end
+		if i%3 == 0 then db:addComponent(id, "string", "hello") end
+		if i%5 == 0 then db:addComponent(id, "number2", 4) end
+		if i%7 == 0 then db:addComponent(id, "string2", "world") end
+		if i == 30 then entity=id end
+	end
+
+	local query = db:queryEntity(entity)
+	assert(query.number == 2)
+	assert(query.string == "hello")
+	assert(query.number2 == 4)
+	assert(query.string2 == nil)
+end)
+
+
+test("EntityDb.removeComponent() removes components correctly", function()
+	local db = EntityDb()
+
+	local id = db:createEntity()
+	db:addComponent(id, "number", 2)
+	db:addComponent(id, "string", "hello")
+	db:addComponent(id, "number2", 4)
+	db:addComponent(id, "string2", "world")
+
+	local query = db:queryEntity(id)
+	assert(query.number == 2)
+	assert(query.string == "hello")
+	assert(query.number2 == 4)
+	assert(query.string2 == "world")
+
+	db:removeComponent(id, "string2")
+	query = db:queryEntity(id)
+	assert(query.number == 2)
+	assert(query.string == "hello")
+	assert(query.number2 == 4)
+	assert(query.string2 == nil)
+
+	db:removeComponent(id, "number2")
+	query = db:queryEntity(id)
+	assert(query.number == 2)
+	assert(query.string == "hello")
+	assert(query.number2 == nil)
+	assert(query.string2 == nil)
+
+	db:removeComponent(id, "string")
+	query = db:queryEntity(id)
+	assert(query.number == 2)
+	assert(query.string == nil)
+	assert(query.number2 == nil)
+	assert(query.string2 == nil)
+
+	db:removeComponent(id, "number")
+	query = db:queryEntity(id)
+	assert(query.number == nil)
+	assert(query.string == nil)
+	assert(query.number2 == nil)
+	assert(query.string2 == nil)
+end)
+
+
+test("EntityDb.removeComponent() deletes component table when empty", function()
+	local db = EntityDb()
+	local id1 = db:createEntity()
+	local id2 = db:createEntity()
+	db:addComponent(id1, "number", 2)
+	db:addComponent(id2, "number", 3)
+
+	assert(db.components.number ~= nil)
+	db:removeComponent(id1, "number")
+	assert(db.components.number ~= nil)
+	db:removeComponent(id2, "number")
+	assert(db.components.number == nil)
+end)
+
+
+test("EntityDb.removeComponent() does nothing if the component is not present", function()
+	local db = EntityDb()
+	local id1 = db:createEntity()
+	local id2 = db:createEntity()
+	db:addComponent(id1, "number", 2)
+	db:addComponent(id2, "number", 3)
+
+	assert(db.components.number ~= nil)
+	db:removeComponent(id1, "number")
+	assert(db.components.number ~= nil)
+	db:removeComponent(id1, "number")
+	assert(db.components.number ~= nil)
+
+	db:removeComponent(id2, "number")
+	assert(db.components.number == nil)
+
+end)
+
+
+test("EntityDb.deleteEntity() correctly removes an entity", function()
+	local db = EntityDb()
+	local id1 = db:createEntity()
+	local id2 = db:createEntity()
+	db:addComponent(id1, "number", 2)
+	db:addComponent(id2, "number", 3)
+
+	local query = db:queryComponent("number")
+	assert(query[id1] and query[id2])
+	db:deleteEntity(id1)
+	query = db:queryComponent("number")
+	assert(query[id1] == nil)
+	assert(query[id2] ~= nil)
+
+	assert(false == pcall(function()
+		local query = db:queryEntity(id1)
+	end))
+end)
-- 
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