Moonshark/tests/json.lua

#!/usr/bin/env moonshark

-- Test script for JSON module functionality
local json = require("json")

local passed = 0
local total = 0

local function test(name, fn)
	print("Testing " .. name .. "...")
	total = total + 1
	local ok, err = pcall(fn)
	if ok then
		passed = passed + 1
		print("  ✓ PASS")
		return true
	else
		print("  ✗ FAIL: " .. err)
		return false
	end
end

-- Test data
local test_data = {
	name = "John Doe",
	age = 30,
	active = true,
	scores = {85, 92, 78, 90},
	address = {
		street = "123 Main St",
		city = "Springfield",
		zip = "12345"
	},
	tags = {"developer", "golang", "lua"}
}

-- Test 1: Basic encoding
test("Basic JSON Encoding", function()
	local encoded = json.encode(test_data)
	assert(type(encoded) == "string", "encode should return string")
	assert(string.find(encoded, "John Doe"), "should contain name")
	assert(string.find(encoded, "30"), "should contain age")
end)

-- Test 2: Basic decoding
test("Basic JSON Decoding", function()
	local encoded = json.encode(test_data)
	local decoded = json.decode(encoded)
	assert(decoded.name == "John Doe", "name should match")
	assert(decoded.age == 30, "age should match")
	assert(decoded.active == true, "active should be true")
	assert(#decoded.scores == 4, "scores array length should be 4")
end)

-- Test 3: Round-trip encoding/decoding
test("Round-trip Encoding/Decoding", function()
	local encoded = json.encode(test_data)
	local decoded = json.decode(encoded)
	local re_encoded = json.encode(decoded)
	local re_decoded = json.decode(re_encoded)
	
	assert(re_decoded.name == test_data.name, "name should survive round-trip")
	assert(re_decoded.address.city == test_data.address.city, "nested data should survive")
end)

-- Test 4: Pretty printing
test("Pretty Printing", function()
	local pretty = json.pretty(test_data)
	assert(type(pretty) == "string", "pretty should return string")
	assert(string.find(pretty, "\n"), "pretty should contain newlines")
	assert(string.find(pretty, "  "), "pretty should contain indentation")
	
	-- Should still be valid JSON
	local decoded = json.decode(pretty)
	assert(decoded.name == test_data.name, "pretty JSON should still decode correctly")
end)

-- Test 5: Object merging
test("Object Merging", function()
	local obj1 = {a = 1, b = 2}
	local obj2 = {b = 3, c = 4}
	local obj3 = {d = 5}
	
	local merged = json.merge(obj1, obj2, obj3)
	assert(merged.a == 1, "should preserve a from obj1")
	assert(merged.b == 3, "should use b from obj2 (later wins)")
	assert(merged.c == 4, "should include c from obj2")
	assert(merged.d == 5, "should include d from obj3")
end)

-- Test 6: Data extraction
test("Data Extraction", function()
	local name = json.extract(test_data, "name")
	assert(name == "John Doe", "should extract name")
	
	local city = json.extract(test_data, "address.city")
	assert(city == "Springfield", "should extract nested city")
	
	local first_score = json.extract(test_data, "scores.[0]")
	assert(first_score == 85, "should extract array element")
	
	local missing = json.extract(test_data, "nonexistent.field")
	assert(missing == nil, "should return nil for missing path")
end)

-- Test 7: Schema validation
test("Schema Validation", function()
	local schema = {
		type = "table",
		properties = {
			name = {type = "string"},
			age = {type = "number"},
			active = {type = "boolean"}
		},
		required = {name = true, age = true}
	}
	
	local valid, err = json.validate(test_data, schema)
	assert(valid == true, "test_data should be valid")
	
	local invalid_data = {name = "John", age = "not_a_number"}
	local invalid, err2 = json.validate(invalid_data, schema)
	assert(invalid == false, "invalid_data should fail validation")
	assert(type(err2) == "string", "should return error message")
end)

-- Test 8: File operations
test("File Save/Load", function()
	local filename = "test_output.json"
	
	-- Save to file
	json.save_file(filename, test_data, true) -- pretty format
	
	-- Check file exists
	assert(moonshark.file_exists(filename), "file should exist after save")
	
	-- Load from file
	local loaded = json.load_file(filename)
	assert(loaded.name == test_data.name, "loaded data should match original")
	assert(loaded.address.zip == test_data.address.zip, "nested data should match")
	
	-- Clean up
	os.remove(filename)
end)

-- Test 9: Error handling
test("Error Handling", function()
	-- Invalid JSON should throw error
	local success, err = pcall(json.decode, '{"invalid": json}')
	assert(success == false, "invalid JSON should cause error")
	assert(type(err) == "string", "should return error message")
	
	-- Missing file should throw error  
	local success2, err2 = pcall(json.load_file, "nonexistent_file.json")
	assert(success2 == false, "missing file should cause error")
	assert(type(err2) == "string", "should return error message")
end)

-- Test 10: Edge cases
test("Edge Cases", function()
	-- Empty objects
	local empty_obj = {}
	local encoded_empty = json.encode(empty_obj)
	local decoded_empty = json.decode(encoded_empty)
	assert(type(decoded_empty) == "table", "empty object should decode to table")
	
	-- Null values
	local with_nil = {a = 1, b = nil, c = 3}
	local encoded_nil = json.encode(with_nil)
	local decoded_nil = json.decode(encoded_nil)
	-- Note: nil values are typically omitted in JSON
	
	-- Special numbers
	local special = {
		zero = 0,
		negative = -42,
		decimal = 3.14159
	}
	local encoded_special = json.encode(special)
	local decoded_special = json.decode(encoded_special)
	assert(decoded_special.zero == 0, "zero should encode/decode correctly")
	assert(decoded_special.negative == -42, "negative should encode/decode correctly")
	assert(math.abs(decoded_special.decimal - 3.14159) < 0.00001, "decimal should encode/decode correctly")
end)

-- Performance test
test("Performance Test", function()
	local large_data = {}
	for i = 1, 1000 do
		large_data[i] = {
			id = i,
			name = "User " .. i,
			data = {x = i * 2, y = i * 3, z = i * 4}
		}
	end
	
	local start = os.clock()
	local encoded = json.encode(large_data)
	local encode_time = os.clock() - start
	
	start = os.clock()
	local decoded = json.decode(encoded)
	local decode_time = os.clock() - start
	
	print(string.format("  Encoded 1000 objects in %.3f seconds", encode_time))
	print(string.format("  Decoded 1000 objects in %.3f seconds", decode_time))
	
	assert(#decoded == 1000, "should have 1000 objects after decode")
	assert(decoded[500].name == "User 500", "data should be intact")
end)

print("=" .. string.rep("=", 50))
print(string.format("Test Results: %d/%d passed", passed, total))
if passed == total then
	print("🎉 All tests passed!")
	os.exit(0)
else
	print("❌ Some tests failed!")
	os.exit(1)
end