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local Result = require "mason-core.result"
local match = require "luassert.match"
local spy = require "luassert.spy"
local Optional = require "mason-core.optional"
describe("result", function()
it("should create success", function()
local result = Result.success "Hello!"
assert.is_true(result:is_success())
assert.is_false(result:is_failure())
assert.equals("Hello!", result:get_or_nil())
end)
it("should create failure", function()
local result = Result.failure "Hello!"
assert.is_true(result:is_failure())
assert.is_false(result:is_success())
assert.equals("Hello!", result:err_or_nil())
end)
it("should return value on get_or_throw()", function()
local result = Result.success "Hello!"
local val = result:get_or_throw()
assert.equals("Hello!", val)
end)
it("should throw failure on get_or_throw()", function()
local result = Result.failure "Hello!"
local err = assert.has_error(function()
result:get_or_throw()
end)
assert.equals("Hello!", err)
end)
it("should map() success", function()
local result = Result.success "Hello"
local mapped = result:map(function(x)
return x .. " World!"
end)
assert.equals("Hello World!", mapped:get_or_nil())
assert.is_nil(mapped:err_or_nil())
end)
it("should not map() failure", function()
local result = Result.failure "Hello"
local mapped = result:map(function(x)
return x .. " World!"
end)
assert.equals("Hello", mapped:err_or_nil())
assert.is_nil(mapped:get_or_nil())
end)
it("should raise exceptions in map()", function()
local result = Result.success "failure"
local err = assert.has_error(function()
result:map(function()
error "error"
end)
end)
assert.equals("error", err)
end)
it("should map_catching() success", function()
local result = Result.success "Hello"
local mapped = result:map_catching(function(x)
return x .. " World!"
end)
assert.equals("Hello World!", mapped:get_or_nil())
assert.is_nil(mapped:err_or_nil())
end)
it("should not map_catching() failure", function()
local result = Result.failure "Hello"
local mapped = result:map_catching(function(x)
return x .. " World!"
end)
assert.equals("Hello", mapped:err_or_nil())
assert.is_nil(mapped:get_or_nil())
end)
it("should catch errors in map_catching()", function()
local result = Result.success "value"
local mapped = result:map_catching(function()
error "This is an error"
end)
assert.is_false(mapped:is_success())
assert.is_true(mapped:is_failure())
assert.is_true(match.has_match "This is an error$"(mapped:err_or_nil()))
end)
it("should recover errors", function()
local result = Result.failure("call an ambulance"):recover(function(err)
return err .. ". but not for me!"
end)
assert.is_true(result:is_success())
assert.equals("call an ambulance. but not for me!", result:get_or_nil())
end)
it("should catch errors in recover", function()
local result = Result.failure("call an ambulance"):recover_catching(function(err)
error("Oh no... " .. err, 2)
end)
assert.is_true(result:is_failure())
assert.equals("Oh no... call an ambulance", result:err_or_nil())
end)
it("should return results in run_catching", function()
local result = Result.run_catching(function()
return "Hello world!"
end)
assert.is_true(result:is_success())
assert.equals("Hello world!", result:get_or_nil())
end)
it("should return failures in run_catching", function()
local result = Result.run_catching(function()
error("Oh noes", 2)
end)
assert.is_true(result:is_failure())
assert.equals("Oh noes", result:err_or_nil())
end)
it("should run on_failure if failure", function()
local on_success = spy.new()
local on_failure = spy.new()
local result = Result.failure("Oh noes"):on_failure(on_failure):on_success(on_success)
assert.is_true(result:is_failure())
assert.equals("Oh noes", result:err_or_nil())
assert.spy(on_failure).was_called(1)
assert.spy(on_success).was_called(0)
assert.spy(on_failure).was_called_with "Oh noes"
end)
it("should run on_success if success", function()
local on_success = spy.new()
local on_failure = spy.new()
local result = Result.success("Oh noes"):on_failure(on_failure):on_success(on_success)
assert.is_true(result:is_success())
assert.equals("Oh noes", result:get_or_nil())
assert.spy(on_failure).was_called(0)
assert.spy(on_success).was_called(1)
assert.spy(on_success).was_called_with "Oh noes"
end)
it("should convert success variants to non-empty optionals", function()
local opt = Result.success("Hello world!"):ok()
assert.is_true(getmetatable(opt) == Optional)
assert.equals("Hello world!", opt:get())
end)
it("should convert failure variants to empty optionals", function()
local opt = Result.failure("Hello world!"):ok()
assert.is_true(getmetatable(opt) == Optional)
assert.is_false(opt:is_present())
end)
it("should chain successful results", function()
local success = Result.success("First"):and_then(function(value)
return Result.success(value .. " Second")
end)
local failure = Result.success("Error"):and_then(Result.failure)
assert.is_true(success:is_success())
assert.equals("First Second", success:get_or_nil())
assert.is_true(failure:is_failure())
assert.equals("Error", failure:err_or_nil())
end)
it("should not chain failed results", function()
local chain = spy.new()
local failure = Result.failure("Error"):and_then(chain)
assert.is_true(failure:is_failure())
assert.equals("Error", failure:err_or_nil())
assert.spy(chain).was_not_called()
end)
it("should chain failed results", function()
local failure = Result.failure("First"):or_else(function(value)
return Result.failure(value .. " Second")
end)
local success = Result.failure("Error"):or_else(Result.success)
assert.is_true(success:is_success())
assert.equals("Error", success:get_or_nil())
assert.is_true(failure:is_failure())
assert.equals("First Second", failure:err_or_nil())
end)
it("should not chain successful results", function()
local chain = spy.new()
local failure = Result.success("Error"):or_else(chain)
assert.is_true(failure:is_success())
assert.equals("Error", failure:get_or_nil())
assert.spy(chain).was_not_called()
end)
end)
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