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require 'yaml'
require 'nenv/environment'
RSpec.describe Nenv::Environment do
class MockEnv < Hash # a hash is close enough
def []=(k, v)
fail TypeError, "no implicit conversion of #{k.class} into String" unless k.respond_to? :to_str
fail TypeError, "no implicit conversion of #{v.class} into String" unless v.respond_to? :to_str
super(k.to_str, v.to_str)
end
end
before { stub_const('ENV', MockEnv.new) }
subject { instance }
shared_examples 'accessor methods' do
describe 'predicate method' do
before { subject.create_method(:foo?) }
it 'responds to it' do
expect(subject).to respond_to(:foo?)
end
context 'when the method already exists' do
let(:error) { described_class::AlreadyExistsError }
let(:message) { 'Method :foo? already exists' }
specify do
expect do
subject.create_method(:foo?)
end.to raise_error(error, message)
end
end
context 'with value stored in ENV' do
before { ENV[sample_key] = value }
describe 'when value is truthy' do
let(:value) { 'true' }
it 'should return true' do
expect(subject.foo?).to eq true
end
end
describe 'when value is falsey' do
let(:value) { '0' }
it 'should return false' do
expect(subject.foo?).to eq false
end
end
end
end
describe 'reader method' do
context 'when added' do
before { subject.create_method(:foo) }
it 'responds to it' do
expect(subject).to respond_to(:foo)
end
context 'when the method already exists' do
let(:error) { described_class::AlreadyExistsError }
let(:message) { 'Method :foo already exists' }
specify do
expect do
subject.create_method(:foo)
end.to raise_error(error, message)
end
end
end
context 'with value stored in ENV' do
before { ENV[sample_key] = value }
context 'with no block' do
before { instance.create_method(:foo) }
let(:value) { '123' }
it 'returns marshalled stored value' do
expect(subject.foo).to eq '123'
end
end
context 'with block' do
before { instance.create_method(:foo) { |data| YAML.load(data) } }
let(:value) { "---\n:foo: 5\n" }
it 'returns unmarshalled stored value' do
expect(subject.foo).to eq(foo: 5)
end
end
end
end
describe 'writer method' do
context 'when added' do
before { subject.create_method(:foo=) }
it 'responds to it' do
expect(subject).to respond_to(:foo=)
end
context 'when the method already exists' do
let(:error) { described_class::AlreadyExistsError }
let(:message) { 'Method :foo= already exists' }
specify do
expect do
subject.create_method(:foo=)
end.to raise_error(error, message)
end
end
end
describe 'env variable' do
after { expect(ENV[sample_key]).to eq result }
context 'with no block' do
before { subject.create_method(:foo=) }
let(:result) { '123' }
it 'stores a converted to string value' do
subject.foo = 123
end
end
context 'with block' do
before { subject.create_method(:foo=) { |data| YAML.dump(data) } }
let(:result) { "---\n:foo: 5\n" }
it 'stores a marshaled value' do
subject.foo = { foo: 5 }
end
end
end
end
end
context 'with no namespace' do
let(:instance) { described_class.new }
let(:sample_key) { 'FOO' }
include_examples 'accessor methods'
end
context 'with any namespace' do
let(:namespace) { 'bar' }
let(:sample_key) { 'BAR_FOO' }
let(:instance) { described_class.new(namespace) }
include_examples 'accessor methods'
context 'with a method containing underscores' do
before { instance.create_method(:foo_baz) }
it 'reads the correct variable' do
ENV['BAR_FOO_BAZ'] = '123'
expect(subject.foo_baz).to eq '123'
end
end
end
end
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