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# rubocop:disable Metrics/AbcSize
# Note: The ABC size is large here because we have a method generating test cases with
# multiple nested contexts. This shouldn't count as a violation.
module CycleAnalyticsHelpers
module TestGeneration
# Generate the most common set of specs that all cycle analytics phases need to have.
#
# Arguments:
#
# phase: Which phase are we testing? Will call `CycleAnalytics.new.send(phase)` for the final assertion
# data_fn: A function that returns a hash, constituting initial data for the test case
# start_time_conditions: An array of `conditions`. Each condition is an tuple of `condition_name` and `condition_fn`. `condition_fn` is called with
# `context` (no lexical scope, so need to do `context.create` for factories, for example) and `data` (from the `data_fn`).
# Each `condition_fn` is expected to implement a case which consitutes the start of the given cycle analytics phase.
# end_time_conditions: An array of `conditions`. Each condition is an tuple of `condition_name` and `condition_fn`. `condition_fn` is called with
# `context` (no lexical scope, so need to do `context.create` for factories, for example) and `data` (from the `data_fn`).
# Each `condition_fn` is expected to implement a case which consitutes the end of the given cycle analytics phase.
# before_end_fn: This function is run before calling the end time conditions. Used for setup that needs to be run between the start and end conditions.
# post_fn: Code that needs to be run after running the end time conditions.
def generate_cycle_analytics_spec(phase:, data_fn:, start_time_conditions:, end_time_conditions:, before_end_fn: nil, post_fn: nil)
combinations_of_start_time_conditions = (1..start_time_conditions.size).flat_map { |size| start_time_conditions.combination(size).to_a }
combinations_of_end_time_conditions = (1..end_time_conditions.size).flat_map { |size| end_time_conditions.combination(size).to_a }
scenarios = combinations_of_start_time_conditions.product(combinations_of_end_time_conditions)
scenarios.each do |start_time_conditions, end_time_conditions|
context "start condition: #{start_time_conditions.map(&:first).to_sentence}" do
context "end condition: #{end_time_conditions.map(&:first).to_sentence}" do
it "finds the median of available durations between the two conditions" do
time_differences = Array.new(5) do |index|
data = data_fn[self]
start_time = (index * 10).days.from_now
end_time = start_time + rand(1..5).days
start_time_conditions.each do |condition_name, condition_fn|
Timecop.freeze(start_time) { condition_fn[self, data] }
end
# Run `before_end_fn` at the midpoint between `start_time` and `end_time`
Timecop.freeze(start_time + (end_time - start_time) / 2) { before_end_fn[self, data] } if before_end_fn
end_time_conditions.each do |condition_name, condition_fn|
Timecop.freeze(end_time) { condition_fn[self, data] }
end
Timecop.freeze(end_time + 1.day) { post_fn[self, data] } if post_fn
end_time - start_time
end
median_time_difference = time_differences.sort[2]
expect(subject[phase].median).to be_within(5).of(median_time_difference)
end
context "when the data belongs to another project" do
let(:other_project) { create(:project, :repository) }
it "returns nil" do
# Use a stub to "trick" the data/condition functions
# into using another project. This saves us from having to
# define separate data/condition functions for this particular
# test case.
allow(self).to receive(:project) { other_project }
data = data_fn[self]
start_time = Time.now
end_time = rand(1..10).days.from_now
start_time_conditions.each do |condition_name, condition_fn|
Timecop.freeze(start_time) { condition_fn[self, data] }
end
end_time_conditions.each do |condition_name, condition_fn|
Timecop.freeze(end_time) { condition_fn[self, data] }
end
Timecop.freeze(end_time + 1.day) { post_fn[self, data] } if post_fn
# Turn off the stub before checking assertions
allow(self).to receive(:project).and_call_original
expect(subject[phase].median).to be_nil
end
end
context "when the end condition happens before the start condition" do
it 'returns nil' do
data = data_fn[self]
start_time = Time.now
end_time = start_time + rand(1..5).days
# Run `before_end_fn` at the midpoint between `start_time` and `end_time`
Timecop.freeze(start_time + (end_time - start_time) / 2) { before_end_fn[self, data] } if before_end_fn
end_time_conditions.each do |condition_name, condition_fn|
Timecop.freeze(start_time) { condition_fn[self, data] }
end
start_time_conditions.each do |condition_name, condition_fn|
Timecop.freeze(end_time) { condition_fn[self, data] }
end
Timecop.freeze(end_time + 1.day) { post_fn[self, data] } if post_fn
expect(subject[phase].median).to be_nil
end
end
end
end
context "start condition NOT PRESENT: #{start_time_conditions.map(&:first).to_sentence}" do
context "end condition: #{end_time_conditions.map(&:first).to_sentence}" do
it "returns nil" do
data = data_fn[self]
end_time = rand(1..10).days.from_now
end_time_conditions.each_with_index do |(condition_name, condition_fn), index|
Timecop.freeze(end_time + index.days) { condition_fn[self, data] }
end
Timecop.freeze(end_time + 1.day) { post_fn[self, data] } if post_fn
expect(subject[phase].median).to be_nil
end
end
end
context "start condition: #{start_time_conditions.map(&:first).to_sentence}" do
context "end condition NOT PRESENT: #{end_time_conditions.map(&:first).to_sentence}" do
it "returns nil" do
data = data_fn[self]
start_time = Time.now
start_time_conditions.each do |condition_name, condition_fn|
Timecop.freeze(start_time) { condition_fn[self, data] }
end
post_fn[self, data] if post_fn
expect(subject[phase].median).to be_nil
end
end
end
end
context "when none of the start / end conditions are matched" do
it "returns nil" do
expect(subject[phase].median).to be_nil
end
end
end
end
end
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