59 lines
2.3 KiB
Crystal
59 lines
2.3 KiB
Crystal
require "./example_group"
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require "./example_group_builder"
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require "./example_group_iteration"
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require "./location"
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require "./metadata"
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module Spectator
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# Progressively constructs an iterative example group.
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# Hooks and builders for child nodes can be added over time to this builder.
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# When done, call `#build` to produce an `ExampleGroup` with nested `ExampleGroupIteration` instances.
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class IterativeExampleGroupBuilder(T) < ExampleGroupBuilder
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# Creates the builder.
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# Initially, the builder will have no children and no hooks.
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# The *name*, *location*, and *metadata* will be applied to the `ExampleGroup` produced by `#build`.
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# The *collection* is the set of items to create sub-nodes for.
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# The *iterators* is a list of optional names given to items in the collection.
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def initialize(@collection : Enumerable(T), name : String? = nil, @iterators : Array(String) = [] of String,
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location : Location? = nil, metadata : Metadata? = nil)
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super(name, location, metadata)
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end
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# Constructs an iterative example group with previously defined attributes, children, and hooks.
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# The *parent* is an already constructed example group to nest the new example group under.
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# It can be nil if the new example group won't have a parent.
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def build(parent = nil)
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ExampleGroup.new(@name, @location, parent, @metadata).tap do |group|
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# Hooks are applied once to the outer group,
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# instead of multiple times for each inner group (iteration).
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apply_hooks(group)
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@collection.each do |item|
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ExampleGroupIteration.new(item, iteration_name(item), @location, group).tap do |iteration|
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@children.each(&.build(iteration))
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end
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end
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end
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end
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# Constructs the name of an example group iteration.
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private def iteration_name(item)
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if item.is_a?(Tuple) && @iterators.size > 1
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item.zip?(@iterators).map do |(subitem, iterator)|
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if iterator
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"#{iterator}: #{subitem.inspect}"
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else
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subitem.inspect
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end
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end.join("; ")
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else
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if iterator = @iterators.first?
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"#{iterator}: #{item.inspect}"
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else
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item.inspect
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end
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end
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end
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end
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end
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