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require 'test_helper'
class RevisionsHelperTest < ActionView::TestCase
class RevisionSet
def initialize revisions
@revisions = revisions
end
def pages
self
end
def exists? conditions
@revisions.include?(conditions[:revision])
end
end
def node_with *revisions
RevisionSet.new(revisions)
end
test "a forward pair offers both neighbours in forward orientation" do
assert_equal [[2, 3], [4, 5]],
neighbour_revision_pairs(node_with(1, 2, 3, 4, 5), 3, 4)
end
test "a reverse pair offers both neighbours in reverse orientation" do
assert_equal [[3, 2], [5, 4]],
neighbour_revision_pairs(node_with(1, 2, 3, 4, 5), 4, 3)
end
test "the earliest pair has no earlier neighbour" do
assert_equal [nil, [2, 3]],
neighbour_revision_pairs(node_with(1, 2, 3), 1, 2)
end
test "the latest pair has no later neighbour" do
assert_equal [[1, 2], nil],
neighbour_revision_pairs(node_with(1, 2, 3), 2, 3)
end
test "a layer comparison offers no neighbours" do
assert_equal [nil, nil],
neighbour_revision_pairs(node_with(1, 2, 3), "head", "draft")
end
test "mixing a layer with a number offers no neighbours" do
assert_equal [nil, nil],
neighbour_revision_pairs(node_with(1, 2, 3), "head", 3)
end
test "a non-adjacent pair offers no neighbours" do
assert_equal [nil, nil],
neighbour_revision_pairs(node_with(1, 2, 3, 4, 5), 2, 5)
end
# The controller sets both ends to 1 when a node has a single page.
test "a revision compared against itself offers no neighbours" do
assert_equal [nil, nil], neighbour_revision_pairs(node_with(1), 1, 1)
end
test "string references are accepted, since they arrive from the query string" do
assert_equal [[1, 2], nil],
neighbour_revision_pairs(node_with(1, 2, 3), "2", "3")
end
# Revision numbers are contiguous today. Should that stop being true, the
# control disables rather than pointing at a revision that is not there.
test "a gap disables the control rather than skipping over it" do
assert_equal [nil, [5, 6]],
neighbour_revision_pairs(node_with(1, 2, 4, 5, 6), 4, 5)
end
end
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