wm/tests.sql

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create schema if not exists test;
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\i wm.sql
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-- https://stackoverflow.com/questions/19982373/which-tools-libraries-do-you-use-to-unit-test-your-pl-pgsql
CREATE OR REPLACE FUNCTION assert_equals(expected anyelement, actual anyelement) RETURNS void AS $$
begin
if expected = actual or (expected is null and actual is null) then
--do nothing
else
raise exception 'Assertion Error. Expected <%> but was <%>', expected, actual;
end if;
end $$ LANGUAGE plpgsql;
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drop table if exists figures;
create table figures (name text, way geometry);
insert into figures (name, way) values ('fig3', ST_GeomFromText('LINESTRING(0 0, 12 0, 13 4, 20 2, 20 0, 32 0, 33 10, 38 16, 43 15, 44 10, 44 0, 60 0)'));
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insert into figures (name, way) values ('fig3-1', ST_GeomFromText('LINESTRING(0 0, 12 0, 13 4, 20 2, 20 0, 32 0, 33 10, 38 16, 43 15, 44 10, 44 0)'));
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insert into figures (name, way) values ('fig5', ST_GeomFromText('LINESTRING(0 39,19 52,27 77,26 104,41 115,49 115,65 103,65 75,53 45,63 15,91 0,91 0)'));
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do $$
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declare
bends geometry[];
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begin
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perform assert_equals(3, array_length(detect_bends((select way from figures where name='fig3')), 1));
perform assert_equals(3, array_length(detect_bends((select way from figures where name='fig3-1')), 1));
select detect_bends((select way from figures where name='fig5')) into bends;
perform assert_equals(2, array_length(bends, 1));
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end $$ language plpgsql;