<?xml version="1.0"?>
<!--
  Copyright (C) 2014-2023 Ryan Specialty, LLC.

  This file is part of tame-core.

  tame-core is free software: you can redistribute it and/or modify it
  under the terms of the GNU General Public License as
  published by the Free Software Foundation, either version 3 of the
  License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-->
<package xmlns="http://www.lovullo.com/rater"
  xmlns:c="http://www.lovullo.com/calc"
  xmlns:t="http://www.lovullo.com/rater/apply-template"
  desc="Interpolation specs">

  <import package="../../spec" />

  <import package="../../../base" />
  <import package="../../../vector/length" />


  <t:describe name="_first-nonempty_">
    <t:describe name="given no vectors">
      <t:it desc="yields an empty vector">
        <t:given>
          <c:length-of>
            <t:first-nonempty />
          </c:length-of>
        </t:given>

        <t:expect>
          <t:match-result>
            <c:eq>
              <c:value-of name="#0" />
            </c:eq>
          </t:match-result>
        </t:expect>
      </t:it>
    </t:describe>


    <t:describe name="given only one empty vector">
      <t:it desc="yields an empty vector">
        <t:given>
          <c:length-of>
            <t:first-nonempty>
              <c:vector />
            </t:first-nonempty>
          </c:length-of>
        </t:given>

        <t:expect>
          <t:match-result>
            <c:eq>
              <c:value-of name="#0" />
            </c:eq>
          </t:match-result>
        </t:expect>
      </t:it>
    </t:describe>


    <t:describe name="given only empty vectors">
      <t:it desc="yields an empty vector">
        <t:given>
          <c:length-of>
            <t:first-nonempty>
              <c:vector />
              <c:vector />
            </t:first-nonempty>
          </c:length-of>
        </t:given>

        <t:expect>
          <t:match-result>
            <c:eq>
              <c:value-of name="#0" />
            </c:eq>
          </t:match-result>
        </t:expect>
      </t:it>
    </t:describe>


    <t:describe name="given first empty vector with non-empty">
      <t:it desc="yields the second vector">
        <t:given>
          <c:car>
            <t:first-nonempty>
              <c:vector />
              <c:vector>
                <c:const value="50" desc="Non-empty vector" />
              </c:vector>
            </t:first-nonempty>
          </c:car>
        </t:given>

        <t:expect>
          <t:match-result>
            <c:eq>
              <c:value-of name="#50" />
            </c:eq>
          </t:match-result>
        </t:expect>
      </t:it>
    </t:describe>


    <t:describe name="given two non-empty vectors">
      <t:it desc="yields the first vector">
        <t:given>
          <c:car>
            <t:first-nonempty>
              <c:vector>
                <c:const value="60" desc="Non-empty vector" />
              </c:vector>
              <c:vector>
                <c:const value="70" desc="Non-empty vector" />
              </c:vector>
            </t:first-nonempty>
          </c:car>
        </t:given>

        <t:expect>
          <t:match-result>
            <c:eq>
              <c:value-of name="#60" />
            </c:eq>
          </t:match-result>
        </t:expect>
      </t:it>
    </t:describe>
  </t:describe>
</package>
