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+#!/usr/bin/env bash
+
+# gallery.sh Test Script
+#
+# https://github.com/lehmannro/assert.sh
+
+if [ ! -e assert.sh ]; then
+	echo "downloading unit test script"
+	curl -f "https://raw.githubusercontent.com/lehmannro/assert.sh/v1.1/assert.sh" -o assert.sh
+fi
+
+# Copy demo files
+cp images/demo/* ./
+
+# shellcheck disable=SC1091
+source assert.sh
+
+# `echo test` is expected to write "test" on stdout
+assert "echo test" "test"
+# `seq 3` is expected to print "1", "2" and "3" on different lines
+assert "seq 3" "1\\n2\\n3"
+# exit code of `true` is expected to be 0
+assert_raises "true"
+# exit code of `false` is expected to be 1
+assert_raises "false" 1
+# end of test suite
+assert_end examples
+
+# $ bash gallery.sh -t Test
+assert_raises "bash gallery.sh -t Test"
+
+assert "cat index.html | grep '<title>Test</title>' | tr -d '\011\012\015'" '<title>Test</title>'
+assert "cat index.html | grep '__thumbs/Landscape_1.jpg.html' | tr -d '\011\012\015'" '<a href="__thumbs/Landscape_1.jpg.html"><img src="__thumbs/187/Landscape_1.jpg" alt="Thumbnail: Landscape_1.jpg" class="rounded mx-auto d-block"></a>'
+
+assert "cat __thumbs/Landscape_1.jpg.html | grep '<title>Landscape_1.jpg</title>' | tr -d '\011\012\015'" '<title>Landscape_1.jpg</title>'
+assert "cat __thumbs/Landscape_1.jpg.html | grep 'Resolution' | tr -d '\040\011\012\015'" 'Resolution:600x450'
+
+assert_end gallery_sh