update elements and fix some bugs

lib/src/prism/tests/languages/rest/substitution-def_feature.test

Index: lib/src/prism/tests/languages/rest/substitution-def_feature.test
diff --git a/lib/src/prism/tests/languages/rest/substitution-def_feature.test b/lib/src/prism/tests/languages/rest/substitution-def_feature.test
new file mode 100644
index 0000000000000000000000000000000000000000..69436da78bc146ed9b6b86315f21c020cd79f60b
--- /dev/null
+++ b/lib/src/prism/tests/languages/rest/substitution-def_feature.test
@@ -0,0 +1,69 @@
+.. |biohazard| image:: biohazard.png
+.. |Red light| image:: red_light.png
+
+.. |Michael| user:: mjones
+.. |Jon|     user:: jhl
+
+----------------------------------------------------
+
+[
+	["punctuation", ".."],
+	["substitution-def", [
+		["substitution", [
+			["punctuation", "|"],
+			"biohazard",
+			["punctuation", "|"]
+		]],
+		["directive", [
+			"image",
+			["punctuation", "::"]
+		]]
+	]],
+	" biohazard.png\r\n",
+
+	["punctuation", ".."],
+	["substitution-def", [
+		["substitution", [
+			["punctuation", "|"],
+			"Red light",
+			["punctuation", "|"]
+		]],
+		["directive", [
+			"image",
+			["punctuation", "::"]
+		]]
+	]],
+	" red_light.png\r\n\r\n",
+
+	["punctuation", ".."],
+	["substitution-def", [
+		["substitution", [
+			["punctuation", "|"],
+			"Michael",
+			["punctuation", "|"]
+		]],
+		["directive", [
+			"user",
+			["punctuation", "::"]
+		]]
+	]],
+	" mjones\r\n",
+
+	["punctuation", ".."],
+	["substitution-def", [
+		["substitution", [
+			["punctuation", "|"],
+			"Jon",
+			["punctuation", "|"]
+		]],
+		["directive", [
+			"user",
+			["punctuation", "::"]
+		]]
+	]],
+	" jhl"
+]
+
+----------------------------------------------------
+
+Checks for substitution definitions.