Renaming test files according to their language (#3407)

test/tw-1688.test.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+. bash_tap_tw.sh
+
+# TW-1688 task fails to import
+#   The problem is when a completed task, with a dependency is exported, then
+#   imported after the data is removed. On import, the circular dependency
+#   check didn't notice that a UUID failed to exist, and generated a JSON error.
+#
+#   Although an unusual circumstance, people do delete data from their
+#   completed.data file.
+
+task add one
+task log two depends:1
+
+task /two/ export > JSON
+
+rm taskchampion.sqlite3
+task import JSON