Add an RCF that uses t.d.a. add-lib to load test deps

This makes it easier for me to develop and test `next.jdbc` in the same 
REBL setup I use for World Singles Networks development.

test/next/jdbc/test_fixtures.clj

@@ -126,3 +126,21 @@ CREATE TABLE " fruit " (
                             ["Orange" "juicy" 89 88.6]]
                            {:return-keys false})
         (t)))))
+
+(comment
+  ;; this is a convenience to bring next.jdbc's test dependencies
+  ;; into any REPL that has the add-lib branch of tools.deps.alpha
+  ;; which allows me to develop and test next.jdbc inside my work's
+  ;; "everything" REBL environment
+  (require '[clojure.tools.deps.alpha.repl :refer [add-lib]]
+           '[clojure.java.io :as io]
+           '[clojure.edn :as edn])
+  (def repo-path "/Developer/workspace/next.jdbc")
+  (def test-deps (-> (io/reader (str repo-path "/deps.edn"))
+                     (java.io.PushbackReader.)
+                     (edn/read)
+                     :aliases
+                     :test
+                     :extra-deps))
+  (doseq [[coord version] test-deps]
+    (add-lib coord version)))