Make test databases in memory

project.clj

@@ -82,7 +82,7 @@
              :expectations {:injections [(require 'metabase.test-setup)]
                             :resource-paths ["test_resources"]
                             :env {:mb-test-setting-1 "ABCDEFG"}
-                            :jvm-opts ["-Dmb.db.file=target/metabase-test"
+                            :jvm-opts ["-Dmb.db.in.memory=true"
                                        "-Dmb.jetty.join=false"
                                        "-Dmb.jetty.port=3010"
                                        "-Dmb.api.key=test-api-key"

src/metabase/db.clj

@@ -16,17 +16,23 @@
 
 ;; ## DB FILE, JDBC/KORMA DEFINITONS
 
-(defn db-file
+(def db-file
   "Path to our H2 DB file from env var or app config."
-  []
-  (let [db-file-name (config/config-str :mb-db-file)
-        db-file (clojure.java.io/file db-file-name)
-        options ";AUTO_SERVER=TRUE;MV_STORE=FALSE;DB_CLOSE_DELAY=-1"] ; see http://h2database.com/html/features.html for explanation of options
-    (if (.isAbsolute db-file)
-      ;; when an absolute path is given for the db file then don't mess with it
-      (str "file:" db-file-name options)
-      ;; if we don't have an absolute path then make sure we start from "user.dir"
-      (str "file:" (str (System/getProperty "user.dir") "/" db-file-name options)))))
+  (memoize
+   (fn []
+     ;; see http://h2database.com/html/features.html for explanation of options
+     (if (config/config-bool :mb-db-in-memory)
+       ;; In-memory (i.e. test) DB
+       "mem:metabase;DB_CLOSE_DELAY=-1"
+       ;; File-based DB
+       (let [db-file-name (config/config-str :mb-db-file)
+             db-file      (clojure.java.io/file db-file-name)
+             options      ";AUTO_SERVER=TRUE;MV_STORE=FALSE;DB_CLOSE_DELAY=-1"]
+         (apply str "file:" (if (.isAbsolute db-file)
+                              ;; when an absolute path is given for the db file then don't mess with it
+                              [db-file-name options]
+                              ;; if we don't have an absolute path then make sure we start from "user.dir"
+                              [(System/getProperty "user.dir") "/" db-file-name options])))))))
 
 
 (defn setup-jdbc-db

test/metabase/test/data/h2.clj

@@ -34,9 +34,11 @@
 (defn- connection-details
   "Return a Metabase `Database.details` for H2 database defined by DATABASE-DEFINITION."
   [^DatabaseDefinition {:keys [short-lived?], :as database-definition}]
-  {:db (format (if short-lived? "file:%s" ; for short-lived connections don't create a server thread and don't use a keep-alive connection
-                   "file:%s;AUTO_SERVER=TRUE;DB_CLOSE_DELAY=-1")
-               (filename database-definition))
+  {:db (format (if short-lived?
+                 ;; for so-called 'short-lived' (temp) DBs create them in-memory
+                 "mem:%s"
+                 "file:%s;AUTO_SERVER=TRUE;DB_CLOSE_DELAY=-1")
+        (filename database-definition))
    :short-lived? short-lived?})
 
 (defn- korma-connection-pool