Add some model tests

test/sample/models/avatar_test.clj

+(ns sample.models.avatar-test
+  (:require
+   [clojure.test :refer [deftest is]]
+   [sample.models.avatar :as subject]))
+
+(deftest create-avatar-test
+  (is (not= nil
+         (:id (subject/create-avatar {:user_id 1, :name "test.jpg"})))))
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test/sample/models/user_test.clj

+(ns sample.models.user-test
+  (:require
+   [clojure.test :refer [deftest is]]
+   [sample.features.helpers :refer :all]
+   [sample.models.user :as subject]))
+
+(deftest get-user-by-email-test
+  (create-user)
+  (is (not= nil
+         (subject/get-user-by-email foo-email))))
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