#6 implement negative test

test/epgsql_migrations_SUITE.erl

@@ -83,7 +83,19 @@ incremental_migration_test(Opts) ->
        {ok, _,[{<<"1">>}]},
        epgsql:squery(Conn, "select count(*) from fruit where color = 'yellow'")).
 
-wrong_initial_version_test(_Opts) -> ok.
+wrong_initial_version_test(Opts) ->
+    Conn = ?config(conn, Opts),
+    PreparedCall = engine:migrate(
+                     filename:join([?config(data_dir, Opts), "02-wrong-initial-version"]),
+                     fun(F) ->
+                             epgsql:with_transaction(Conn, fun(_) -> F() end)
+                     end,
+                     epgsql_query_fun(Conn)
+                    ),
+    ?assertEqual(
+       {rollback, {badmatch, {error, unexpected_version, {expected, 0, supplied, 20}}}},
+       PreparedCall()).
+
 migration_gap_test(_Opts) -> ok.
 transactional_migration_test(_Opts) -> ok.
 

test/epgsql_migrations_SUITE_data/02-wrong-initial-version/20_initial_version.sql

@@ -0,0 +1,7 @@
+CREATE TABLE fruit (
+ id SERIAL,
+ name TEXT NOT NULL
+);
+INSERT INTO fruit (name) VALUES (
+    'apple'
+);

test/epgsql_migrations_SUITE_data/03-migration-gap/00_initial_version.sql

@@ -0,0 +1,7 @@
+CREATE TABLE fruit (
+ id SERIAL,
+ name TEXT NOT NULL
+);
+INSERT INTO fruit (name) VALUES (
+    'apple'
+);

test/epgsql_migrations_SUITE_data/03-migration-gap/02_gap_version.sql

@@ -0,0 +1,5 @@
+ALTER TABLE fruit
+    ADD COLUMN color TEXT NOT NULL DEFAULT 'green';
+INSERT INTO fruit (name, color) VALUES (
+    'lemon', 'yellow'
+);