Wrap erlang tests so they don't print unless they fail

Author: Connor Rigby

README.md

@@ -31,14 +31,24 @@ the command has been added to the command-queue of the thread.
 Since this project was originally an Erlang package, I chose to maintain the
 original module name (as an alias) and it's tests to try to maintain
 backwards compatibility. By default these tests get ran by default.
-`mix test` will execute them.
+
+```bash
+# All the tests without the bench marks.
+mix test
+
+# Run only erlang tests.
+mix test --only esqlite_erlang
+```
 
 # Benchmarks
 There is also a benchmark suite located in the `bench` directory.
 It does not get ran with the test suite since it can take quite a while.
-You can run the benchmarks with
+
 ```bash
+# run all the tests and the benchmarks.
 mix test --include bench
+# run just the benchmark with
+mix test bench --include bench
 ```
 
 # Thanks and License

erl_test/esqlite_test.exs

@@ -0,0 +1,13 @@
+defmodule EsqliteErlangTest do
+  use ExUnit.Case
+  import ExUnit.CaptureIO
+
+  @tag :esqlite_erlang
+  test "Runs Erlang tests" do
+    assert Code.ensure_loaded?(:esqlite_test)
+    output = capture_io(&:esqlite_test.test/0)
+    unless output =~ "tests pass" do
+      flunk(output)
+    end
+  end
+end

erl_test/test_helper.exs

@@ -1,5 +0,0 @@
-:code.ensure_loaded(:esqlite_test)
-case :esqlite_test.test() do
-  :error -> System.halt(1)
-  other -> other
-end