feat: initial version of midifi software

This CL introduces the initial version of the midifi software, via
a simplified CLI interface "playsmf".

Though it is far from complete, this version can be manually invoked
with the locations of the MIDI communications port (the `-com` flag),
and MIDI file. It will playback the MIDI file with the correct time.

Software is currently tested with an integration test, that invokes the
program with a known MIDI file and compares the output of the serial
port, standard out, and standard error. Golden files can be updated by
providing the `-test.update-golden` flag.

Change-Id: I312bc721736e2edf385ece5141133ffa6bd20a72
Signed-off-by: Terin Stock <terinjokes@gmail.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/cmd/playsmf/main_test.go b/cmd/playsmf/main_test.go
new file mode 100644
index 0000000..68ee28f
--- /dev/null
+++ b/cmd/playsmf/main_test.go
@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"testing"
+
+	"github.com/pkg/term/termios"
+	"gotest.tools/golden"
+)
+
+func TestMain(m *testing.M) {
+	switch os.Getenv("GOTESTMODE") {
+	case "main":
+		// run the normal main function
+		main()
+	default:
+		os.Exit(m.Run())
+	}
+}
+
+func TestCLI(t *testing.T) {
+	pty, tty, err := termios.Pty()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer pty.Close()
+
+	cmd := exec.Command(os.Args[0], "-com", tty.Name(), "./testdata/ceottk.mid")
+	cmd.Env = append(os.Environ(), "GOTESTMODE=main")
+
+	output, err := cmd.Output()
+	if err != nil {
+		fmt.Printf("output: %s\n", string(output))
+		t.Fatal(err)
+	}
+
+	tty.Close()
+	b, err := ioutil.ReadAll(pty)
+	if err != nil && err.Error() != "read ptm: input/output error" {
+		t.Errorf("error reading pty: %+v", err)
+	}
+
+	golden.AssertBytes(t, b, "ceottk-serial.golden.bin")
+	golden.Assert(t, string(output), "ceottk-output.golden")
+}