write plt-build test wrapper

cmd/plt-build/main_test.go

@@ -1 +1,19 @@
 package plt_build
+
+import (
+	"os"
+	"os/exec"
+	"testing"
+	"time"
+)
+
+func TestPltBuild(t *testing.T) {
+	cmd := exec.CommandContext(t.Context(), "./gradlew", "test")
+	cmd.WaitDelay = 100 * time.Millisecond
+	cmd.Stdin, cmd.Stdout, cmd.Stderr = os.Stdin, os.Stdout, os.Stderr
+	err := cmd.Run()
+
+	if err != nil {
+		t.Error(err)
+	}
+}