1 files changed, 73 insertions, 0 deletions
diff --git a/internal/session/spec_test.go b/internal/session/spec_test.go
new file mode 100644
index 0000000..182c517
--- /dev/null
+++ b/internal/session/spec_test.go
@@ -0,0 +1,73 @@
+package session
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"reflect"
+	"strings"
+	"testing"
+
+	"github.com/mimecast/dtail/internal/omode"
+)
+
+func TestSpecStartCommandEncodesPayload(t *testing.T) {
+	t.Parallel()
+
+	spec := Spec{
+		Mode:    omode.TailClient,
+		Files:   []string{"/var/log/app.log"},
+		Options: "plain=true",
+		Regex:   "ERROR",
+		Timeout: 15,
+	}
+
+	command, err := spec.StartCommand()
+	if err != nil {
+		t.Fatalf("StartCommand() error = %v", err)
+	}
+	if !strings.HasPrefix(command, "SESSION START ") {
+		t.Fatalf("unexpected start command prefix: %q", command)
+	}
+
+	var decoded Spec
+	if err := decodeSpecPayload(strings.TrimPrefix(command, "SESSION START "), &decoded); err != nil {
+		t.Fatalf("decode start payload: %v", err)
+	}
+	if !reflect.DeepEqual(decoded, spec) {
+		t.Fatalf("unexpected decoded spec: got %#v want %#v", decoded, spec)
+	}
+}
+
+func TestSpecUpdateCommandIncludesGeneration(t *testing.T) {
+	t.Parallel()
+
+	spec := Spec{
+		Mode:  omode.MapClient,
+		Files: []string{"/var/log/app.log"},
+		Query: "from STATS select count(*)",
+	}
+
+	command, err := spec.UpdateCommand(7)
+	if err != nil {
+		t.Fatalf("UpdateCommand() error = %v", err)
+	}
+	if !strings.HasPrefix(command, "SESSION UPDATE 7 ") {
+		t.Fatalf("unexpected update command prefix: %q", command)
+	}
+
+	var decoded Spec
+	if err := decodeSpecPayload(strings.TrimPrefix(command, "SESSION UPDATE 7 "), &decoded); err != nil {
+		t.Fatalf("decode update payload: %v", err)
+	}
+	if !reflect.DeepEqual(decoded, spec) {
+		t.Fatalf("unexpected decoded spec: got %#v want %#v", decoded, spec)
+	}
+}
+
+func decodeSpecPayload(payload string, out *Spec) error {
+	raw, err := base64.StdEncoding.DecodeString(payload)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(raw, out)
+}