test(osiris): test osiris features and ensure it works

Signed-off-by: Xe Iaso <me@xeiaso.net>

cmd/osiris/internal/entrypoint/entrypoint_test.go

@@ -0,0 +1,93 @@
+package entrypoint
+
+import (
+	"context"
+	"errors"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestMainGoodConfig(t *testing.T) {
+	files, err := os.ReadDir("./testdata/good")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, st := range files {
+		t.Run(st.Name(), func(t *testing.T) {
+			ctx, cancel := context.WithCancel(t.Context())
+			cfg := loadConfig(t, filepath.Join("testdata", "good", st.Name()))
+
+			go func(ctx context.Context) {
+				if err := Main(ctx, Options{
+					ConfigFname: filepath.Join("testdata", "good", st.Name()),
+				}); err != nil {
+					var netOpErr *net.OpError
+					switch {
+					case errors.Is(err, context.Canceled):
+						// Context was canceled, this is expected
+						return
+					case errors.As(err, &netOpErr):
+						// Network operation error occurred
+						t.Logf("Network operation error: %v", netOpErr)
+						return
+					case errors.Is(err, http.ErrServerClosed):
+						// Server was closed, this is expected
+						return
+					default:
+						// Other unexpected error
+						panic(err)
+					}
+				}
+			}(ctx)
+
+			wait := 5 * time.Millisecond
+
+			for i := range make([]struct{}, 10) {
+				if i != 0 {
+					time.Sleep(wait)
+					wait = wait * 2
+				}
+
+				t.Logf("try %d (wait=%s)", i+1, wait)
+
+				resp, err := http.Get("http://localhost" + cfg.Bind.Metrics + "/readyz")
+				if err != nil {
+					continue
+				}
+
+				if resp.StatusCode != http.StatusOK {
+					continue
+				}
+
+				cancel()
+				return
+			}
+
+			t.Fatal("router initialization did not work")
+		})
+	}
+}
+
+func TestMainBadConfig(t *testing.T) {
+	files, err := os.ReadDir("./testdata/bad")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, st := range files {
+		t.Run(st.Name(), func(t *testing.T) {
+			if err := Main(t.Context(), Options{
+				ConfigFname: filepath.Join("testdata", "bad", st.Name()),
+			}); err == nil {
+				t.Error("wanted an error but got none")
+			} else {
+				t.Log(err)
+			}
+		})
+	}
+}