feat: complete IM P0 and P1 reliability work

server/store/tenant_store_test.go

@@ -1,6 +1,7 @@
 package store
 
 import (
+	"encoding/json"
 	"testing"
 
 	"github.com/tinode/chat/server/store/types"
@@ -11,3 +12,30 @@ func TestForTenantRejectsZero(t *testing.T) {
 		t.Fatalf("ForTenant(0) = (%v, %v), want (nil, malformed)", scoped, err)
 	}
 }
+
+func TestValidateMessageHeadersProductContract(t *testing.T) {
+	valid := []types.KVMap{
+		{"x-im-schema": float64(1), "x-im-type": "text"},
+		{"x-im-schema": json.Number("1"), "x-im-type": "voice"},
+		{"x-im-schema": "1", "x-im-type": "contact_card"},
+		{"x-im-schema": 1, "type": "audio", "x-im-type": "voice"},
+		{"type": "system"},
+	}
+	for _, head := range valid {
+		if err := validateMessageHeaders(head); err != nil {
+			t.Fatalf("validateMessageHeaders(%v) = %v, want nil", head, err)
+		}
+	}
+
+	invalid := []types.KVMap{
+		{"x-im-schema": float64(2), "x-im-type": "text"},
+		{"x-im-schema": true, "x-im-type": "text"},
+		{"x-im-schema": float64(1), "x-im-type": "unknown"},
+		{"type": "text", "x-im-type": "image"},
+	}
+	for _, head := range invalid {
+		if err := validateMessageHeaders(head); err != types.ErrMalformed {
+			t.Fatalf("validateMessageHeaders(%v) = %v, want malformed", head, err)
+		}
+	}
+}