provide a generic assert function

client/pkg/verify/verify.go

@@ -15,6 +15,7 @@
 package verify
 
 import (
+	"fmt"
 	"os"
 	"strings"
 )
@@ -70,3 +71,10 @@ func Verify(f func()) {
 		f()
 	}
 }
+
+// Assert will panic with a given formatted message if the given condition is false.
+func Assert(condition bool, msg string, v ...interface{}) {
+	if !condition {
+		panic(fmt.Sprintf("assertion failed: "+msg, v...))
+	}
+}