Fault injection system and method of fault injection

A method of fault injection into a software system, wherein the software system includes executable commands, events generated by commands and states representing a state of a state machine between two events, comprising

• providing a rule for injecting a selected fault, wherein the rule provides a fault injection decision in the occurrence of a selected command, a selected state during which fault injection is to occur and a condition under which fault injection is to occur;
• determining when the selected state will occur to provide a duration of a state as a time interval for fault injection, wherein the determination is based on a predictive time model, wherein the predictive time model comprises an occurrence and a duration of the state and wherein the state occurs after an elapsed time of a first event and the duration of a state starts after the first event and ends before a second event, wherein both events originate from the same command and wherein the elapsed time is defined by a time interval starting with the execution of the command and ending with the termination of the event;
• and
• executing the selected command and injecting the selected fault during the time interval.

A computer system, comprising a processor, and a memory, the memory stores executable commands, that when processed by the processor, cause the processor to:

• provide a rule for injecting a selected fault, wherein the rule provides a fault injection decision in the occurrence of a selected command, a selected state during which fault injection is to occur and a condition under which fault injection is to occur;
• determine when the selected state will occur to provide a duration of a state as a time interval for fault injection, wherein the determination is based on a predictive time model, wherein the predictive time model comprises an occurrence and a duration of the state and wherein the state occurs after an elapsed time of a first event and the duration of a state starts after the first event and ends before a second event, wherein both events originate from the same command and wherein the elapsed time is defined by a time interval starting with the execution of the command and ending with the termination of the event;
• and
• execute the selected command and inject the selected fault during the time interval.