JP2001175502A - Telegraphic message simulator and recording medium therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telegraphic message simulator and a recording medium therefor, in which a control sequence can be easily corrected and changed. SOLUTION: An interpreter language part 12 performs the preparation of telegraphic message information to be exchanged with a system 50 to be controlled or control of communication with the system 50 to be tested by successively interpreting and executing source codes described in a high-level language. Besides, on the basis of an instruction from the interpreter language part 12, a conversion controller 13 performs a connection instruction to any one of transmitters/receivers 10-1, 10-2,..., 10-n or write/read control of a telegraphic message to a telegraphic message information storage device 11 and when writing and reading the telegraphic message in the telegraphic message information storage device 11, data contained in the telegraphic message are converted into the form instructed by the interpreter language part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a message simulator for simulating message information to be transmitted to a system under test and transmitting and receiving the message information to and from the system under test in accordance with the message information received from the system under test. It relates to the recording medium.

[0002]

2. Description of the Related Art A telegram simulator communicates with, for example, an external device and performs various processing in response to a request from the external device. Various requests to be transmitted to the system later are simulated, and the information is exchanged with the system. This telegram simulator is used during the development of the above-described system to verify whether the system operates as specified.

In the following, information exchanged between the electronic simulator and the system under test, such as various data and requests transmitted by the electronic simulator and the response of the system under test, is collectively referred to as electronic message information.

Here, a general schematic configuration of a telegram simulator is shown in a block diagram of FIG. In this figure, 5
0 is the system under test, 60 is the system under test 50
This is a message simulator that simulates and sends message information exchanged with the device. This telegram simulator 6
0, an input device 61 for operating the message simulator 60, a transmitting / receiving device 62 for communicating with the system under test 50, a display device 63 for displaying the content of message information, etc.
Control of the transmitting / receiving device 62, display control on the display device 63, analysis of message information transmitted from the system under test 50,
And a control sequence unit 64 for creating and transmitting message information based on the analysis result.

In the message simulator 60 having the above-described configuration, for example, when the transmission / reception device 61 receives message information from the system under test 50, the control sequence unit 64 analyzes the content of the received message information and is set in advance. Based on the communication procedure, message information corresponding to the received message information is generated and transmitted to the system under test 50. Further, the control sequence unit 64 displays the transmitted / received message information on the display device 6.
3 and record it. Then, by checking the message information recorded by the message simulator 60, the operation of the system under test 50 can be verified.

[0006] Further, in this type of message simulator, for example, a transmission / reception message individually created or set by an operator, as disclosed in Japanese Patent Application Laid-Open No. 9-212439,
Communication operations, and individual states that occur during the communication operation process,
In some cases, an execution program is created by combining the individual programs that perform processing operations corresponding to events into one, and the execution program is executed to exchange message information with the system under test.

[0007]

When the control sequence unit 64 of the telegram simulator shown in FIG. 3 is realized by a program, first, the function to be executed by the control sequence unit 64 is described in source code, and the source code is described. The execution program that performs the function of the control sequence unit 64 is generated by compiling.

When a control sequence or the like is changed in a program created as described above, for example, the source code of the program has complicated contents in which various controls such as communication control, display control, and input control are involved. And after compiling the source code,
It was necessary to repeatedly perform operations such as debugging → recompilation. For this reason, the control sequence cannot be easily changed, and changes and corrections of the program are complicated, and a long time is required for these operations.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a message simulator capable of easily modifying and changing a control sequence and a recording medium therefor. It is another object of the present invention to provide a message simulator capable of flexibly coping with the format of data included in message information while achieving the object, and a recording medium therefor.

[0010]

According to a first aspect of the present invention, there is provided a message simulator which simulates message information to be transmitted to a system under test and transmits / receives the message information to / from the system under test. The contents of the message information described and transmitted to the system under test and the contents of the source code defining the communication procedure with the system under test are sequentially interpreted, and the contents of the source code are transmitted in accordance with the message information transmitted from the system under test. Interpreter means for creating message information to be returned to the test system and controlling transmission and reception of message information to and from the system under test, and transmission and reception of message information to and from the system under test based on instructions from the interpreter means. Transmission / reception means for performing the transmission and reception.

According to a second aspect of the present invention, in the electronic message simulator according to the first aspect, a conversion control means for converting a data format of electronic information transmitted / received with the system under test in accordance with an instruction of the interpreter means. It is characterized by having.

According to a third aspect of the present invention, in the electronic simulator of the second aspect, the electronic simulator further comprises electronic message information storage means for temporarily storing electronic message information exchanged with the system under test. The conversion control unit writes or reads the message information received from the system under test by the transmission / reception unit and the message information created by the interpreter unit to the message information storage unit according to an instruction from the interpreter unit. It is characterized by:

According to a fourth aspect of the present invention, in the electronic message simulator according to the third aspect, the conversion control unit writes or reads electronic message information to or from the electronic message information storage unit in accordance with an instruction from the interpreter unit. Checking whether there is an error in the instruction of the interpreter means, and if there is an error, does not write or read the message information storage means, and notifies the interpreter means that there is an error in the instruction. In addition, an error is displayed on the display device.

[0014] The invention according to claim 5 provides the invention according to claims 1 to 4.
The telegram simulator according to any one of the above, further comprising a plurality of transmission / reception means respectively corresponding to different communication protocols, wherein said conversion control means comprises a plurality of systems under test and a communication protocol used by each of said systems under test. Are recorded in association with each other, and the transmission means used for communication with the system under test designated by the interpreter means is switched with reference to the table.

[0015] The invention according to claim 6 is the invention according to claims 1 to 5.
5. The message simulator according to claim 1, wherein the interpreter has a plurality of source codes, each of which corresponds to a different system under test. Interprets the contents of the source code specified from
It is characterized in that it creates message information to be returned to the system under test according to the message information transmitted from the system under test, and controls transmission and reception of message information to and from the system under test.

According to a seventh aspect of the present invention, there is provided a computer-readable recording medium which simulates message information to be transmitted to a system under test and records a program for transmitting and receiving the message information to and from the system under test. And sequentially interprets the contents of the message information described in the high-level language and transmitted to the system under test and the contents of the source code defining the communication procedure with the system under test, and transmits the message information transmitted from the system under test. Creating message information to be sent back to the system under test, and controlling transmission / reception of message information to / from the system under test; and transmitting the message information to the system under test based on an instruction from the interpreter means. And a program for causing a computer to execute the step of transmitting and receiving information.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a telegram simulator according to the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration of a telegram simulator 1 according to the present embodiment. In this figure, 10-1,
, 10-n are transmission / reception devices that exchange message information with the system under test 10 according to different communication protocols (for example, TCP / IP, etc.). Reference numeral 11 denotes a message information storage device which temporarily stores message information exchanged with the system under test 50.

Reference numeral 12 denotes an interpreter language unit, for example,
It sequentially interprets and executes source code written in an interpreted language such as perl. The source code describes a communication procedure performed between the message simulator 1 and the system under test 50, contents of message information exchanged with the system under test 50 during execution of the communication procedure, and the like. The interpreter language unit 12 has source codes corresponding to a plurality of types of systems under test in advance, and executes a process described in a source code selected by an operator.

Reference numeral 13 denotes a conversion control device which, based on an instruction from the interpreter language unit 12, instructs connection to the transmission / reception device and writes / writes message information to the message information storage device 11.
It performs read control and the like. The conversion control device 13 has a table in which the system under test that can be tested by the telegram simulator shown in FIG. 1 is associated with the address of the system under test and the communication protocol used.

When the interpreter language unit 12 instructs connection with the system under test selected by the operator, the conversion control unit 13 determines the communication protocol and address used by the system under test based on the table. I do. Then, the transmitting and receiving apparatuses 10-1, 10
A transmission / reception device corresponding to the communication protocol determined above is selected from −2,..., 10-n, connected to the system under test, and thereafter communicates with the system under test via the selected transmission / reception device. .

The conversion control device 13 converts data included in the message information into a format instructed by the interpreter language section 12 when writing and reading the message information in the message information storage device 11 (details will be described in detail). Will be described later). Further, when there is an error in the content specified by the interpreter language unit 12, the conversion control device 13 notifies the interpreter language unit 12 of the error and notifies the operator of the content of the error.

Reference numeral 14 denotes a display device, which is stored in the interpreter language unit 12, the state of the simulation, debug information (described later) to be inserted into the message information, the contents of errors included in instructions from the interpreter language unit 12. Displays the contents of the source code. Reference numeral 15 denotes an input device for performing operations on the message simulator 1, editing source code stored in the interpreter language unit 12, and inputting debug information to be inserted into message information.
Used by operators. 16 is a storage device, a system under test selected by the operator,
Specific message information exchanged in a predetermined pattern is stored in advance.

Next, the operation of the above-described electronic message simulator 1 will be described with reference to the sequence diagram of FIG. First, when the power of the telegram simulator is turned on, the conversion control device 13 causes the display device 14 to list the names of the systems under test that can be tested by the telegram simulator 1 (a-1). Then, when the operator selects a desired system to be tested from the list of displayed systems using the input device 15 (a-2), the conversion control device 13 instructs the interpreter language unit 12 to select the selected system to be tested. To start the execution of the source code for simulation (simulation program) (a-3).

As a result, the interpreter language section 12
The user selects a designated source code from among a plurality of source codes provided in advance, starts sequential interpretation and execution of the processing content described in the selected source code, and also instructs the conversion control device 13 to execute the process. Notify that the execution of the program has started (a-4). Then, the conversion control device 13 that has received this notification transmits, for example, “XX
A message such as "System simulation has started" is displayed on the display device 14 (a-5).

Then, the interpreter language section 12 starts processing for connecting to the system (system under test) selected by the operator according to the description of the source code. First, the interpreter language unit 12 outputs a connection command to the system under test to the conversion control device 13 (b-
1). Here, for example, if the operator has selected a system named “system 1”, the interpreter language unit 12 sends “/ connect system
The connection instruction "1" is output.

Thus, the conversion control device 13 determines the connection destination system (system 1) from the received connection command, refers to a built-in table, and uses the address of the system and the address used by the system. Recognize the communication protocol used. Next, the conversion control device 13
.., 10-n, a transmission / reception device that can support the recognized communication protocol is determined (herein, the transmission / reception device 10-1). A connection request is transmitted to the system under test 50 (b-
2). In response to this connection request, the system under test 5
When a connection response (a kind of message information) is sent from 0 (b-3), the transmission / reception device 10-1 outputs the message information to the conversion control device 13 (b-4).

The conversion control device 13 includes a transmission / reception device 10-1.
When receiving the electronic message information from the electronic device, a storage area for the size of the received electronic message information is secured in the electronic message information storage device 11. At this time, the conversion control device 13 assigns a unique number (hereinafter, referred to as a memory number) to the secured storage area,
The memory number is stored in association with the start address and size of the secured storage area. Then, the received message information is written in the secured storage area (b-5), and the memory number corresponding to the storage area in which the message information is written is output to the interpreter language unit 12 (b-6). Further, the conversion control device 13 causes the display device 14 to display a message indicating that the connection with “system 1” has been completed (b-7).

On the other hand, when the interpreter language unit 12 receives the memory number, it determines that the message information has been received from the system under test 50, and starts a process (analysis sequence) for recognizing the content of the received message information. I do. First,
The interpreter language unit 12 outputs a read command for reading the message information stored in the memory number received from the conversion control device 13 to the conversion control device 13 (b-
8). Here, the format of the read command in this embodiment is
For example, “/ read A # S # L # T”. In this format,
The description below “/ read” is the argument of the read instruction, A is the memory number, S is the read start position, L is the read byte length, T is the data format, and these values are described in the source code in advance. Is determined according to what is being done.

Note that the memory number, read start position, and read byte length are specified by numerical values, and the data format is ch.
It is specified by one of the character strings of ar, hex, and bit. The unit of the numerical value specified as the read start position and the read byte length is bytes, and the character strings of char, hex, and bit specified as the data format are character data, binary data (hexadecimal), and This means that data is read out as bit data (for example, data in which “0” and “1” have a meaning like a flag).

For example, “/ r
When the instruction “ead 1 # 0 # 2 # char” is output, the conversion control device 13 outputs two bytes of data from the 0th byte (here, the most significant digit) of the data stored in the memory number 1. Here, it is understood that the relationship between the output data of the conversion control unit 13 and the data recognized by the interpreter language unit 12 when each data format is specified is shown in [Table 1]. It will be described with reference to FIG.

In the following description, the message information storage unit 1
1, the 3-byte data 01 is stored in the memory number “1”.
4142 (H) is stored, and an instruction (/ read 1 # 1 # 2 #-) for reading data of 2 bytes from the first byte of the data is output from the interpreter language unit 12. . As a result, the data read from the message information storage device 11 by the conversion control device 13 becomes 4142 (H).

[0032]

[Table 1]

As shown in this table, when, for example, character data (char) is specified as the data format, the conversion control device 13 outputs the read data (4142 (H)) to the interpreter language unit 12 as it is. This allows
The interpreter language unit 12 converts the received data into "a
b "(ASCII code 41 (H) is" a ", 42 (H)
Is recognized as "b").

When binary data (hex) is designated, the conversion control device 13
The data (H) is converted to the data 343134432 (H) and output. As a result, the interpreter language unit 12 converts the received data into “4142” (that is, 34 (H) in ASCII code is “4”, 31 (H)
Is recognized as "1" and 32 (H) as "2").

Further, when bit data (bit) is designated, the conversion control device 13 converts the data 4142 (H) into the data 303130303030303130313.
The data is converted into data of 03030303130 (H) and output. As a result, the interpreter language unit 12 converts the received data into “0000000010100001”.
Recognize as "0".

The conversion control device 13 having received the above read command checks the argument of the read command, and indicates that an incorrect memory number has been specified or that the message length exceeds the message length of the message information received as the read start position. When the position is indicated, for example, before executing the read instruction, it is determined that the read instruction contains an error.
Is displayed on the display device 14. And
When the interpreter language unit 12 receives this notification, the subsequent processing of the source code is interrupted. By providing such an error detection function in the conversion control device 13, it is possible to prevent the electronic message simulator 1 itself from going down. This error detection function is performed by the conversion control device 13 every time a read command or a write command described later is received.

If no error is included in the read command, the conversion control device 13 accesses the message information storage device 11 (b-9) and reads data according to the argument of the read command (b-10). The data is converted into the data format specified by the argument and output to the interpreter language unit 12 (b-1
1). The interpreter language unit 12 receiving the data from the conversion control device 13 analyzes the data and determines the contents of the message information received from the system under test 50. The interpreter language unit 12 may output a read command to the conversion control device 13 a plurality of times in order to determine the content of the received message information.

The interpreter language unit 12 determines the contents of the received message information, and when recognizing that the connection with the device under test has been established, the interpreter language unit 12 transmits the message to the system under test 50 in accordance with the communication procedure described in the source code. Create message information to be output (information setting sequence). First, the interpreter language section 12 notifies the conversion control device 13 of the size of the message information to be created in order to secure an area for creating the message information in the message information storage device 11 (c- 1). Thereby, the conversion control device 13 secures a storage area of the notified size in the message information storage device 11, stores the start address and the size of the secured storage area together with the memory number assigned to the storage area, and Is output to the interpreter language section 12 (c-2).

When the interpreter language section 12 receives the memory number, it creates message information in accordance with the contents specified in the source code and outputs the message information to the conversion control device 13 together with a write command (c-3). Here, the format of the above-described write command is, for example, after a command “/ write”,
It is assumed that the same argument as the read command and the content of the message information to be written to the message information storage device 11 are added. When the conversion control device 13 receives the write command, it converts the message information included in the write command into the data format specified by the argument, and in the message information storage device 11, the message information is also specified by the argument. Write to the specified position of the memory number (c-4).

At this time, when specific message information is exchanged with the system under test 50 in a predetermined pattern, the message information stored in the storage device 16 in advance is determined by the conversion control device 13. May be read and written to the secured storage area. In addition, when the system under test 50 receives message information including an error from outside, intentionally erroneous information (debug information) input from the input device 15 by an operator to verify what operation is performed. May be inserted into the message information.

Here, when writing the message information based on the write command, the data output from the interpreter language unit 12 when each data format is designated and the data converted by the conversion control unit 13 Is shown in [Table 2].

[0042]

[Table 2]

As shown in this table, when the interpreter language section 12 outputs, for example, data of 3130 (H) as character data “10” (argument “char”), the conversion control device 13 converts the received data into Write to the specified storage area as it is. The interpreter language unit 12
Calculates the data of 3130 (H) as hexadecimal 10
When the data is output as (H) (argument “hex”), the conversion control device 13 converts the received data into 10 and writes it to the specified storage area. Furthermore, interpreter language unit 1
2 outputs 3130 (H) as bit information “1” and “0” (argument “bit”),
The conversion control device 13 converts the received data into 2 (H) and writes it to the designated storage area.

When the message information to be transmitted to the system under test 50 is written in the secured storage area in the message information storage device 11 in this manner, the interpreter language unit 12
Instructs the conversion control device 13 to transmit the message information to the system under test 50 (c-5). The conversion control device 13 refers to the table to notify the address of the system under test 50 to the transmission / reception device 10-1, and indicates the memory number in which the message information instructed to be transmitted is stored (c- 6). Thereby, the transmission / reception device 10
-1 reads out the message information stored in the notified memory number from the message information storage device 11 and sends it to the system under test 50 (c-7).

When the message information is normally transmitted to the system under test 50, the conversion control device 13 releases the previously received message information and the storage area reserved for the transmitted message information. . On the other hand, when the message information is not transmitted normally, the conversion control device 13 notifies the interpreter language unit 12 that a transmission error has occurred, and releases the storage area according to the instruction from the interpreter language unit 12. Do.

Thereafter, the message simulator 1 repeats the same procedure as that described above in accordance with the description of the source code in the interpreter language section 12 to continuously exchange message information with the system under test 50.

A program for realizing the functions of the telegram simulator 1 shown in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on this recording medium is read by a computer system and executed. Thus, a message simulator may be realized.

Here, the “computer system” includes an OS and hardware such as peripheral devices.
If a WW system is used, a homepage providing environment (or display environment) is also included. The “computer-readable recording medium” is a floppy disk, a magneto-optical disk, a ROM, a CD-R
It refers to a portable medium such as an OM or a storage device such as a hard disk built in a computer. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) inside a computer system which is a server or a client when transmitting a program via a network such as the Internet or a communication line such as a telephone line. , For a certain period of time.

The above program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. here,
A “transmission medium” for transmitting a program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a telephone line (communication line).
Further, the above-mentioned program may be for realizing a part of the above-mentioned functions, and further can realize the above-mentioned functions in combination with a program already recorded in the computer system, that is, a so-called differential It may be a file (difference program).

.., 10-n, for example, having a communication function between processes in a program under development. Can be used as a program for checking the program under development.

[0051]

As described above, according to the present invention,
The provision of the interpreter means allows the contents to be transmitted to the system under test described in a high-level language, the communication procedure with the system under test, and the source code that defines the control sequence of each part of the message simulator. Since pseudo message information can be exchanged with the test system, the control sequence can be easily modified and changed.

Also, according to the instruction of the interpreter means,
By providing the conversion control means for converting the data format of the message information exchanged with the system under test, it is possible to flexibly cope with the data format included in the message information. In general, source code created by an interpreted language has the advantage that its contents are easy for humans to understand, but treats the data as a character string, so various formats such as character data, binary data, and bit data are used. It was not suitable for a program for a telegram simulator that handles data. Therefore, by providing the above-described conversion control means, a program created in an interpreted language can correspond to data in various formats.

Further, a telegram information storage means for temporarily storing telegram information exchanged with the system under test is provided separately, and the conversion control means operates according to an instruction from the interpreter means to transmit the telegram information received from the system under test. Information, and
The processing time can be shortened by writing or reading the message information created by the interpreter means in the message information storage means.

Normally, message information is processed by a plurality of processes in the interpreter. For this reason, if the processing related to the message information is performed only by the interpreter means without the above-described message information storage means, when the process of the message information performed by one process is taken over by another process, the certain process is not processed. The written message information is once written into a memory in the interpreter means, and the other process reads the message information and takes over the processing. Since this operation is performed every time a process is handed over between processes, the processing time is lengthened, and the length of a message that can be handled is also limited. Therefore, by providing the independent message information storage means, each process in the interpreter means can refer to the message information stored in the message information storage means. Operation is unnecessary, and the restriction on the message length is relaxed.

Further, when the conversion control means writes or reads message information to or from the message information storage means in accordance with the instruction of the interpreter means, if there is an error in the instruction of the interpreter means, the conversion control means writes or reads the message information storage means. Instead, it notifies the interpreter that there was an error in the instruction, so that the interpreter that received the notification interrupts the subsequent processing of the source code and the message simulator itself goes down. Can be avoided.

Further, a plurality of transmission / reception means respectively corresponding to different communication protocols are provided.
A transmission table used for communication with the system under test designated by the interpreter means with reference to the table, in which a plurality of systems under test and a communication protocol used by each of the systems under test are recorded in association with each other; Since the means is switched, it is possible to flexibly cope with communication protocols used by various systems under test.

Further, a plurality of types of source codes, each corresponding to a different system under test, are prepared in advance, and the interpreter means communicates with the system under test in accordance with the contents of the source code specified externally at the start of operation of the telegram simulator. By transmitting and receiving pseudo message information, it can be used as a message simulator for various systems.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a telegram simulator according to the present invention.

FIG. 2 is a sequence diagram showing an operation of the telegram simulator.

FIG. 3 is a block diagram showing a schematic configuration of a general telegram simulator.

[Explanation of symbols]

1, 60 Message simulator 10-1, 10-2, ..., 10-n, 62 Transmission / reception device 11 Message information storage device 12 Interpreter language unit 13 Conversion control device 14, 63 Display device 15, 61 Input device 16 Storage device 50 System under test 64 Control sequence unit

Claims (7)

[Claims] 1. A message simulator which simulates message information to be transmitted to a system under test and transmits / receives message information to / from the system under test, the content of the message information described in a high-level language and transmitted to the system under test. And sequentially interprets the contents of the source code that defines the communication procedure with the system under test, creates message information to be returned to the system under test in response to the message information transmitted from the system under test, An electronic device comprising: an interpreter for controlling transmission and reception of electronic message information to and from the system under test; and a transmitting and receiving unit for transmitting and receiving electronic message information to and from the system under test based on an instruction from the interpreter. Simulator. 2. According to an instruction of said interpreter means,
2. The message simulator according to claim 1, further comprising a conversion control unit that converts a data format of message information exchanged with the system under test. 3. An electronic apparatus according to claim 1, further comprising: a message information storage unit for temporarily storing message information exchanged with the system under test, wherein the conversion control unit transmits and receives the message information according to an instruction from the interpreter unit. 3. The electronic device according to claim 2, wherein the electronic message information received from the system under test and the electronic message information created by the interpreter are written or read into the electronic message information storage.
Telegram simulator described in. 4. The method according to claim 1, wherein the conversion control unit checks whether there is an error in the instruction of the interpreter unit when writing or reading the message information to or from the message information storage unit according to the instruction of the interpreter unit. If there is an error, writing or reading to or from the message information storage means is not performed, the interpreter is notified of the error in the instruction, and an error is displayed on a display device. 3. The telegram simulator according to 3. 5. A table having a plurality of transmission / reception means respectively corresponding to different communication protocols, wherein said conversion control means records a plurality of systems under test and communication protocols used by each of said systems under test in association with each other. The message according to any one of claims 1 to 4, wherein a transmission unit used for communication with the system under test specified by the interpreter unit is switched with reference to the table. Simulator. 6. The interpreter means has a plurality of source codes, each corresponding to a different system under test, and, among the plurality of source codes, the contents of a source code specified externally when the operation of the message simulator is started. And sequentially creating message information to be returned to the system under test in accordance with the message information transmitted from the system under test, and controlling transmission and reception of message information to and from the system under test. The telegram simulator according to any one of claims 1 to 5, wherein: 7. A computer-readable recording medium that simulates electronic message information to be transmitted to a system under test and records a program for transmitting and receiving electronic message information to and from the system under test, and is described in a high-level language. , Sequentially interprets the contents of the message information to be transmitted to the system under test and the contents of the source code defining the communication procedure with the system under test, and responds to the message information transmitted from the system under test. Creating message information to reply to, and controlling transmission and reception of message information to and from the system under test, and sending and receiving message information to and from the system under test based on an instruction from the interpreter means. A computer-readable recording medium that records a program to be executed by a computer.