creating FieldEntry for unit tests

daniel.lipofsky · May 2022

I'm using EMA Java 3.6.5.0 and I would like to write some unit tests. I see elsewhere descriptions on how to use replayers or mock providers, which are really more like integration tests, but I am wanting to write some simple unit tests that run with junit at compile time and do not require spinning up a separate process, so I want to create a FieldEntry and pass it to my methods. I tried the following

FieldEntry field = EmaFactory.createFieldEntry().real(1234, 999, OmmReal.MagnitudeType.EXPONENT_NEG_2);
System.out.println(field.toString());
System.out.println("id="+field.fieldId());
System.out.println("load="+field.load());
System.out.println("code="+field.code());

FieldEntry field = EmaFactory.createFieldEntry().codeReal(5678);
System.out.println(field.toString());
System.out.println("id="+field.fieldId());
System.out.println("load="+field.load());
System.out.println("code="+field.code());

But load() is null and code() throws NullPointerException and toString() returns "Decoding of just encoded object in the same application is not supported".

How can I do this?

wasin.w · November 2022

Hello @daniel.lipofsky

Please be informed that GitHub-Issue #197 is available on the RTSDK version 2.0.7.L2. You can build the test jar with the following command:

gradlew packageTests

umer.nalla · May 2022

Hi @daniel.lipofsky

As stated in the error message, EMA does not support the decoding of a just encoded message.

However, if you refer to the existing EMA C++ post below - this may help you achieve something similar in EMA Java

decode of just encoded object in EMA C++ - Forum | Refinitiv Developer Community

daniel.lipofsky · May 2022

https://community.developers.refinitiv.com/discussion/comment/92987#Comment_92987

@umer.nalla that C++ example relies on the import of a StaticDecoder class. Is there an equivalent in Java? I don't see anything similarly named.

Jirapongse · May 2022

@daniel.lipofsky

I checked and found that the RTSDK Java package provides JUnitTestConnect.

You can see the examples in the Java\Ema\Core\src\test\java\com\refinitiv\ema\unittest directory, such as FieldListTests.java.

        // Decode FieldList with EMA.
        com.refinitiv.ema.access.FieldList fl = JUnitTestConnect.createFieldList();
        JUnitTestConnect.setRsslData(fl, buf, Codec.majorVersion(), Codec.minorVersion(), TestUtilities.getDataDictionary(), null);

daniel.lipofsky · May 2022

@Jirapongse JUnitTestConnect is part of com.refinitiv.ema.ema.3.6.5.0 but TestUtilities is not. Is this included in another JAR?

@umer.nalla I do not see any Java equivalent to that C++ StaticDecoder class you linked to.

Jirapongse · May 2022

https://community.developers.refinitiv.com/discussion/comment/93066#Comment_93066

@daniel.lipofsky

The source code of TestUtilities is in the package.

RTSDK Java doesn't provide StaticDecoder. It uses JUnitTestConnect for unit tests.

daniel.lipofsky · May 2022

https://community.developers.refinitiv.com/discussion/comment/93069#Comment_93069

@Jirapongse I see TestUtilities in the SDK code but not in the JAR. I assume if I built the test JAR myself I would see it, but is there a reason you don't push the test jar to maven central (search.maven.org)? That would make it much more convenient. I am trying to build it myself, but I am running into cert issues, and since I don't normally use gradle I do not know how to troubleshoot.

Jirapongse · May 2022

@daniel.lipofsky

The TestUtilities class contains the code for our unit tests. It implements the encoding and decoding logic for test data used by the unit tests.

Typically, users need to implement their own encoding and decoding logic to test their specific data. I think this is why it wasn't included in the jar file.

daniel.lipofsky · May 2022

https://community.developers.refinitiv.com/discussion/comment/93197#Comment_93197

Usually SDKs exist so that users don't have to implement their own encoding and decoding logic. That's a huge level of effort and a user shouldn't have to understand the underlying encoding/decoding details to implement a simple unit test.

Jirapongse · May 2022

https://community.developers.refinitiv.com/discussion/comment/93213#Comment_93213

@daniel.lipofsky

Yes, you are correct. However, EMA has a limitation that "Decoding of just encoded object in the same application is not supported".

Therefore, to create a field list for unit tests, we need ETA to encode the test data into a buffer. Then, use JUnitTestConnect to create a filed list and encode the buffer into the field list. Finally, use EMA to decode the field list.

daniel.lipofsky · May 2022

https://community.developers.refinitiv.com/discussion/comment/93217#Comment_93217

please then consider this a feature request: please add a utility to make it easy for your users to do this. It can be in a test jar, but it would be nice if that jar was published to maven central

wasin.w · May 2022

Hello @daniel.lipofsky

I found that you have submitted issues-197 on GitHub to the development team.

If you are using Maven, please be informed that you can build the code in Java/Ema/Core/src/test/ folder by adding the following dependencies in the pom.xml file

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.11</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <version>1.9.5</version>
</dependency>

Hope this helps.

daniel.lipofsky · May 2022

@wasin.w There is no pom.xml in the Real-Time-SDK project

wasin.w · May 2022

Hello @daniel.lipofsky

The RTSDK comes with Gradle build system/script by default. However, as the SDK libraries are available on the Maven central, so you can use the RTSDK with your Maven pom.xml as the following example:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0&quot; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance&quot;
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt;
    <modelVersion>4.0.0</modelVersion>


    <groupId>com.refinitiv.ema</groupId>
    <artifactId>RTSDKJ_Maven</artifactId>
    <version>1.0</version>
    <name>RTSDKJ_Maven</name>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <rtsdk.version>3.6.5.0</rtsdk.version>
    </properties>


    <dependencies>
          
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-core</artifactId>
            <version>1.9.5</version>
        </dependency>


        <dependency>
            <groupId>com.refinitiv.ema</groupId>
            <artifactId>ema</artifactId>
            <version>${rtsdk.version}</version>
        </dependency>
    </dependencies>   
</project>

You can find more detail in the How to Set Up Refinitiv Real-Time SDK Java Application with Maven article.

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