Spring boot: reference pom properties from application.properties in tests - spring

Question

This is my src/test/resources/application.yml:
app:
name: Configuration And Profiles
desc: This is an app to try out ${app.name}
version: #modelVersion#
I'm just trying to get the model version from my pom file:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
...
The test:
#WebMvcTest(ProfilingController.class)
public class RestControllerTest {
#Value("${app.version}")
private String version;
#Test
public void testHelloEnv() throws Exception {
System.out.println("VERSION: " + version);
}
}
The error I get:
org.yaml.snakeyaml.scanner.ScannerException: while scanning for the next token
found character '#' that cannot start any token. (Do not use # for indentation)
in 'reader', line 4, column 12:
version: #modelVersion#
^
The funny part is that I got the same property in the src/main/resource/application.yml, but in that case when I run the app normally, version: #modelVersion is correctly populated from pom and I can get the version without issues. It's like test's application.yml is not aware of pom.xml
any thoughts?
NOTE: using '#modelVersion' between single quotes prevents the error but I get the string #modelVersion instead of its value 4.0.0
Tech:
Spring boot version: 2.5.6
Junit version: Jupiter (5)
Maven version: 3.8.3

Answer 1

As described in the documentation resource filtering is enabled by the spring-boot-starter-parent
That is not the case for 'test' properties, so if you need this,
you need to enable filtering in the test-resources:
in your pom.xml
<build>
<testResources>
<testResource>
<directory>src/test/resources</directory>
<filtering>true</filtering>
</testResource>
</testResources>
...
</build>