I am writing an annotation processor and want to write some unit tests for it using google-compile-testingand truth:
So, I want to write a very simple unit test.
import static com.google.common.truth.Truth.assertAbout;
import static com.google.testing.compile.JavaSourceSubjectFactory.javaSource;
@Test
public void componentOnConcreteClass() {
JavaFileObject componentFile = JavaFileObjects.forSourceLines("test.NotAClass",
"package test;",
"",
"import my.annotation.MyAnnotation;",
"",
"@MyAnnotation",
"interface NotAComponent {}");
assertAbout(javaSource()).that(componentFile)
.processedWith(new MyProcessor())
.failsToCompile()
.withErrorContaining("interface");
}
So basically I have a copy, inserted a simple test from google dagger2 repo and replaced the corresponding data with my annotation processor. I use maven and I use the same dependencies as dagger2:
<dependency>
<groupId>com.google.testing.compile</groupId>
<artifactId>compile-testing</artifactId>
<version>0.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.truth</groupId>
<artifactId>truth</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>test</scope>
</dependency>
But I can not compile the code. I think there is a problem with generic param parameters, but I can not understand what the problem is.
Compilation failure:
[ERROR] ProcessorTest.java:[46,5] method assertAbout in class com.google.common.truth.Truth cannot be applied to given types;
[ERROR] required: com.google.common.truth.SubjectFactory<S,T>
[ERROR] found: com.google.testing.compile.JavaSourceSubjectFactory
[ERROR] reason: no instance(s) of type variable(s) S,T exist so that argument type com.google.testing.compile.JavaSourceSubjectFactory conforms to formal parameter type com.google.common.truth.SubjectFactory<S,T>
Any hint what am I doing wrong? I can not find the difference in google dagger2 tests (which, by the way, compile on my machine)