Moved gui tests from spotbugs project to spotbugs-tests project

Second part needed to fully fix #1914
THis project does not have tests anymore, so jacoco is not needed.

spotbugs-tests/build.gradle

@@ -20,19 +20,27 @@ dependencies {
   implementation 'org.apache.ant:ant:1.10.12'
   implementation "org.apache.logging.log4j:log4j-slf4j18-impl:$log4jVersion"
   implementation 'com.google.errorprone:error_prone_annotations:2.10.0'
+  implementation files(project(":spotbugs").sourceSets.gui.output)
 }
 
 java {
   withSourcesJar()
 }
 
+
+tasks.named('compileJava', JavaCompile).configure {
+  options.release = 11
+}
+
 artifacts {
   archives sourcesJar
 }
 
 tasks.named('jacocoTestReport', JacocoReport).configure {
+  dependsOn('unstableTest')
   additionalSourceDirs.setFrom files(project(':spotbugs').sourceSets.main.java.srcDirs)
   additionalClassDirs.setFrom files(project(':spotbugs').sourceSets.main.output.classesDirs)
+  executionData.setFrom files("$buildDir/jacoco/unstableTest.exec", "$buildDir/jacoco/test.exec")
 }
 
 // Tests below fail if executed with other tests
@@ -55,6 +63,7 @@ test {
   }
 }
 
+
 spotbugs {
   ignoreFailures = true
 }

spotbugs/build.gradle

@@ -1,4 +1,3 @@
-apply from: "$rootDir/gradle/jacoco.gradle"
 apply from: "$rootDir/gradle/maven.gradle"
 apply from: "$rootDir/gradle/checkstyle.gradle"
 apply from: "$rootDir/gradle/javadoc.gradle"
@@ -50,11 +49,6 @@ sourceSets {
       include '**/*.png'
     }
   }
-  guiTest {
-    java {
-      srcDirs = ['src/gui/test/java']
-    }
-  }
 }
 
 dependencies {
@@ -94,9 +88,6 @@ dependencies {
   guiImplementation sourceSets.main.runtimeClasspath
   guiCompileOnly 'com.apple:AppleJavaExtensions:1.4'
   guiCompileOnly project(':spotbugs-annotations')
-  guiTestImplementation sourceSets.gui.runtimeClasspath
-  guiTestImplementation 'junit:junit:4.13.1'
-  guiTestCompileOnly project(':spotbugs-annotations')
 
   // for Eclipse compilation only
   appleExtensions 'com.apple:AppleJavaExtensions:1.4'
@@ -331,18 +322,6 @@ publishing.publications.maven {
 ext.moduleName = 'com.github.spotbugs.spotbugs'
 apply from: "$rootDir/gradle/jigsaw.gradle"
 
-def guiTest = tasks.register('guiTest', Test) {
-  classpath = project.sourceSets.guiTest.runtimeClasspath
-  testClassesDirs = project.sourceSets.guiTest.output.classesDirs
-}
-
-tasks.named('jacocoTestReport', JacocoReport).configure {
-  dependsOn(guiTest)
-  executionData.setFrom files("$buildDir/jacoco/guiTest.exec")
-  sourceDirectories.setFrom files(sourceSets.main.java.srcDirs, sourceSets.gui.java.srcDirs)
-  classDirectories.setFrom files(sourceSets.main.output, sourceSets.gui.output)
-}
-
 tasks.named('spotbugsTest').configure {
   ignoreFailures = true
 }

spotbugs/build.properties

@@ -1,6 +1,5 @@
 source.spotbugs.jar = src/main/java/,\
                       src/gui/main/,\
-                      src/gui/test/java/,\
                       src/xsl/,\
                       etc
 bin.includes = .libs/,\