change test library to Spring test

Author: Vali (Vasile Baluta)

build.gradle

@@ -65,13 +65,17 @@ install.dependsOn shadowJar
 //    runtime.exclude group: 'org.slf4j', module: 'slf4j-api'
 //}
 
+ext {
+    sprintBootVersion = "1.4.1.RELEASE"
+}
+
 dependencies {
     compile 'org.springframework:spring-context:4.3.3.RELEASE'
     compile 'com.github.Ericsson:eiffel-remrem-shared:0.1.4'
     compile 'com.github.fge:json-schema-validator:2.2.6'
     compile 'org.slf4j:slf4j-api:1.7.18'
     compile group: 'com.google.code.gson', name: 'gson', version: '1.7.2'
     compile group: 'org.projectlombok', name: 'lombok', version: '1.16.8'
-    compile 'org.mockito:mockito-core:2.1.0'
     testCompile 'junit:junit:4.12'
+    testCompile("org.springframework.boot:spring-boot-starter-test:$sprintBootVersion")
 }