DownloaderTest: Cover all three suppressed download exceptions

Signed-off-by: Frank Viernau <frank.viernau@here.com>

downloader/src/funTest/kotlin/DownloaderTest.kt

@@ -107,8 +107,12 @@ class DownloaderTest : StringSpec() {
             }
 
             exception.suppressed.size shouldBe 3
+            exception.suppressed.get(0)!!.message shouldBe "No VCS URL provided for 'Maven:junit:junit:4.12'. " +
+                    "Please define the \"connection\" tag within the \"scm\" tag in the POM file," +
+                    " see: http://maven.apache.org/pom.html#SCM"
             exception.suppressed.get(1)!!.message shouldBe "Source artifact does not match expected SHA-1 hash " +
                     "'0123456789abcdef0123456789abcdef01234567'."
+            exception.suppressed.get(2)!!.message shouldBe "Binary artifact URL for 'Maven:junit:junit:4.12' is empty."
         }
 
         "Falls back to downloading source package when download from VCS fails".config(tags = setOf(ExpensiveTag)) {