Minor fix to error message (#841)

Was not properly adding space, as such: ``` java.lang.IllegalStateException: Was not able to discover any classes for archives=testsuite/test/example/example.jarprefixes=Set(), suffixes=Set(Test) ```
bazelbuild · Sep 3, 2019 · 3edf15d · 3edf15d
1 parent 5261499
commit 3edf15d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/java/io/bazel/rulesscala/test_discovery/DiscoveredTestSuite.scala b/src/java/io/bazel/rulesscala/test_discovery/DiscoveredTestSuite.scala
@@ -49,7 +49,7 @@ object PrefixSuffixTestDiscoveringSuite {
     val classes = archives.flatMap(discoverClassesIn)
     if (classes.isEmpty)
       throw new IllegalStateException("Was not able to discover any classes " +
-                                      s"for archives=${archives.mkString(",")}" +
+                                      s"for archives=${archives.mkString(",")}, " +
                                       s"prefixes=$prefixes, " +
                                       s"suffixes=$suffixes")
     classes