Add support for j in test_configurations.go (#1136)

* Add support for j in test_configurations.go

* Exchange double quotes to backtick

* Update test_configurations.go

Author: eNascimento178

workspace/test_configurations.go

@@ -139,6 +139,9 @@ var TestConfigurations = map[string]TestConfiguration{
 	"haskell": {
 		Command: "stack test",
 	},
+	"j": {
+		Command: `jconsole -js "exit echo unittest {{test_files}} [ load {{solution_files}}"`,
+	},
 	"java": {
 		Command: "gradle test",
 	},