Ensure user config is complete in submit tests

The submit command tests would fail spuriously if we
validate that the api url is set (i.e. that the CLI is configured).

cmd/submit_test.go

@@ -54,6 +54,7 @@ func TestSubmitNonExistentFile(t *testing.T) {
 	v := viper.New()
 	v.Set("token", "abc123")
 	v.Set("workspace", tmpDir)
+	v.Set("apibaseurl", "http://api.example.com")
 
 	cfg := config.Config{
 		Persister:       config.InMemoryPersister{},
@@ -92,6 +93,7 @@ func TestSubmitExerciseWithoutMetadataFile(t *testing.T) {
 	v := viper.New()
 	v.Set("token", "abc123")
 	v.Set("workspace", tmpDir)
+	v.Set("apibaseurl", "http://api.example.com")
 
 	cfg := config.Config{
 		Persister:       config.InMemoryPersister{},
@@ -113,6 +115,7 @@ func TestSubmitFilesAndDir(t *testing.T) {
 	v := viper.New()
 	v.Set("token", "abc123")
 	v.Set("workspace", tmpDir)
+	v.Set("apibaseurl", "http://api.example.com")
 
 	cfg := config.Config{
 		Persister:       config.InMemoryPersister{},
@@ -426,6 +429,7 @@ func TestSubmitOnlyEmptyFile(t *testing.T) {
 	v := viper.New()
 	v.Set("token", "abc123")
 	v.Set("workspace", tmpDir)
+	v.Set("apibaseurl", "http://api.example.com")
 
 	cfg := config.Config{
 		Persister:       config.InMemoryPersister{},
@@ -465,6 +469,7 @@ func TestSubmitFilesFromDifferentSolutions(t *testing.T) {
 	v := viper.New()
 	v.Set("token", "abc123")
 	v.Set("workspace", tmpDir)
+	v.Set("apibaseurl", "http://api.example.com")
 
 	cfg := config.Config{
 		Persister:       config.InMemoryPersister{},