Merge pull request ipfs/interface-go-ipfs-core#57 from MichaelMure/fa…

…tal-on-err

test: fail early on err to avoid an unrelated panic

This commit was moved from ipfs/interface-go-ipfs-core@d2f36ed

coreiface/tests/block.go

@@ -156,15 +156,15 @@ func (tp *TestSuite) TestBlockRm(t *testing.T) {
 
 	_, err = api.Block().Get(ctx, res.Path())
 	if err == nil {
-		t.Error("expected err to exist")
+		t.Fatal("expected err to exist")
 	}
 	if !strings.Contains(err.Error(), "blockservice: key not found") {
 		t.Errorf("unexpected error; %s", err.Error())
 	}
 
 	err = api.Block().Rm(ctx, res.Path())
 	if err == nil {
-		t.Error("expected err to exist")
+		t.Fatal("expected err to exist")
 	}
 	if !strings.Contains(err.Error(), "blockstore: block not found") {
 		t.Errorf("unexpected error; %s", err.Error())