Datastore Example 1

Datastore Example showing setup

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For detailed documentation that includes this code sample, see the following:

Code sample

Go

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries. For more information, see the Datastore mode Go API reference documentation.

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

func TestWithdrawLowBal(t *testing.T) {
	ctx, done, err := aetest.NewContext()
	if err != nil {
		t.Fatal(err)
	}
	defer done()
	key := datastore.NewKey(ctx, "BankAccount", "", 1, nil)
	if _, err := datastore.Put(ctx, key, &BankAccount{100}); err != nil {
		t.Fatal(err)
	}

	err = withdraw(ctx, "myid", 128, 0)
	if err == nil || err.Error() != "insufficient funds" {
		t.Errorf("Error: %v; want insufficient funds error", err)
	}

	b := BankAccount{}
	if err := datastore.Get(ctx, key, &b); err != nil {
		t.Fatal(err)
	}
	if bal, want := b.Balance, 100; bal != want {
		t.Errorf("Balance %d, want %d", bal, want)
	}
}

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