[Payments] Show what's missing for incomplete payment methods.

components/payments/core/autofill_payment_instrument_unittest.cc

Index: components/payments/core/autofill_payment_instrument_unittest.cc
diff --git a/components/payments/core/autofill_payment_instrument_unittest.cc b/components/payments/core/autofill_payment_instrument_unittest.cc
index 7b9db0be6a96b1a828190e7f22a80fa3dcd7c1a8..622a4e90f577f982879a1ed266e13b950e76f14a 100644
--- a/components/payments/core/autofill_payment_instrument_unittest.cc
+++ b/components/payments/core/autofill_payment_instrument_unittest.cc
@@ -5,11 +5,14 @@
 #include "components/payments/core/autofill_payment_instrument.h"
 
 #include "base/macros.h"
+#include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/browser/autofill_profile.h"
 #include "components/autofill/core/browser/autofill_test_utils.h"
 #include "components/autofill/core/browser/credit_card.h"
+#include "components/strings/grit/components_strings.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/l10n/l10n_util.h"
 
 namespace payments {
 
@@ -40,6 +43,7 @@ TEST_F(AutofillPaymentInstrumentTest, IsCompleteForPayment) {
   AutofillPaymentInstrument instrument("visa", local_credit_card(),
                                        billing_profiles(), "en-US", nullptr);
   EXPECT_TRUE(instrument.IsCompleteForPayment());
+  EXPECT_TRUE(instrument.GetMissingInfoLabel().empty());
 }
 
 // An expired local card is not a valid instrument for payment.
@@ -49,6 +53,9 @@ TEST_F(AutofillPaymentInstrumentTest, IsCompleteForPayment_Expired) {
   AutofillPaymentInstrument instrument("visa", card, billing_profiles(),
                                        "en-US", nullptr);
   EXPECT_FALSE(instrument.IsCompleteForPayment());
+  EXPECT_EQ(l10n_util::GetStringUTF16(
+                IDS_PAYMENTS_VALIDATION_INVALID_CREDIT_CARD_EXPIRED),
+            instrument.GetMissingInfoLabel());
 }
 
 // A local card with no name is not a valid instrument for payment.
@@ -56,18 +63,40 @@ TEST_F(AutofillPaymentInstrumentTest, IsCompleteForPayment_NoName) {
   autofill::CreditCard& card = local_credit_card();
   card.SetInfo(autofill::AutofillType(autofill::CREDIT_CARD_NAME_FULL),
                base::ASCIIToUTF16(""), "en-US");
+  base::string16 missing_info;
   AutofillPaymentInstrument instrument("visa", card, billing_profiles(),
                                        "en-US", nullptr);
   EXPECT_FALSE(instrument.IsCompleteForPayment());
+  EXPECT_EQ(l10n_util::GetStringUTF16(IDS_PAYMENTS_NAME_ON_CARD_REQUIRED),
+            instrument.GetMissingInfoLabel());
 }
 
 // A local card with no name is not a valid instrument for payment.
 TEST_F(AutofillPaymentInstrumentTest, IsCompleteForPayment_NoNumber) {
   autofill::CreditCard& card = local_credit_card();
   card.SetNumber(base::ASCIIToUTF16(""));
+  base::string16 missing_info;
   AutofillPaymentInstrument instrument("visa", card, billing_profiles(),
                                        "en-US", nullptr);
   EXPECT_FALSE(instrument.IsCompleteForPayment());
+  EXPECT_EQ(l10n_util::GetStringUTF16(
+                IDS_PAYMENTS_CARD_NUMBER_INVALID_VALIDATION_MESSAGE),
+            instrument.GetMissingInfoLabel());
+}
+
+// A local card with no name and no number is not a valid instrument for
+// payment.
+TEST_F(AutofillPaymentInstrumentTest,
+       IsCompleteForPayment_MultipleThingsMissing) {
+  autofill::CreditCard& card = local_credit_card();
+  card.SetNumber(base::ASCIIToUTF16(""));
+  card.SetInfo(autofill::AutofillType(autofill::CREDIT_CARD_NAME_FULL),
+               base::ASCIIToUTF16(""), "en-US");
+  AutofillPaymentInstrument instrument("visa", card, billing_profiles(),
+                                       "en-US", nullptr);
+  EXPECT_FALSE(instrument.IsCompleteForPayment());
+  EXPECT_EQ(l10n_util::GetStringUTF16(IDS_PAYMENTS_MORE_INFORMATION_REQUIRED),
+            instrument.GetMissingInfoLabel());
 }
 
 // A Masked (server) card is a valid instrument for payment.
@@ -76,6 +105,7 @@ TEST_F(AutofillPaymentInstrumentTest, IsCompleteForPayment_MaskedCard) {
   AutofillPaymentInstrument instrument("visa", card, billing_profiles(),
                                        "en-US", nullptr);
   EXPECT_TRUE(instrument.IsCompleteForPayment());
+  EXPECT_TRUE(instrument.GetMissingInfoLabel().empty());
 }
 
 // An expired masked (server) card is not a valid instrument for payment.
@@ -85,6 +115,9 @@ TEST_F(AutofillPaymentInstrumentTest, IsCompleteForPayment_ExpiredMaskedCard) {
   AutofillPaymentInstrument instrument("visa", card, billing_profiles(),
                                        "en-US", nullptr);
   EXPECT_FALSE(instrument.IsCompleteForPayment());
+  EXPECT_EQ(l10n_util::GetStringUTF16(
+                IDS_PAYMENTS_VALIDATION_INVALID_CREDIT_CARD_EXPIRED),
+            instrument.GetMissingInfoLabel());
 }
 
 // An expired card is a valid instrument for canMakePayment.