PM-10874: Prompt for biometrics after switching accounts (#3753)

app/src/main/java/com/x8bit/bitwarden/ui/auth/feature/vaultunlock/VaultUnlockViewModel.kt

@@ -101,14 +101,7 @@ class VaultUnlockViewModel @Inject constructor(
             }
             .launchIn(viewModelScope)
 
-        val cipher = biometricsEncryptionManager.getOrCreateCipher(state.userId)
-        if (state.showBiometricLogin && cipher != null) {
-            sendEvent(
-                VaultUnlockEvent.PromptForBiometrics(
-                    cipher = cipher,
-                ),
-            )
-        }
+        promptForBiometricsIfAvailable()
     }
 
     override fun onCleared() {
@@ -320,6 +313,20 @@ class VaultUnlockViewModel @Inject constructor(
                 input = "",
             )
         }
+
+        // If the new account has biometrics available, automatically prompt for biometrics.
+        promptForBiometricsIfAvailable()
+    }
+
+    private fun promptForBiometricsIfAvailable() {
+        val cipher = biometricsEncryptionManager.getOrCreateCipher(state.userId)
+        if (state.showBiometricLogin && cipher != null) {
+            sendEvent(
+                VaultUnlockEvent.PromptForBiometrics(
+                    cipher = cipher,
+                ),
+            )
+        }
     }
 }
 

app/src/test/java/com/x8bit/bitwarden/ui/auth/feature/vaultunlock/VaultUnlockViewModelTest.kt

@@ -430,6 +430,31 @@ class VaultUnlockViewModelTest : BaseViewModelTest() {
         verify { authRepository.switchAccount(userId = updatedUserId) }
     }
 
+    @Test
+    fun `switching accounts should prompt for biometrics if new account has biometrics enabled`() =
+        runTest {
+            val account = DEFAULT_ACCOUNT.copy(
+                isVaultUnlocked = false,
+                isBiometricsEnabled = true,
+                )
+            val initialState = DEFAULT_STATE.copy(isBiometricsValid = true)
+            val viewModel = createViewModel(state = initialState)
+            mutableUserStateFlow.update {
+                it?.copy(
+                    activeUserId = account.userId,
+                    accounts = listOf(account),
+                )
+            }
+
+            viewModel.eventFlow.test {
+                assertEquals(VaultUnlockEvent.PromptForBiometrics(CIPHER), awaitItem())
+                expectNoEvents()
+            }
+            verify {
+                encryptionManager.getOrCreateCipher(USER_ID)
+            }
+        }
+
     @Test
     fun `on UnlockClick for password unlock should display error dialog on AuthenticationError`() {
         val password = "abcd1234"