Ensure API create_wallet returns failure when provided with invalid mnemonic seeds (#319)

* Ensure  returns failure with invalid mnemonic seeds, add tests

* test fixes resulting from change

impls/src/lifecycle/default.rs

@@ -183,7 +183,16 @@ where
 				return Err(ErrorKind::WalletSeedExists(msg))?;
 			}
 		}
-		let _ = WalletSeed::init_file(&data_dir_name, mnemonic_length, mnemonic.clone(), password);
+		WalletSeed::init_file(
+			&data_dir_name,
+			mnemonic_length,
+			mnemonic.clone(),
+			password,
+			test_mode,
+		)
+		.context(ErrorKind::Lifecycle(
+			"Error creating wallet seed (is mnemonic valid?)".into(),
+		))?;
 		info!("Wallet seed file created");
 		let mut wallet: LMDBBackend<'a, C, K> =
 			match LMDBBackend::new(&data_dir_name, self.node_client.clone()) {
@@ -327,6 +336,7 @@ where
 			0,
 			Some(ZeroingString::from(orig_mnemonic)),
 			new.clone(),
+			false,
 		);
 		info!("Wallet seed file created");
 

impls/src/lifecycle/seed.rs

@@ -150,6 +150,7 @@ impl WalletSeed {
 		seed_length: usize,
 		recovery_phrase: Option<util::ZeroingString>,
 		password: util::ZeroingString,
+		test_mode: bool,
 	) -> Result<WalletSeed, Error> {
 		// create directory if it doesn't exist
 		fs::create_dir_all(data_file_dir).context(ErrorKind::IO)?;
@@ -158,8 +159,9 @@ impl WalletSeed {
 
 		warn!("Generating wallet seed file at: {}", seed_file_path);
 		let exists = WalletSeed::seed_file_exists(data_file_dir)?;
-		if exists {
+		if exists && !test_mode {
 			let msg = format!("Wallet seed already exists at: {}", data_file_dir);
+			error!("{}", msg);
 			return Err(ErrorKind::WalletSeedExists(msg))?;
 		}