Implement saving and loading for account data, currently a basic json file

pkg/accounts/accounts_test.go

@@ -0,0 +1,92 @@
+package accounts
+
+import (
+	"testing"
+)
+
+func TestNewAccountant(t *testing.T) {
+	// Very basic verify here for now
+	accountant := NewAccountant()
+	if accountant == nil {
+		t.Error("Failed to create accountant")
+	}
+}
+
+func TestAccountant_RegisterAccount(t *testing.T) {
+
+	accountant := NewAccountant()
+
+	// Start by making two accounts
+
+	namea := "one"
+	a := Account{Name: namea}
+	acca, err := accountant.RegisterAccount(a)
+	if err != nil {
+		t.Error(err)
+	} else if acca.Name != namea {
+		t.Errorf("Missmatched account name after register, expected: %s, actual: %s", namea, acca.Name)
+	}
+
+	nameb := "two"
+	b := Account{Name: nameb}
+	accb, err := accountant.RegisterAccount(b)
+	if err != nil {
+		t.Error(err)
+	} else if accb.Name != nameb {
+		t.Errorf("Missmatched account name after register, expected: %s, actual: %s", nameb, acca.Name)
+	}
+
+	// Verify our accounts have differing IDs
+	if acca.Id == accb.Id {
+		t.Error("Duplicate account IDs fo separate accounts")
+	}
+
+	// Verify another request gets rejected
+	_, err = accountant.RegisterAccount(a)
+	if err == nil {
+		t.Error("Duplicate account name did not produce error")
+	}
+}
+
+func TestAccountant_LoadSave(t *testing.T) {
+	accountant := NewAccountant()
+	if len(accountant.data.Accounts) != 0 {
+		t.Error("New accountant created with non-zero account number")
+	}
+
+	name := "one"
+	a := Account{Name: name}
+	a, err := accountant.RegisterAccount(a)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if len(accountant.data.Accounts) != 1 {
+		t.Error("No new account made")
+	} else if accountant.data.Accounts[0].Name != name {
+		t.Error("New account created with wrong name")
+	}
+
+	// Save out the accountant
+	if err := accountant.Save(); err != nil {
+		t.Error(err)
+	}
+
+	// Re-create the accountant
+	accountant = NewAccountant()
+	if len(accountant.data.Accounts) != 0 {
+		t.Error("New accountant created with non-zero account number")
+	}
+
+	// Load the old accountant data
+	if err := accountant.Load(); err != nil {
+		t.Error(err)
+	}
+
+	// Verify we have the same account again
+	if len(accountant.data.Accounts) != 1 {
+		t.Error("No account after load")
+	} else if accountant.data.Accounts[0].Name != name {
+		t.Error("New account created with wrong name")
+	}
+}