From 27d4857f3c57887dcab60c5affd9f117117b764a Mon Sep 17 00:00:00 2001
From: Drew Bednar <drew@runcible.io>
Date: Mon, 17 Jun 2024 17:03:39 -0400
Subject: [PATCH] Saving pointers work

---
 learn_go_with_tests/arrays/sum_test.go          |  1 +
 learn_go_with_tests/pointers_errors/README.md   |  4 ++++
 learn_go_with_tests/pointers_errors/go.mod      |  3 +++
 learn_go_with_tests/pointers_errors/wallet.go   | 12 ++++++++++++
 .../pointers_errors/wallet_test.go              | 17 +++++++++++++++++
 learn_go_with_tests/structs/README.md           |  2 +-
 6 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 learn_go_with_tests/pointers_errors/README.md
 create mode 100644 learn_go_with_tests/pointers_errors/go.mod
 create mode 100644 learn_go_with_tests/pointers_errors/wallet.go
 create mode 100644 learn_go_with_tests/pointers_errors/wallet_test.go

diff --git a/learn_go_with_tests/arrays/sum_test.go b/learn_go_with_tests/arrays/sum_test.go
index 1c275e0..99de6f7 100644
--- a/learn_go_with_tests/arrays/sum_test.go
+++ b/learn_go_with_tests/arrays/sum_test.go
@@ -86,6 +86,7 @@ func TestSumAll(t *testing.T) {
 func TestSumAllTails(t *testing.T) {
 
 	// Another example of helper function
+	// By defining this function inside the test, it cannot be used by other functions in this package.
 	checkSums := func(t testing.TB, got, want []int) {
 		t.Helper()
 		if !reflect.DeepEqual(got, want) {
diff --git a/learn_go_with_tests/pointers_errors/README.md b/learn_go_with_tests/pointers_errors/README.md
new file mode 100644
index 0000000..4496445
--- /dev/null
+++ b/learn_go_with_tests/pointers_errors/README.md
@@ -0,0 +1,4 @@
+# Pointers and Errors
+
+https://quii.gitbook.io/learn-go-with-tests/go-fundamentals/pointers-and-errors
+
diff --git a/learn_go_with_tests/pointers_errors/go.mod b/learn_go_with_tests/pointers_errors/go.mod
new file mode 100644
index 0000000..29c1b86
--- /dev/null
+++ b/learn_go_with_tests/pointers_errors/go.mod
@@ -0,0 +1,3 @@
+module pointers_errors
+
+go 1.21.0
diff --git a/learn_go_with_tests/pointers_errors/wallet.go b/learn_go_with_tests/pointers_errors/wallet.go
new file mode 100644
index 0000000..cde9e66
--- /dev/null
+++ b/learn_go_with_tests/pointers_errors/wallet.go
@@ -0,0 +1,12 @@
+package pointers_errors
+
+type Wallet struct {
+	balance int
+}
+
+func (w Wallet) Deposit(amount int) {
+}
+
+func (w Wallet) Balance() int {
+	return 0
+}
diff --git a/learn_go_with_tests/pointers_errors/wallet_test.go b/learn_go_with_tests/pointers_errors/wallet_test.go
new file mode 100644
index 0000000..32de526
--- /dev/null
+++ b/learn_go_with_tests/pointers_errors/wallet_test.go
@@ -0,0 +1,17 @@
+package pointers_errors
+
+import "testing"
+
+func TestWallet(t *testing.T) {
+
+	wallet := Wallet{}
+
+	wallet.Deposit(10)
+
+	got := wallet.Balance()
+	want := 10
+
+	if got != want {
+		t.Errorf("got %d want %d", got, want)
+	}
+}
diff --git a/learn_go_with_tests/structs/README.md b/learn_go_with_tests/structs/README.md
index b695dce..f8d5f5f 100644
--- a/learn_go_with_tests/structs/README.md
+++ b/learn_go_with_tests/structs/README.md
@@ -4,4 +4,4 @@ You can run individual tests like:
 
 ```
 go test -run TestArea/Rectangle
-```
+```
\ No newline at end of file