Refactoring: organise test code

tests/test_currentCustomerAccountBalance.c

@@ -13,6 +13,9 @@ void tearDown(void)
 }
 
 void test_fetchBalanceFromBalanceString(void) {
+
+    /* Arrange */
+
     char  balanceString[5][100] = {
         "balance=0",
         "balance=100",
@@ -21,6 +24,8 @@ void test_fetchBalanceFromBalanceString(void) {
         "balance=400"
     };
 
+    /* Act */
+
     float balance = 0;
     float result[5];
     float expected[5];
@@ -29,6 +34,8 @@ void test_fetchBalanceFromBalanceString(void) {
         result[i] = fetchBalanceFromBalanceString(balanceString[i]);
     }
 
+    /* Assert */
+
     for (int i = 0; i < 5; i++) {
         expected[i] = balance;
         balance += 100;
@@ -44,6 +51,8 @@ void test_fetchBalanceFromBalanceString(void) {
 
 void test_checkFileOpen(void) {
 
+    /* Act and assert */
+
     FILE *file = fopen(CUSTOMER_DATA_FILE, "r");
 
     TEST_ASSERT_TRUE(file);
@@ -52,6 +61,9 @@ void test_checkFileOpen(void) {
 }
 
 void test_failOpenFile(void) {
+
+    /* Act and assert */
+
     FILE *file = fopen("false_file_name", "r");
 
     TEST_ASSERT_FALSE(file);
@@ -59,11 +71,14 @@ void test_failOpenFile(void) {
 }
 
 void test_getAvailableAccountBalance(void) {
-    int user_id = 1234;
+
+    /* Act and assert */
+
+    int user_id = 1234; // Random user_id (because idea is to read the file and get a float value)
     float max   = FLT_MAX;
     int result  = getAvailableAccountBalance(user_id);
     
-    TEST_ASSERT_TRUE(result < max);
+    TEST_ASSERT_TRUE(result < max); // Pass if function is successfully called and a float value (balance) is returned
 }