From 55591f72c771aab6a828349c5f63080682a3764d Mon Sep 17 00:00:00 2001
From: Andrew Stewart Gibson <andrew@commonwealthlabs.co.uk>
Date: Wed, 12 Nov 2025 20:53:43 +0000
Subject: [PATCH 1/3] feat: step 1

---
 cwl_tsql/sql/DDL/001-create_table_product.sql |  4 ++
 cwl_tsql/sql/DDL/002-create_table_basket.sql  |  5 +++
 .../003-alter_table_basket_customer_id.sql    |  3 ++
 cwl_tsql/sql/DML/generate_receipt.sql         | 10 +++++
 cwl_tsql/sql/DML/scan_product.sql             |  2 +
 cwl_tsql/sql/fixtures/_begin_test.sql         |  4 ++
 cwl_tsql/sql/fixtures/_end_test.sql           | 10 +++++
 .../fixtures/assert_actual_eq_expected.sql    |  5 +++
 .../fixtures/assert_actual_like_expected.sql  |  5 +++
 cwl_tsql/sql/run_tests.sh                     | 16 ++++++++
 cwl_tsql/sql/seed/merge_products.sql          | 22 +++++++++++
 ..._receipt_should_include_added_products.sql | 32 ++++++++++++++++
 ...rate_receipt_should_count_each_product.sql | 38 +++++++++++++++++++
 13 files changed, 156 insertions(+)
 create mode 100644 cwl_tsql/sql/DDL/001-create_table_product.sql
 create mode 100644 cwl_tsql/sql/DDL/002-create_table_basket.sql
 create mode 100644 cwl_tsql/sql/DDL/003-alter_table_basket_customer_id.sql
 create mode 100644 cwl_tsql/sql/DML/generate_receipt.sql
 create mode 100644 cwl_tsql/sql/DML/scan_product.sql
 create mode 100644 cwl_tsql/sql/fixtures/_begin_test.sql
 create mode 100644 cwl_tsql/sql/fixtures/_end_test.sql
 create mode 100644 cwl_tsql/sql/fixtures/assert_actual_eq_expected.sql
 create mode 100644 cwl_tsql/sql/fixtures/assert_actual_like_expected.sql
 create mode 100755 cwl_tsql/sql/run_tests.sh
 create mode 100644 cwl_tsql/sql/seed/merge_products.sql
 create mode 100644 cwl_tsql/sql/tests/001 - generate_receipt_should_include_added_products.sql
 create mode 100644 cwl_tsql/sql/tests/002 - generate_receipt_should_count_each_product.sql

diff --git a/cwl_tsql/sql/DDL/001-create_table_product.sql b/cwl_tsql/sql/DDL/001-create_table_product.sql
new file mode 100644
index 0000000..8314970
--- /dev/null
+++ b/cwl_tsql/sql/DDL/001-create_table_product.sql
@@ -0,0 +1,4 @@
+CREATE TABLE Product (
+    Id INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
+    [Name] NVARCHAR(50)
+)
\ No newline at end of file
diff --git a/cwl_tsql/sql/DDL/002-create_table_basket.sql b/cwl_tsql/sql/DDL/002-create_table_basket.sql
new file mode 100644
index 0000000..5521db8
--- /dev/null
+++ b/cwl_tsql/sql/DDL/002-create_table_basket.sql
@@ -0,0 +1,5 @@
+CREATE TABLE Basket (
+    Id INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
+    ProductId INT NOT NULL
+    CONSTRAINT FK_Basket_Product FOREIGN KEY (ProductId) REFERENCES Product(Id)
+)
\ No newline at end of file
diff --git a/cwl_tsql/sql/DDL/003-alter_table_basket_customer_id.sql b/cwl_tsql/sql/DDL/003-alter_table_basket_customer_id.sql
new file mode 100644
index 0000000..cc369bb
--- /dev/null
+++ b/cwl_tsql/sql/DDL/003-alter_table_basket_customer_id.sql
@@ -0,0 +1,3 @@
+ALTER TABLE basket
+ADD CustomerId VARCHAR(100) NOT NULL
+;
diff --git a/cwl_tsql/sql/DML/generate_receipt.sql b/cwl_tsql/sql/DML/generate_receipt.sql
new file mode 100644
index 0000000..affa020
--- /dev/null
+++ b/cwl_tsql/sql/DML/generate_receipt.sql
@@ -0,0 +1,10 @@
+SELECT
+    CONCAT(i, ') ', [Name], '. ', quantity)
+FROM (
+    SELECT
+        p.[Name],
+        COUNT(1) as quantity,
+        DENSE_RANK() OVER (ORDER BY p.[Name]) AS i
+    FROM dbo.Basket b JOIN dbo.Product p ON b.ProductId = p.Id
+    GROUP BY p.[Name]
+) x
\ No newline at end of file
diff --git a/cwl_tsql/sql/DML/scan_product.sql b/cwl_tsql/sql/DML/scan_product.sql
new file mode 100644
index 0000000..a142605
--- /dev/null
+++ b/cwl_tsql/sql/DML/scan_product.sql
@@ -0,0 +1,2 @@
+INSERT INTO dbo.Basket (ProductId, CustomerId)
+VALUES (@ProductId, @CustomerId)
\ No newline at end of file
diff --git a/cwl_tsql/sql/fixtures/_begin_test.sql b/cwl_tsql/sql/fixtures/_begin_test.sql
new file mode 100644
index 0000000..f89c5f6
--- /dev/null
+++ b/cwl_tsql/sql/fixtures/_begin_test.sql
@@ -0,0 +1,4 @@
+DECLARE @msg NVARCHAR(MAX);
+
+BEGIN TRANSACTION test;
+BEGIN TRY
\ No newline at end of file
diff --git a/cwl_tsql/sql/fixtures/_end_test.sql b/cwl_tsql/sql/fixtures/_end_test.sql
new file mode 100644
index 0000000..0836a84
--- /dev/null
+++ b/cwl_tsql/sql/fixtures/_end_test.sql
@@ -0,0 +1,10 @@
+
+    ROLLBACK TRANSACTION test;
+
+END TRY
+BEGIN CATCH
+
+    ROLLBACK TRANSACTION test;
+    THROW;
+
+END CATCH
\ No newline at end of file
diff --git a/cwl_tsql/sql/fixtures/assert_actual_eq_expected.sql b/cwl_tsql/sql/fixtures/assert_actual_eq_expected.sql
new file mode 100644
index 0000000..8978211
--- /dev/null
+++ b/cwl_tsql/sql/fixtures/assert_actual_eq_expected.sql
@@ -0,0 +1,5 @@
+IF (@actual <> @expected)
+BEGIN
+    PRINT FORMATMESSAGE(N'Expected: %s  Actual: %s', COALESCE(@expected, '<null>'), COALESCE(@actual, '<null>'));
+    THROW 50000, @msg, 1;
+END
\ No newline at end of file
diff --git a/cwl_tsql/sql/fixtures/assert_actual_like_expected.sql b/cwl_tsql/sql/fixtures/assert_actual_like_expected.sql
new file mode 100644
index 0000000..8e6d270
--- /dev/null
+++ b/cwl_tsql/sql/fixtures/assert_actual_like_expected.sql
@@ -0,0 +1,5 @@
+IF NOT(@actual LIKE @expected)
+BEGIN
+    PRINT FORMATMESSAGE(N'Expected: %s  Actual: %s', COALESCE(@expected, '<null>'), COALESCE(@actual, '<null>'));
+    THROW 50000, @msg, 1;
+END
\ No newline at end of file
diff --git a/cwl_tsql/sql/run_tests.sh b/cwl_tsql/sql/run_tests.sh
new file mode 100755
index 0000000..3906261
--- /dev/null
+++ b/cwl_tsql/sql/run_tests.sh
@@ -0,0 +1,16 @@
+PASSWORD='Password1!'
+TEST_DIR="./tests"
+
+for test_file in "$TEST_DIR"/*.sql; do
+  test_name=$(basename "$test_file")
+
+  # Run test
+  if sqlcmd -S ::1 -d supermarket -C -U sa -P "$PASSWORD" -b -i "$test_file" > /tmp/sql_test_output 2>&1; then
+    echo "_/ PASS: $test_name"
+  else
+    echo " X FAIL: $test_name"
+    sed 's/^/      /' /tmp/sql_test_output | tail -n 10   # show last few lines of output
+  fi
+
+  echo
+done
\ No newline at end of file
diff --git a/cwl_tsql/sql/seed/merge_products.sql b/cwl_tsql/sql/seed/merge_products.sql
new file mode 100644
index 0000000..5bc37a7
--- /dev/null
+++ b/cwl_tsql/sql/seed/merge_products.sql
@@ -0,0 +1,22 @@
+DECLARE @SummaryOfChanges TABLE (Change VARCHAR(20))
+;
+
+MERGE INTO
+    dbo.Product AS tgt
+USING
+    (VALUES
+        ('Milk'),
+        ('Bread')
+    ) AS src([Name])
+ON tgt.[Name] = src.[Name]
+WHEN NOT MATCHED BY TARGET THEN
+    INSERT ([Name])
+    VALUES (src.[Name])
+OUTPUT $action
+INTO @SummaryOfChanges
+;
+
+SELECT      Change, COUNT(*) as ChangeCount
+FROM        @SummaryOfChanges
+GROUP BY    Change
+;
diff --git a/cwl_tsql/sql/tests/001 - generate_receipt_should_include_added_products.sql b/cwl_tsql/sql/tests/001 - generate_receipt_should_include_added_products.sql
new file mode 100644
index 0000000..fc95ff6
--- /dev/null
+++ b/cwl_tsql/sql/tests/001 - generate_receipt_should_include_added_products.sql	
@@ -0,0 +1,32 @@
+-- ARRANGE
+SET NOCOUNT ON;
+
+DECLARE @CustomerId UNIQUEIDENTIFIER = NEWID()
+DECLARE @MilkId INT
+DECLARE @BreadId INT
+DECLARE @ProductId INT
+
+SELECT @MilkId = p.Id FROM dbo.Product p WHERE p.[Name] = 'Milk'
+SELECT @BreadId = p.Id FROM dbo.Product p WHERE p.[Name] = 'Bread'
+
+DECLARE @actual NVARCHAR(MAX), @expected NVARCHAR(MAX)
+CREATE TABLE #result ( x NVARCHAR(MAX) )
+
+:r ./fixtures/_begin_test.sql
+
+-- ACT
+SET @ProductId = @MilkId
+:r ./DML/scan_product.sql
+
+SET @ProductId = @BreadId
+:r ./DML/scan_product.sql
+
+INSERT INTO #result
+:r ./DML/generate_receipt.sql
+
+-- ASSERT
+SELECT @actual = STRING_AGG(x, '\n') FROM #result
+SELECT @expected = '%1) Bread.%2) Milk.%'
+:r ./fixtures/assert_actual_like_expected.sql
+
+:r ./fixtures/_end_test.sql
\ No newline at end of file
diff --git a/cwl_tsql/sql/tests/002 - generate_receipt_should_count_each_product.sql b/cwl_tsql/sql/tests/002 - generate_receipt_should_count_each_product.sql
new file mode 100644
index 0000000..5395a1a
--- /dev/null
+++ b/cwl_tsql/sql/tests/002 - generate_receipt_should_count_each_product.sql	
@@ -0,0 +1,38 @@
+-- ARRANGE
+SET NOCOUNT ON;
+
+DECLARE @CustomerId UNIQUEIDENTIFIER = NEWID()
+DECLARE @MilkId INT
+DECLARE @BreadId INT
+DECLARE @ProductId INT
+
+SELECT @MilkId = p.Id FROM dbo.Product p WHERE p.[Name] = 'Milk'
+SELECT @BreadId = p.Id FROM dbo.Product p WHERE p.[Name] = 'Bread'
+
+DECLARE @actual NVARCHAR(MAX), @expected NVARCHAR(MAX)
+CREATE TABLE #result ( x NVARCHAR(MAX) )
+
+:r ./fixtures/_begin_test.sql
+
+-- ACT
+SET @ProductId = @MilkId
+:r ./DML/scan_product.sql
+:r ./DML/scan_product.sql
+
+SET @ProductId = @BreadId
+:r ./DML/scan_product.sql
+
+INSERT INTO #result
+:r ./DML/generate_receipt.sql
+
+-- ASSERT
+SELECT @actual = STRING_AGG(x, '\n') FROM #result
+SELECT @expected = '%Bread. 1%'
+:r ./fixtures/assert_actual_like_expected.sql
+
+
+SELECT @expected = '%Milk. 2%'
+:r ./fixtures/assert_actual_like_expected.sql
+
+
+:r ./fixtures/_end_test.sql
\ No newline at end of file

From 39282e6c7a90cfbbfef424747f11e92b50ce25b8 Mon Sep 17 00:00:00 2001
From: Andrew Stewart Gibson <andrew@commonwealthlabs.co.uk>
Date: Wed, 12 Nov 2025 21:05:27 +0000
Subject: [PATCH 2/3] feat: add product price

---
 cwl_tsql/README.md                            |  7 ++++
 .../DDL/004-alter_table_product_add_price.sql |  2 +
 cwl_tsql/sql/DML/generate_receipt.sql         |  5 ++-
 cwl_tsql/sql/run_tests.sh                     |  3 +-
 cwl_tsql/sql/seed/merge_products.sql          | 12 +++---
 ... generate_receipt_should_include_price.sql | 38 +++++++++++++++++++
 6 files changed, 59 insertions(+), 8 deletions(-)
 create mode 100644 cwl_tsql/README.md
 create mode 100644 cwl_tsql/sql/DDL/004-alter_table_product_add_price.sql
 create mode 100644 cwl_tsql/sql/tests/003 - generate_receipt_should_include_price.sql

diff --git a/cwl_tsql/README.md b/cwl_tsql/README.md
new file mode 100644
index 0000000..8c3667e
--- /dev/null
+++ b/cwl_tsql/README.md
@@ -0,0 +1,7 @@
+Assumes a local server (see the run_tests.sh to configure server and password). Make sure you don't use sa for this very important data.
+
+To run the tests:
+```
+cd sql
+./run_tests.sh
+```
\ No newline at end of file
diff --git a/cwl_tsql/sql/DDL/004-alter_table_product_add_price.sql b/cwl_tsql/sql/DDL/004-alter_table_product_add_price.sql
new file mode 100644
index 0000000..c83807e
--- /dev/null
+++ b/cwl_tsql/sql/DDL/004-alter_table_product_add_price.sql
@@ -0,0 +1,2 @@
+ALTER TABLE dbo.Product
+ADD Price DECIMAL(10,2) NOT NULL DEFAULT(0)
\ No newline at end of file
diff --git a/cwl_tsql/sql/DML/generate_receipt.sql b/cwl_tsql/sql/DML/generate_receipt.sql
index affa020..af81c0b 100644
--- a/cwl_tsql/sql/DML/generate_receipt.sql
+++ b/cwl_tsql/sql/DML/generate_receipt.sql
@@ -1,10 +1,11 @@
 SELECT
-    CONCAT(i, ') ', [Name], '. ', quantity)
+    CONCAT(i, ') ', [Name], '. ', quantity, ' @ £', price)
 FROM (
     SELECT
         p.[Name],
+        p.Price,
         COUNT(1) as quantity,
         DENSE_RANK() OVER (ORDER BY p.[Name]) AS i
     FROM dbo.Basket b JOIN dbo.Product p ON b.ProductId = p.Id
-    GROUP BY p.[Name]
+    GROUP BY p.[Name], p.Price
 ) x
\ No newline at end of file
diff --git a/cwl_tsql/sql/run_tests.sh b/cwl_tsql/sql/run_tests.sh
index 3906261..c987c78 100755
--- a/cwl_tsql/sql/run_tests.sh
+++ b/cwl_tsql/sql/run_tests.sh
@@ -1,11 +1,12 @@
 PASSWORD='Password1!'
+SERVER='::1'
 TEST_DIR="./tests"
 
 for test_file in "$TEST_DIR"/*.sql; do
   test_name=$(basename "$test_file")
 
   # Run test
-  if sqlcmd -S ::1 -d supermarket -C -U sa -P "$PASSWORD" -b -i "$test_file" > /tmp/sql_test_output 2>&1; then
+  if sqlcmd -S "$SERVER" -d supermarket -C -U sa -P "$PASSWORD" -b -i "$test_file" > /tmp/sql_test_output 2>&1; then
     echo "_/ PASS: $test_name"
   else
     echo " X FAIL: $test_name"
diff --git a/cwl_tsql/sql/seed/merge_products.sql b/cwl_tsql/sql/seed/merge_products.sql
index 5bc37a7..58e1037 100644
--- a/cwl_tsql/sql/seed/merge_products.sql
+++ b/cwl_tsql/sql/seed/merge_products.sql
@@ -5,13 +5,15 @@ MERGE INTO
     dbo.Product AS tgt
 USING
     (VALUES
-        ('Milk'),
-        ('Bread')
-    ) AS src([Name])
+        ('Milk', 1.5),
+        ('Bread', 3.5)
+    ) AS src([Name], Price)
 ON tgt.[Name] = src.[Name]
+WHEN MATCHED THEN
+    UPDATE SET Price = src.Price
 WHEN NOT MATCHED BY TARGET THEN
-    INSERT ([Name])
-    VALUES (src.[Name])
+    INSERT ([Name], Price)
+    VALUES (src.[Name], src.Price)
 OUTPUT $action
 INTO @SummaryOfChanges
 ;
diff --git a/cwl_tsql/sql/tests/003 - generate_receipt_should_include_price.sql b/cwl_tsql/sql/tests/003 - generate_receipt_should_include_price.sql
new file mode 100644
index 0000000..7fb6e47
--- /dev/null
+++ b/cwl_tsql/sql/tests/003 - generate_receipt_should_include_price.sql	
@@ -0,0 +1,38 @@
+-- ARRANGE
+SET NOCOUNT ON;
+
+DECLARE @CustomerId UNIQUEIDENTIFIER = NEWID()
+DECLARE @MilkId INT
+DECLARE @BreadId INT
+DECLARE @ProductId INT
+
+SELECT @MilkId = p.Id FROM dbo.Product p WHERE p.[Name] = 'Milk'
+SELECT @BreadId = p.Id FROM dbo.Product p WHERE p.[Name] = 'Bread'
+
+DECLARE @actual NVARCHAR(MAX), @expected NVARCHAR(MAX)
+CREATE TABLE #result ( x NVARCHAR(MAX) )
+
+:r ./fixtures/_begin_test.sql
+
+-- ACT
+SET @ProductId = @MilkId
+:r ./DML/scan_product.sql
+:r ./DML/scan_product.sql
+
+SET @ProductId = @BreadId
+:r ./DML/scan_product.sql
+
+INSERT INTO #result
+:r ./DML/generate_receipt.sql
+
+-- ASSERT
+SELECT @actual = STRING_AGG(x, '\n') FROM #result
+SELECT @expected = '%Bread. 1 @ £3.50%'
+:r ./fixtures/assert_actual_like_expected.sql
+
+
+SELECT @expected = '%Milk. 2 @ £1.50%'
+:r ./fixtures/assert_actual_like_expected.sql
+
+
+:r ./fixtures/_end_test.sql
\ No newline at end of file

From bb65e7a1dfc0f0c424c7074332dc5bf98fb279cd Mon Sep 17 00:00:00 2001
From: Andrew Stewart Gibson <andrew@commonwealthlabs.co.uk>
Date: Wed, 12 Nov 2025 21:07:19 +0000
Subject: [PATCH 3/3] feat: line totals

---
 cwl_tsql/sql/DML/generate_receipt.sql         |  2 +-
 ...rate_receipt_should_include_line_total.sql | 38 +++++++++++++++++++
 2 files changed, 39 insertions(+), 1 deletion(-)
 create mode 100644 cwl_tsql/sql/tests/004 - generate_receipt_should_include_line_total.sql

diff --git a/cwl_tsql/sql/DML/generate_receipt.sql b/cwl_tsql/sql/DML/generate_receipt.sql
index af81c0b..17fbe06 100644
--- a/cwl_tsql/sql/DML/generate_receipt.sql
+++ b/cwl_tsql/sql/DML/generate_receipt.sql
@@ -1,5 +1,5 @@
 SELECT
-    CONCAT(i, ') ', [Name], '. ', quantity, ' @ £', price)
+    CONCAT(i, ') ', [Name], '. ', quantity, ' @ £', price, " = £", price * quantity)
 FROM (
     SELECT
         p.[Name],
diff --git a/cwl_tsql/sql/tests/004 - generate_receipt_should_include_line_total.sql b/cwl_tsql/sql/tests/004 - generate_receipt_should_include_line_total.sql
new file mode 100644
index 0000000..0f21112
--- /dev/null
+++ b/cwl_tsql/sql/tests/004 - generate_receipt_should_include_line_total.sql	
@@ -0,0 +1,38 @@
+-- ARRANGE
+SET NOCOUNT ON;
+
+DECLARE @CustomerId UNIQUEIDENTIFIER = NEWID()
+DECLARE @MilkId INT
+DECLARE @BreadId INT
+DECLARE @ProductId INT
+
+SELECT @MilkId = p.Id FROM dbo.Product p WHERE p.[Name] = 'Milk'
+SELECT @BreadId = p.Id FROM dbo.Product p WHERE p.[Name] = 'Bread'
+
+DECLARE @actual NVARCHAR(MAX), @expected NVARCHAR(MAX)
+CREATE TABLE #result ( x NVARCHAR(MAX) )
+
+:r ./fixtures/_begin_test.sql
+
+-- ACT
+SET @ProductId = @MilkId
+:r ./DML/scan_product.sql
+:r ./DML/scan_product.sql
+
+SET @ProductId = @BreadId
+:r ./DML/scan_product.sql
+
+INSERT INTO #result
+:r ./DML/generate_receipt.sql
+
+-- ASSERT
+SELECT @actual = STRING_AGG(x, '\n') FROM #result
+SELECT @expected = '%Bread. 1 @ £3.50 = £3.50%'
+:r ./fixtures/assert_actual_like_expected.sql
+
+
+SELECT @expected = '%Milk. 2 @ £1.50 = £3.00%'
+:r ./fixtures/assert_actual_like_expected.sql
+
+
+:r ./fixtures/_end_test.sql
\ No newline at end of file