the official T-SQL TDD version

cwl_tsql/README.md

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+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
+```

cwl_tsql/sql/DDL/001-create_table_product.sql

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+CREATE TABLE Product (
+    Id INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
+    [Name] NVARCHAR(50)
+)

cwl_tsql/sql/DDL/002-create_table_basket.sql

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+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)
+)

cwl_tsql/sql/DDL/003-alter_table_basket_customer_id.sql

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+ALTER TABLE basket
+ADD CustomerId VARCHAR(100) NOT NULL
+;

cwl_tsql/sql/DDL/004-alter_table_product_add_price.sql

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+ALTER TABLE dbo.Product
+ADD Price DECIMAL(10,2) NOT NULL DEFAULT(0)

cwl_tsql/sql/DML/generate_receipt.sql

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+SELECT
+    CONCAT(i, ') ', [Name], '. ', quantity, ' @ £', price, " = £", price * quantity)
+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], p.Price
+) x

cwl_tsql/sql/DML/scan_product.sql

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+INSERT INTO dbo.Basket (ProductId, CustomerId)
+VALUES (@ProductId, @CustomerId)

cwl_tsql/sql/fixtures/_begin_test.sql

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+DECLARE @msg NVARCHAR(MAX);
+
+BEGIN TRANSACTION test;
+BEGIN TRY

cwl_tsql/sql/fixtures/_end_test.sql

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+
+    ROLLBACK TRANSACTION test;
+
+END TRY
+BEGIN CATCH
+
+    ROLLBACK TRANSACTION test;
+    THROW;
+
+END CATCH

cwl_tsql/sql/fixtures/assert_actual_eq_expected.sql

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+IF (@actual <> @expected)
+BEGIN
+    PRINT FORMATMESSAGE(N'Expected: %s  Actual: %s', COALESCE(@expected, '<null>'), COALESCE(@actual, '<null>'));
+    THROW 50000, @msg, 1;
+END

cwl_tsql/sql/fixtures/assert_actual_like_expected.sql

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+IF NOT(@actual LIKE @expected)
+BEGIN
+    PRINT FORMATMESSAGE(N'Expected: %s  Actual: %s', COALESCE(@expected, '<null>'), COALESCE(@actual, '<null>'));
+    THROW 50000, @msg, 1;
+END

cwl_tsql/sql/run_tests.sh

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+PASSWORD='Password1!'
+SERVER='::1'
+TEST_DIR="./tests"
+
+for test_file in "$TEST_DIR"/*.sql; do
+  test_name=$(basename "$test_file")
+
+  # Run test
+  if sqlcmd -S "$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"
+    sed 's/^/      /' /tmp/sql_test_output | tail -n 10   # show last few lines of output
+  fi
+
+  echo
+done

cwl_tsql/sql/seed/merge_products.sql

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+DECLARE @SummaryOfChanges TABLE (Change VARCHAR(20))
+;
+
+MERGE INTO
+    dbo.Product AS tgt
+USING
+    (VALUES
+        ('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], Price)
+    VALUES (src.[Name], src.Price)
+OUTPUT $action
+INTO @SummaryOfChanges
+;
+
+SELECT      Change, COUNT(*) as ChangeCount
+FROM        @SummaryOfChanges
+GROUP BY    Change
+;

cwl_tsql/sql/tests/001 - generate_receipt_should_include_added_products.sql

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+-- 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

cwl_tsql/sql/tests/002 - generate_receipt_should_count_each_product.sql

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+-- 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

cwl_tsql/sql/tests/003 - generate_receipt_should_include_price.sql

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+-- 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

cwl_tsql/sql/tests/004 - generate_receipt_should_include_line_total.sql

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+-- 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