test(table): Migrate internal layout specs to Swift Testing

Tests/TPPDFTests/Internal/Table/PDFTableMergeUtilTests.swift

@@ -0,0 +1,84 @@
+//
+//  PDFTableMergeUtilTests.swift
+//  TPPDF
+//
+//  Created by Philip Niedertscheider on 22.12.2019.
+//  Copyright © 2016-2026 techprimate GmbH. All rights reserved.
+//
+
+import Testing
+@testable import TPPDF
+
+struct PDFTableMergeUtilTests {
+    @Test func unmergedTableReturnsOneNodePerCellWithoutSpans() {
+        // Arrange
+        let table = makeTable()
+
+        // Act
+        let result = PDFTableMergeUtil.calculateMerged(table: table)
+
+        // Assert
+        #expect(result.count == 10)
+        for row in 0..<10 {
+            #expect(result[row].count == 10)
+            for column in 0..<10 {
+                let node = result[row][column]
+                #expect(node.cell === table.cells[row][column])
+                #expect(node.moreRowsSpan == 0)
+                #expect(node.moreColumnsSpan == 0)
+            }
+        }
+    }
+
+    @Test func mergingEachRowReturnsOneNodePerRowSpanningAllColumns() {
+        // Arrange
+        let table = makeTable()
+        for row in 0..<10 {
+            table[row: row].merge()
+        }
+
+        // Act
+        let result = PDFTableMergeUtil.calculateMerged(table: table)
+
+        // Assert
+        #expect(result.count == 10)
+        for row in 0..<10 {
+            #expect(result[row].count == 1)
+            let node = result[row][0]
+            #expect(node.cell === table.cells[row][0])
+            #expect(node.moreRowsSpan == 0)
+            #expect(node.moreColumnsSpan == 9)
+        }
+    }
+
+    @Test func mergingEachColumnReturnsOneNodePerColumnSpanningAllRows() {
+        // Arrange
+        let table = makeTable()
+        for column in 0..<10 {
+            table[column: column].merge()
+        }
+
+        // Act
+        let result = PDFTableMergeUtil.calculateMerged(table: table)
+
+        // Assert
+        #expect(result.count == 1)
+        #expect(result[0].count == 10)
+        for column in 0..<10 {
+            let node = result[0][column]
+            #expect(node.cell === table.cells[0][column])
+            #expect(node.moreRowsSpan == 9)
+            #expect(node.moreColumnsSpan == 0)
+        }
+    }
+
+    private func makeTable() -> PDFTable {
+        let table = PDFTable(rows: 10, columns: 10)
+        for row in 0..<10 {
+            for column in 0..<10 {
+                table[row, column].content = "\(row),\(column)".asTableContent
+            }
+        }
+        return table
+    }
+}