func testAggregateChildPolicyHeadTail()

in PlaygroundLogger/PlaygroundLoggerTests/LogPolicyTests.swift [510:565]
42 lines of code
6 McCabe index (conditional complexity)

    func testAggregateChildPolicyHeadTail() throws {
        let testPolicy = LogPolicy(aggregateChildPolicy: .headTail(headCount: 2, tailCount: 1))

        let logEntry = try LogEntry(describing: TestStruct(), name: "testStruct", policy: testPolicy)

        guard case let .structured(name, _, _, totalChildrenCount, children, disposition) = logEntry else {
            XCTFail("Expected a structured log entry for a struct")
            return
        }

        XCTAssertEqual(name, "testStruct")
        XCTAssertEqual(disposition, .struct)
        XCTAssertEqual(totalChildrenCount, 5)

        guard children.count == 4 else {
            XCTFail("Expected exactly 4 children but have \(children.count)")
            return
        }

        for index in 0..<2 {
            let child = children[index]

            guard case let .opaque(_, typeName, _, _, representation) = child else {
                XCTFail("Expected an opaque log entry for an item in the array")
                continue
            }

            XCTAssertEqual(typeName, "Int")

            guard let integer = representation as? Int64 else {
                XCTFail("Expected an Int64 as the representation for an Int")
                return
            }

            XCTAssertEqual(integer, Int64(index + 1))
        }

        guard case .gap = children[2] else {
            XCTFail("We expect the child at index 2 to be a gap entry indicating that items were omitted")
            return
        }

        guard case let .opaque(_, typeName, _, _, representation) = children[3] else {
            XCTFail("Expected an opaque log entry for the last child")
            return
        }

        XCTAssertEqual(typeName, "Int")

        guard let integer = representation as? Int64 else {
            XCTFail("Expected an Int64 as the representation for an Int")
            return
        }

        XCTAssertEqual(integer, 5)
    }