diff --git a/docs/circuit-list-editor-api.md b/docs/circuit-list-editor-api.md
index 13afbe9..206f967 100644
--- a/docs/circuit-list-editor-api.md
+++ b/docs/circuit-list-editor-api.md
@@ -389,3 +389,22 @@ inverse command. The former direct restore/reconnect endpoints are removed.
 
 `displayName` is included in the comparison but is not selected by default in the UI. Updating a
 project device never triggers synchronization implicitly.
+
+## Revit CSV Foundation
+
+- `GET /projects/:projectId/external-csv/configuration`
+  - returns the complete versioned project configuration or `null`
+- `PUT /projects/:projectId/external-csv/configuration`
+  - request: `expectedRevision` and the complete validated configuration
+  - executes `external-csv-configuration.update`
+  - returns configuration, revision and project history state
+- `POST /projects/:projectId/external-csv/preview`
+  - request: file name and Base64-encoded CSV content up to 18 MB
+  - requires a stored project configuration
+  - returns transport metadata, SHA-256, row classifications, suspect row
+    numbers and mapped source values for every recognized IFC object
+  - does not persist a draft, mutate project state or create a revision
+
+Parser errors expose stable codes such as `header-not-found`,
+`ambiguous-header`, `invalid-ifc-guid` and `duplicate-ifc-guid`. A later
+confirmed import must upload and parse the file again and verify its hash.
diff --git a/docs/current-architecture.md b/docs/current-architecture.md
index 187d6ed..7c77bee 100644
--- a/docs/current-architecture.md
+++ b/docs/current-architecture.md
@@ -502,6 +502,13 @@ Entfernung zusammen mit Revision und persistentem Undo/Redo. Snapshot-Schema 3,
 Restore und portabler Projekttransfer enthalten diesen Zustand; beim Duplizieren
 werden Konfigurations-UUID und Projektlink remapped. Importvorschau, persistente
 externe Objekte und die Revit-GUI sind noch nicht implementiert.
+`GET` und `PUT /api/projects/:projectId/external-csv/configuration` lesen oder
+ändern die Konfiguration; der PUT plant Identität und nächsten
+Konfigurationsstand serverseitig und verwendet den typisierten Command.
+`POST /api/projects/:projectId/external-csv/preview` nimmt Dateiname und
+Base64-kodierte CSV bis 18 MB entgegen. Der zustandsfreie Service liefert Hash,
+Dialekt, Header, Klassifikationszahlen, Verdachtszeilen und gemappte
+Objektquellwerte. Er schreibt weder Entwurf noch Projektdaten.
 
 ## Noch nicht unterstützt
 
diff --git a/docs/spec/revit-csv-phase-14-audit-and-plan.md b/docs/spec/revit-csv-phase-14-audit-and-plan.md
index f677e26..b99729b 100644
--- a/docs/spec/revit-csv-phase-14-audit-and-plan.md
+++ b/docs/spec/revit-csv-phase-14-audit-and-plan.md
@@ -249,9 +249,11 @@ keine Projektrevision und laufen über einen eigenen Audit-Store.
    synthetische Testdaten; die Referenzdatei steht noch aus.**
 3. Konfiguration über Migration, Snapshot v3, Transfer und den Command
    `external-csv-configuration.update` persistieren. **Erledigt.**
-4. Vorschau-Endpunkt und deutschen Projekt-Wizard ergänzen. Der Server speichert
-   keinen Entwurf: Bei Bestätigung wird die Datei erneut übertragen, erneut
-   geparst und ihr Hash gegen die Vorschau geprüft.
+4. Vorschau-Endpunkt und deutschen Projekt-Wizard ergänzen. **Erledigt:**
+   Konfigurations-Read/Write- und zustandsfreier Vorschau-Endpunkt. **Offen:**
+   deutscher Projekt-Wizard. Der Server speichert keinen Entwurf: Bei
+   Bestätigung wird die Datei erneut übertragen, erneut geparst und ihr Hash
+   gegen die Vorschau geprüft.
 
 Abnahme: fokussierte Tests, vollständige Tests und alle vorgeschriebenen
 Build-/Typecheck-Schritte. Die lokal bereitgestellte Referenz-CSV wird mit
diff --git a/scripts/verify-revit-reference-csv.ts b/scripts/verify-revit-reference-csv.ts
index 7d4f047..07d605b 100644
--- a/scripts/verify-revit-reference-csv.ts
+++ b/scripts/verify-revit-reference-csv.ts
@@ -7,6 +7,7 @@ import {
   parseExternalCsv,
   serializeExternalCsv,
 } from "../src/external-model/csv/external-csv-transport.js";
+import { createExternalCsvPreview } from "../src/external-model/application/external-csv-preview.js";
 
 const filePath = resolve(
   process.argv[2] ?? "docs/spec/ELT Stromkreisnummernvergabe-Check_DIV.csv"
@@ -45,8 +46,14 @@ const nonEmptyPassthroughRows = document.rows.filter(
     row.cells.some((cell) => cell.value !== "")
 ).length;
 const serialized = serializeExternalCsv(document);
+const preview = createExternalCsvPreview({
+  fileName: filePath,
+  bytes: source,
+  configuration,
+});
 
 assert.equal(counts.object, 897, "Expected 897 object rows.");
+assert.equal(preview.objectCount, 897, "Expected 897 preview objects.");
 assert.equal(nonEmptyPassthroughRows, 211, "Expected 211 non-empty passthrough rows.");
 assert.equal(counts["suspect-object"], 0, "Expected no suspect object rows.");
 assert.equal(
@@ -66,6 +73,7 @@ process.stdout.write(
       rows: counts,
       nonEmptyPassthroughRows,
       roundTripByteIdentical: true,
+      previewObjectCount: preview.objectCount,
     },
     null,
     2
diff --git a/src/db/repositories/external-csv-configuration.repository.ts b/src/db/repositories/external-csv-configuration.repository.ts
new file mode 100644
index 0000000..2b39a65
--- /dev/null
+++ b/src/db/repositories/external-csv-configuration.repository.ts
@@ -0,0 +1,28 @@
+import { eq } from "drizzle-orm";
+import type { ExternalCsvConfigurationReader } from "../../domain/ports/external-csv-configuration.reader.js";
+import type { AppDatabase } from "../database-context.js";
+import { externalCsvConfigurations } from "../schema/external-csv-configurations.js";
+import { projects } from "../schema/projects.js";
+
+export class ExternalCsvConfigurationRepository
+  implements ExternalCsvConfigurationReader
+{
+  constructor(private readonly database: AppDatabase) {}
+
+  getByProject(projectId: string) {
+    const project = this.database
+      .select({ id: projects.id })
+      .from(projects)
+      .where(eq(projects.id, projectId))
+      .get();
+    if (!project) {
+      return { projectExists: false, configuration: null };
+    }
+    const configuration = this.database
+      .select()
+      .from(externalCsvConfigurations)
+      .where(eq(externalCsvConfigurations.projectId, projectId))
+      .get() ?? null;
+    return { projectExists: true, configuration };
+  }
+}
diff --git a/src/domain/ports/external-csv-configuration.reader.ts b/src/domain/ports/external-csv-configuration.reader.ts
new file mode 100644
index 0000000..a50144b
--- /dev/null
+++ b/src/domain/ports/external-csv-configuration.reader.ts
@@ -0,0 +1,10 @@
+import type { ExternalCsvConfigurationSnapshot } from "../models/external-csv-configuration-project-command.model.js";
+
+export interface ExternalCsvConfigurationReadResult {
+  projectExists: boolean;
+  configuration: ExternalCsvConfigurationSnapshot | null;
+}
+
+export interface ExternalCsvConfigurationReader {
+  getByProject(projectId: string): ExternalCsvConfigurationReadResult;
+}
diff --git a/src/external-model/application/external-csv-preview.ts b/src/external-model/application/external-csv-preview.ts
new file mode 100644
index 0000000..57aa480
--- /dev/null
+++ b/src/external-model/application/external-csv-preview.ts
@@ -0,0 +1,91 @@
+import { createHash } from "node:crypto";
+import type { ExternalCsvConfiguration } from "../csv/external-csv-contracts.js";
+import { parseExternalCsv } from "../csv/external-csv-transport.js";
+
+export interface ExternalCsvPreviewObject {
+  rowNumber: number;
+  ifcGuid: string;
+  roomNumber: string;
+  roomName: string;
+  familyAndType: string;
+  selectionMarker: string;
+  circuitIdentifier: string;
+  power: string;
+  quantity: string | null;
+  additionalSourceValues: Record<string, string>;
+}
+
+export interface ExternalCsvPreview {
+  fileName: string;
+  byteLength: number;
+  sha256: string;
+  dialect: ReturnType<typeof parseExternalCsv>["dialect"];
+  headerRowNumber: number;
+  headerColumns: string[];
+  rowCount: number;
+  objectCount: number;
+  passthroughCount: number;
+  nonEmptyPassthroughCount: number;
+  suspectObjectCount: number;
+  objects: ExternalCsvPreviewObject[];
+  suspectRowNumbers: number[];
+}
+
+export function createExternalCsvPreview(input: {
+  fileName: string;
+  bytes: Uint8Array;
+  configuration: ExternalCsvConfiguration;
+}): ExternalCsvPreview {
+  const document = parseExternalCsv(input.bytes, input.configuration);
+  const header = document.rows[document.headerRowIndex];
+  const headerIndex = new Map(
+    header.cells.map((cell, index) => [cell.value, index])
+  );
+  const valueAt = (row: (typeof document.rows)[number], column: string) =>
+    row.cells[headerIndex.get(column)!]?.value ?? "";
+  const objects = document.rows
+    .filter((row) => row.classification === "object")
+    .map((row): ExternalCsvPreviewObject => ({
+      rowNumber: row.index + 1,
+      ifcGuid: valueAt(row, input.configuration.columns.ifcGuid),
+      roomNumber: valueAt(row, input.configuration.columns.roomNumber),
+      roomName: valueAt(row, input.configuration.columns.roomName),
+      familyAndType: valueAt(row, input.configuration.columns.familyAndType),
+      selectionMarker: valueAt(row, input.configuration.columns.selectionMarker),
+      circuitIdentifier: valueAt(row, input.configuration.columns.circuitIdentifier),
+      power: valueAt(row, input.configuration.columns.power),
+      quantity:
+        input.configuration.columns.quantity === null
+          ? null
+          : valueAt(row, input.configuration.columns.quantity),
+      additionalSourceValues: Object.fromEntries(
+        input.configuration.additionalSourceMappings.map((mapping) => [
+          mapping.targetField,
+          valueAt(row, mapping.sourceColumn),
+        ])
+      ),
+    }));
+  const passthroughRows = document.rows.filter(
+    (row) => row.classification === "passthrough"
+  );
+  const suspectRows = document.rows.filter(
+    (row) => row.classification === "suspect-object"
+  );
+  return {
+    fileName: input.fileName,
+    byteLength: input.bytes.byteLength,
+    sha256: createHash("sha256").update(input.bytes).digest("hex"),
+    dialect: document.dialect,
+    headerRowNumber: document.headerRowIndex + 1,
+    headerColumns: header.cells.map((cell) => cell.value),
+    rowCount: document.rows.length,
+    objectCount: objects.length,
+    passthroughCount: passthroughRows.length,
+    nonEmptyPassthroughCount: passthroughRows.filter((row) =>
+      row.cells.some((cell) => cell.value !== "")
+    ).length,
+    suspectObjectCount: suspectRows.length,
+    objects,
+    suspectRowNumbers: suspectRows.map((row) => row.index + 1),
+  };
+}
diff --git a/src/server/composition/application-repositories.ts b/src/server/composition/application-repositories.ts
index a880b41..ebeaf5f 100644
--- a/src/server/composition/application-repositories.ts
+++ b/src/server/composition/application-repositories.ts
@@ -11,6 +11,7 @@ import { GlobalDeviceRepository } from "../../db/repositories/global-device.repo
 import { ProjectDeviceRepository } from "../../db/repositories/project-device.repository.js";
 import { ProjectRepository } from "../../db/repositories/project.repository.js";
 import { RoomRepository } from "../../db/repositories/room.repository.js";
+import { ExternalCsvConfigurationRepository } from "../../db/repositories/external-csv-configuration.repository.js";
 
 export const circuitDeviceRowRepository =
   new CircuitDeviceRowRepository(db);
@@ -28,3 +29,5 @@ export const globalDeviceRepository = new GlobalDeviceRepository(db);
 export const projectDeviceRepository = new ProjectDeviceRepository(db);
 export const projectRepository = new ProjectRepository(db);
 export const roomRepository = new RoomRepository(db);
+export const externalCsvConfigurationRepository =
+  new ExternalCsvConfigurationRepository(db);
diff --git a/src/server/controllers/external-csv.controller.ts b/src/server/controllers/external-csv.controller.ts
new file mode 100644
index 0000000..592bcd0
--- /dev/null
+++ b/src/server/controllers/external-csv.controller.ts
@@ -0,0 +1,117 @@
+import crypto from "node:crypto";
+import type { Request, Response } from "express";
+import { assertExternalCsvConfiguration } from "../../external-model/csv/external-csv-configuration.js";
+import { ExternalCsvParseError } from "../../external-model/csv/external-csv-transport.js";
+import { createExternalCsvPreview } from "../../external-model/application/external-csv-preview.js";
+import { createExternalCsvConfigurationUpdateProjectCommand } from "../../domain/models/external-csv-configuration-project-command.model.js";
+import {
+  previewExternalCsvSchema,
+  updateExternalCsvConfigurationSchema,
+} from "../../shared/validation/external-csv.schemas.js";
+import { externalCsvConfigurationRepository } from "../composition/application-repositories.js";
+import { projectCommandService } from "../composition/project-command-stores.js";
+import { respondWithProjectCommandError } from "./project-command.controller.js";
+
+export function getExternalCsvConfiguration(req: Request, res: Response) {
+  const projectId = getProjectId(req, res);
+  if (!projectId) return;
+  const result = externalCsvConfigurationRepository.getByProject(projectId);
+  if (!result.projectExists) {
+    return res.status(404).json({ error: "Project not found" });
+  }
+  return res.json({ configuration: result.configuration });
+}
+
+export function updateExternalCsvConfiguration(req: Request, res: Response) {
+  const projectId = getProjectId(req, res);
+  if (!projectId) return;
+  const parsed = updateExternalCsvConfigurationSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+  try {
+    assertExternalCsvConfiguration(parsed.data.configuration);
+    const current = externalCsvConfigurationRepository.getByProject(projectId);
+    if (!current.projectExists) {
+      return res.status(404).json({ error: "Project not found" });
+    }
+    const target = {
+      id: current.configuration?.id ?? crypto.randomUUID(),
+      projectId,
+      configurationVersion:
+        (current.configuration?.configurationVersion ?? 0) + 1,
+      configuration: parsed.data.configuration,
+    };
+    const result = projectCommandService.executeUser({
+      projectId,
+      expectedRevision: parsed.data.expectedRevision,
+      description: "Revit-CSV-Konfiguration bearbeiten",
+      command: createExternalCsvConfigurationUpdateProjectCommand(
+        current.configuration,
+        target
+      ),
+    });
+    return res.json({ ...result, configuration: target });
+  } catch (error) {
+    return respondWithProjectCommandError(error, res);
+  }
+}
+
+export function previewExternalCsv(req: Request, res: Response) {
+  const projectId = getProjectId(req, res);
+  if (!projectId) return;
+  const parsed = previewExternalCsvSchema.safeParse(req.body);
+  if (!parsed.success) {
+    return res.status(400).json({ error: parsed.error.flatten() });
+  }
+  const stored = externalCsvConfigurationRepository.getByProject(projectId);
+  if (!stored.projectExists) {
+    return res.status(404).json({ error: "Project not found" });
+  }
+  if (!stored.configuration) {
+    return res.status(409).json({
+      error: "Für das Projekt ist noch keine Revit-CSV-Konfiguration gespeichert.",
+      code: "EXTERNAL_CSV_CONFIGURATION_REQUIRED",
+    });
+  }
+  try {
+    const bytes = decodeBase64(parsed.data.contentBase64);
+    return res.json(
+      createExternalCsvPreview({
+        fileName: parsed.data.fileName,
+        bytes,
+        configuration: stored.configuration.configuration,
+      })
+    );
+  } catch (error) {
+    if (error instanceof ExternalCsvParseError) {
+      return res.status(400).json({ error: error.message, code: error.code });
+    }
+    return res.status(400).json({
+      error: error instanceof Error ? error.message : "CSV-Vorschau fehlgeschlagen.",
+    });
+  }
+}
+
+function decodeBase64(value: string) {
+  if (!/^[A-Za-z0-9+/]+={0,2}$/.test(value) || value.length % 4 !== 0) {
+    throw new Error("CSV-Inhalt ist nicht gültig Base64-kodiert.");
+  }
+  const bytes = Buffer.from(value, "base64");
+  if (bytes.toString("base64") !== value) {
+    throw new Error("CSV-Inhalt ist nicht kanonisch Base64-kodiert.");
+  }
+  if (bytes.length > 18 * 1024 * 1024) {
+    throw new Error("CSV-Datei überschreitet die maximale Größe von 18 MB.");
+  }
+  return bytes;
+}
+
+function getProjectId(req: Request, res: Response) {
+  const { projectId } = req.params;
+  if (typeof projectId !== "string" || !projectId.trim()) {
+    res.status(400).json({ error: "Invalid projectId" });
+    return null;
+  }
+  return projectId;
+}
diff --git a/src/server/routes/project.routes.ts b/src/server/routes/project.routes.ts
index b0bd39f..89909d0 100644
--- a/src/server/routes/project.routes.ts
+++ b/src/server/routes/project.routes.ts
@@ -35,6 +35,11 @@ import {
   importProjectTransfer,
   importProjectTransferAsNewProject,
 } from "../controllers/project-transfer.controller.js";
+import {
+  getExternalCsvConfiguration,
+  previewExternalCsv,
+  updateExternalCsvConfiguration,
+} from "../controllers/external-csv.controller.js";
 
 export const projectRouter = Router();
 
@@ -44,6 +49,9 @@ projectRouter.post("/import", importProjectTransferAsNewProject);
 projectRouter.get("/:projectId", getProject);
 projectRouter.get("/:projectId/export", exportProjectTransfer);
 projectRouter.post("/:projectId/import", importProjectTransfer);
+projectRouter.get("/:projectId/external-csv/configuration", getExternalCsvConfiguration);
+projectRouter.put("/:projectId/external-csv/configuration", updateExternalCsvConfiguration);
+projectRouter.post("/:projectId/external-csv/preview", previewExternalCsv);
 projectRouter.get("/:projectId/history", getProjectHistory);
 projectRouter.get("/:projectId/history/revisions", listProjectRevisions);
 projectRouter.post("/:projectId/commands", executeProjectCommand);
diff --git a/src/shared/validation/external-csv.schemas.ts b/src/shared/validation/external-csv.schemas.ts
new file mode 100644
index 0000000..5650b09
--- /dev/null
+++ b/src/shared/validation/external-csv.schemas.ts
@@ -0,0 +1,15 @@
+import { z } from "zod";
+
+export const updateExternalCsvConfigurationSchema = z
+  .object({
+    expectedRevision: z.number().int().nonnegative(),
+    configuration: z.unknown(),
+  })
+  .strict();
+
+export const previewExternalCsvSchema = z
+  .object({
+    fileName: z.string().trim().min(1).max(255),
+    contentBase64: z.string().min(1).max(24_000_000),
+  })
+  .strict();
diff --git a/tests/external-csv-api-contract.test.ts b/tests/external-csv-api-contract.test.ts
new file mode 100644
index 0000000..261f962
--- /dev/null
+++ b/tests/external-csv-api-contract.test.ts
@@ -0,0 +1,52 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+  previewExternalCsvSchema,
+  updateExternalCsvConfigurationSchema,
+} from "../src/shared/validation/external-csv.schemas.js";
+import { createDefaultExternalCsvConfiguration } from "../src/external-model/csv/external-csv-contracts.js";
+import { externalCsvTestColumns } from "./fixtures/revit-csv-fixtures.js";
+
+describe("external CSV API contracts", () => {
+  it("accepts strict update and preview request envelopes", () => {
+    assert.equal(
+      updateExternalCsvConfigurationSchema.safeParse({
+        expectedRevision: 4,
+        configuration: createDefaultExternalCsvConfiguration(externalCsvTestColumns),
+      }).success,
+      true
+    );
+    assert.equal(
+      previewExternalCsvSchema.safeParse({
+        fileName: "revit.csv",
+        contentBase64: "YWJj",
+      }).success,
+      true
+    );
+  });
+
+  it("rejects stale-shaped, oversized and unknown request fields", () => {
+    assert.equal(
+      updateExternalCsvConfigurationSchema.safeParse({
+        expectedRevision: -1,
+        configuration: {},
+      }).success,
+      false
+    );
+    assert.equal(
+      previewExternalCsvSchema.safeParse({
+        fileName: "revit.csv",
+        contentBase64: "YWJj",
+        apply: true,
+      }).success,
+      false
+    );
+    assert.equal(
+      previewExternalCsvSchema.safeParse({
+        fileName: "revit.csv",
+        contentBase64: "a".repeat(24_000_001),
+      }).success,
+      false
+    );
+  });
+});
diff --git a/tests/external-csv-configuration-project-command.repository.test.ts b/tests/external-csv-configuration-project-command.repository.test.ts
index c3e9c97..0186581 100644
--- a/tests/external-csv-configuration-project-command.repository.test.ts
+++ b/tests/external-csv-configuration-project-command.repository.test.ts
@@ -8,6 +8,7 @@ import {
   type DatabaseContext,
 } from "../src/db/database-context.js";
 import { ExternalCsvConfigurationProjectCommandRepository } from "../src/db/repositories/external-csv-configuration-project-command.repository.js";
+import { ExternalCsvConfigurationRepository } from "../src/db/repositories/external-csv-configuration.repository.js";
 import { ProjectTransferRepository } from "../src/db/repositories/project-transfer.repository.js";
 import { ProjectStateRestoreCommandRepository } from "../src/db/repositories/project-state-restore-command.repository.js";
 import { readProjectStateSnapshot } from "../src/db/repositories/project-state-snapshot.persistence.js";
@@ -169,6 +170,23 @@ describe("external CSV configuration project command", () => {
     }
   });
 
+  it("distinguishes projects without configuration from unknown projects", () => {
+    const context = createTestDatabase();
+    try {
+      const reader = new ExternalCsvConfigurationRepository(context.db);
+      assert.deepEqual(reader.getByProject("project-1"), {
+        projectExists: true,
+        configuration: null,
+      });
+      assert.deepEqual(reader.getByProject("missing"), {
+        projectExists: false,
+        configuration: null,
+      });
+    } finally {
+      context.close();
+    }
+  });
+
   it("restores and undoes the complete configuration through snapshot history", () => {
     const context = createTestDatabase();
     try {
diff --git a/tests/external-csv-preview.test.ts b/tests/external-csv-preview.test.ts
new file mode 100644
index 0000000..b786ebd
--- /dev/null
+++ b/tests/external-csv-preview.test.ts
@@ -0,0 +1,56 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { createExternalCsvPreview } from "../src/external-model/application/external-csv-preview.js";
+import {
+  externalCsvTestConfiguration,
+  firstIfcGuid,
+  quotedRevitCsv,
+  utf8Bytes,
+} from "./fixtures/revit-csv-fixtures.js";
+
+describe("external CSV preview", () => {
+  it("projects transport statistics and mapped object source values without writes", () => {
+    const configuration = structuredClone(externalCsvTestConfiguration);
+    configuration.additionalSourceMappings.push({
+      sourceColumn: "Raumname",
+      targetField: "sourceRoomLabel",
+    });
+    // The additional mapping intentionally needs a distinct source column in
+    // persisted configuration, so use a separately named synthetic header.
+    configuration.additionalSourceMappings[0].sourceColumn = "Zusatzwert";
+    const csv = quotedRevitCsv
+      .replace('"Anzahl";"IfcGUID"', '"Anzahl";"Zusatzwert";"IfcGUID"')
+      .replaceAll(';"2";"0Ab', ';"2";"A";"0Ab')
+      .replaceAll(';"1";"1Ab', ';"1";"B";"1Ab')
+      .replaceAll(';"1";""', ';"1";"C";""')
+      .replaceAll(';"";""\r\n', ';"";"";""\r\n');
+
+    const preview = createExternalCsvPreview({
+      fileName: "export.csv",
+      bytes: utf8Bytes(csv, true),
+      configuration,
+    });
+
+    assert.equal(preview.fileName, "export.csv");
+    assert.equal(preview.headerRowNumber, 2);
+    assert.equal(preview.rowCount, 7);
+    assert.equal(preview.objectCount, 2);
+    assert.equal(preview.passthroughCount, 2);
+    assert.equal(preview.nonEmptyPassthroughCount, 1);
+    assert.equal(preview.suspectObjectCount, 1);
+    assert.deepEqual(preview.suspectRowNumbers, [6]);
+    assert.match(preview.sha256, /^[a-f0-9]{64}$/);
+    assert.deepEqual(preview.objects[0], {
+      rowNumber: 4,
+      ifcGuid: firstIfcGuid,
+      roomNumber: "01/101",
+      roomName: "Technik",
+      familyAndType: "Steckdose: Doppelsteckdose",
+      selectionMarker: "Arbeitsplatz",
+      circuitIdentifier: "UV_AV_01-2F1",
+      power: "120,5",
+      quantity: "2",
+      additionalSourceValues: { sourceRoomLabel: "A" },
+    });
+  });
+});