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diff --git a/MapTests/MapDocumentTests.swift b/MapTests/MapDocumentTests.swift
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+++ b/MapTests/MapDocumentTests.swift
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+// Copyright (C) 2024 Rubén Beltrán del Río
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+import SwiftUI
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see https://map.tranquil.systems.
+import Testing
+import UniformTypeIdentifiers
+
+@testable import Map
+
+struct MapDocumentTests {
+
+  @Test func testMapDocumentInitialization() async throws {
+    let document = MapDocument()
+    #expect(
+      document.text == """
+        Anchor (60, 5) [x]
+        Node A (78, 23)
+        Node B (40, 30) [square]
+        Node C (65, 70)
+
+        Anchor -> Node A
+        Anchor -> Node B
+        Node A -> Node C
+        Node B -> Node C
+        """)
+  }
+
+  @Test func testMapDocumentInitializationWithText() async throws {
+    let testText = "Test map content"
+    let document = MapDocument(text: testText)
+    #expect(document.text == testText)
+  }
+
+  @Test func testMapDocumentReadableContentTypes() async throws {
+    let contentTypes = MapDocument.readableContentTypes
+    #expect(contentTypes.count == 1)
+    #expect(contentTypes.first == UTType.wmap)
+  }
+
+  @Test func testMapDocumentTextProperty() async throws {
+    let document = MapDocument(text: "Test content")
+    #expect(document.text == "Test content")
+
+    // Test that the document can handle different text content
+    let mapContent = "Node A (10, 20)\nNode B (30, 40)\nNode A -> Node B"
+    let mapDocument = MapDocument(text: mapContent)
+    #expect(mapDocument.text == mapContent)
+  }
+
+  @Test func testMapDocumentWithEmptyContent() async throws {
+    let document = MapDocument(text: "")
+    #expect(document.text == "")
+  }
+
+  @Test func testMapDocumentExportAsImage() async throws {
+    let document = MapDocument(text: "Node A (10, 20)\nNode B (30, 40)")
+
+    await MainActor.run {
+      let image = document.exportAsImage(withEvolution: .general)
+      #expect(image != nil)
+      #expect(image!.size.width > 0)
+      #expect(image!.size.height > 0)
+    }
+  }
+
+  @Test func testUTTypeExampleText() async throws {
+    let utType = UTType.wmap
+    #expect(utType.identifier == "systems.tranquil.map.wmap")
+  }
+}