Add printing tests

@@ -76,6 +76,7 @@ test-pdf: $(FONTS) get-pdf .coverage
 	test/compare-pdf.sh pdf test/golden
 
 test-printing: $(FONTS) get-printing .coverage
+	cd printing; flutter test --coverage --coverage-path lcov.info
 	cd printing/example; flutter test --coverage --coverage-path ../lcov.info
 
 test-readme: $(FONTS) get-readme

+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:flutter/services.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pdf/pdf.dart';
+import 'package:pdf/widgets.dart' as pdf;
+import 'package:printing/printing.dart';
+
+pdf.Document doc;
+pdf.Font ttf;
+
+void main() {
+  final String path =
+      Directory.current.path.split('/').last == 'test' ? '..' : '.';
+  const MethodChannel channel = MethodChannel('net.nfet.printing');
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  setUp(() {
+    channel.setMockMethodCallHandler((MethodCall methodCall) async {
+      print(methodCall);
+      return '1';
+    });
+  });
+
+  tearDown(() {
+    channel.setMockMethodCallHandler(null);
+  });
+
+  test('convertHtml', () async {
+    // expect(await Printing.platformVersion, '42');
+  });
+
+  test('pdfImageFromImageProvider(FileImage)', () async {
+    final PdfImage image = await pdfImageFromImageProvider(
+        pdf: doc.document, image: FileImage(File('$path/example.png')));
+
+    doc.addPage(
+      pdf.Page(
+        build: (pdf.Context context) => pdf.Center(
+          child: pdf.Container(
+            child: pdf.Image(image),
+          ),
+        ),
+      ),
+    );
+  });
+
+  setUpAll(() {
+    pdf.Document.debug = true;
+    pdf.RichText.debug = true;
+    final Uint8List fontData =
+        File('$path/../pdf/open-sans.ttf').readAsBytesSync();
+    ttf = pdf.Font.ttf(fontData.buffer.asByteData());
+    doc = pdf.Document();
+  });
+
+  tearDownAll(() {
+    final File file = File('printing.pdf');
+    file.writeAsBytesSync(doc.save());
+  });
+}