test(geobase): byte reader and writer tests #115

dart/geobase/test/utils/byte_writer_reader_test.dart

@@ -0,0 +1,82 @@
+// Copyright (c) 2020-2022 Navibyte (https://navibyte.com). All rights reserved.
+// Use of this source code is governed by a “BSD-3-Clause”-style license that is
+// specified in the LICENSE file.
+//
+// Docs: https://github.com/navibyte/geospatial
+
+import 'dart:typed_data';
+
+import 'package:geobase/src/utils/byte_reader.dart';
+import 'package:geobase/src/utils/byte_writer.dart';
+
+import 'package:test/test.dart';
+
+void main() {
+  group('Byte writer and reader', () {
+    final endians = [Endian.big, Endian.little];
+    final bufferSizes = [4, 128, 2048];
+    final sampleInts = [0, 1, -2, 97, -83];
+    final sampleDoubles = [0.0, 1.238577237, -423.2, 97e12, -83899.22323];
+
+    for (final endian in endians) {
+      for (final bufferSize in bufferSizes) {
+        test('Write and read bytes', () {
+          // write bytes using ByteWriter
+          final writer =
+              ByteWriter.buffered(endian: endian, bufferSize: bufferSize);
+          for (final sample in sampleInts) {
+            writer
+              ..writeInt8(sample)
+              ..writeInt16(sample)
+              ..writeInt16(sample * 234)
+              ..writeInt32(sample)
+              ..writeInt32(sample * 63423)
+              ..writeInt64(sample)
+              ..writeInt64(sample * 1283455)
+              ..writeUint8(sample.abs())
+              ..writeUint16(sample.abs())
+              ..writeUint16((sample * 62).abs())
+              ..writeUint32(sample.abs())
+              ..writeUint32((sample * 61983).abs())
+              ..writeUint64(sample.abs())
+              ..writeUint64((sample * 8473443).abs());
+          }
+          for (final sample in sampleDoubles) {
+            writer
+              ..writeFloat32(sample)
+              ..writeFloat64(sample);
+          }
+
+          // get bytes as Uint8List
+          final bytes = writer.toBytes();
+
+          // read bytes using ByteReader
+          final reader = ByteReader.view(bytes.buffer, endian: endian);
+          for (final sample in sampleInts) {
+            expect(reader.readInt8(), sample);
+            expect(reader.readInt16(), sample);
+            expect(reader.readInt16(), sample * 234);
+            expect(reader.readInt32(), sample);
+            expect(reader.readInt32(), sample * 63423);
+            expect(reader.readInt64(), sample);
+            expect(reader.readInt64(), sample * 1283455);
+            expect(reader.readUint8(), sample.abs());
+            expect(reader.readUint16(), sample.abs());
+            expect(reader.readUint16(), (sample * 62).abs());
+            expect(reader.readUint32(), sample.abs());
+            expect(reader.readUint32(), (sample * 61983).abs());
+            expect(reader.readUint64(), sample.abs());
+            expect(reader.readUint64(), (sample * 8473443).abs());
+          }
+          for (final sample in sampleDoubles) {
+            expect(
+              reader.readFloat32(),
+              closeTo(sample, (sample / 10e6).abs()),
+            );
+            expect(reader.readFloat64(), sample);
+          }
+        });
+      }
+    }
+  });
+}