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build/node_modules/exif-parser/test/test-jpeg.js

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+var testCase = require('nodeunit').testCase;
+var jpeg = require('../lib/jpeg.js');
+var BufferStream = require('../lib/bufferstream.js');
+var buf = require('fs').readFileSync(__dirname + '/test.jpg');
+
+module.exports = testCase({
+	"test parseSections": function(test) {
+		var expectedSections = [
+			{ type: 216, offset: 2, len: 0 },
+			{ type: 224, offset: 6, len: 14 },
+			{ type: 226, offset: 24, len: 3158 },
+			{ type: 225, offset: 3186, len: 200 },
+			{ type: 225, offset: 3390, len: 374 },
+			{ type: 219, offset: 3768, len: 65 },
+			{ type: 219, offset: 3837, len: 65 },
+			{ type: 192, offset: 3906, len: 15 },
+			{ type: 196, offset: 3925, len: 29 },
+			{ type: 196, offset: 3958, len: 179 },
+			{ type: 196, offset: 4141, len: 29 },
+			{ type: 196, offset: 4174, len: 179 },
+			{ type: 218, offset: 4355, len: 0 }
+		];
+		var index = 0;
+		var jpegStream = new BufferStream(buf), start = jpegStream.mark();
+		jpeg.parseSections(jpegStream, function(type, sectionStream) {
+			test.strictEqual(type, expectedSections[index].type);
+			test.strictEqual(sectionStream.offsetFrom(start), expectedSections[index].offset);
+			test.strictEqual(sectionStream.remainingLength(), expectedSections[index].len);
+			++index;
+		});
+		test.strictEqual(index, expectedSections.length, 'all sections should be passed to the iterator');
+		test.done();	
+	},
+	"test getSizeFromSOFSection": function(test) {
+		var size = jpeg.getSizeFromSOFSection(new BufferStream(buf, 3906, 15, true));
+		test.strictEqual(size.width, 2);
+		test.strictEqual(size.height, 1);
+		test.done();
+	},
+	"test getSectionName": function(test) {
+		test.deepEqual({name: 'SOI'}, jpeg.getSectionName(0xD8));
+		test.deepEqual({name: 'APP', index: 15}, jpeg.getSectionName(0xEF));
+		test.deepEqual({name: 'DHT'}, jpeg.getSectionName(0xC4));
+		test.done();
+	}
+});