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

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+var testCase = require('nodeunit').testCase;
+var exif = require('../lib/exif.js');
+var BufferStream = require('../lib/bufferstream.js');
+var buf = require('fs').readFileSync(__dirname + '/starfish.jpg');
+
+module.exports = testCase({
+	"test parseTags": function(test) {
+		var expectedTags = require('./expected-exif-tags.json');
+		var index = 0;
+		exif.parseTags(new BufferStream(buf, 24, 23960), function(ifdSection, tagType, value, format) {
+			var t = expectedTags[index];
+			test.strictEqual(t.ifdSection, ifdSection);
+			test.strictEqual(t.tagType, tagType);
+			test.strictEqual(t.format, format);
+			if(typeof t.value === 'string' && t.value.indexOf('b:') === 0) {
+				test.ok(Buffer.isBuffer(value));
+				test.strictEqual(parseInt(t.value.substr(2), 10), value.length);
+			} else {
+				test.deepEqual(t.value, value);
+			}
+			++index;
+		});
+		test.strictEqual(index, expectedTags.length, 'all tags should be passed to the iterator');
+		test.done();	
+	}
+});