Handling Exceptions in JUnit Testing with JSON and Isomorphism Techniques
Learn how to handle exceptions effectively in JUnit testing by exploring examples involving JSON manipulation and Isomorphism techniques. Enhance your understanding of error handling strategies in software development with detailed code snippets and explanations.
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Junit Test Example package stanford.cs190.tweeter; import org.junit.Test; public class JsonTest extends junit.framework.TestCase { @Test public void test_array() { Json document = new Json(); document.startArray(); document.addValue(12345); document.addValue(999); document.endArray(); assertEquals("[12345, 999]", document.toString()); } ... Do something } Check result CS 190 Lecture Notes: Exception Handling Slide 1
Test Isomorphism protected void readRequest(Reader reader) { try { BufferedReader in = new BufferedReader(reader); // Read the first line of input // (method, url, protocol version). String firstLine = in.readLine(); if (firstLine == null) { throw new RequestError("empty HTTP request"); } String[] words = firstLine.split(" +", 4); if (words.length < 3) { throw new RequestError("syntax error in " + first line: '%s'", firstLine); } method = words[0]; rawUrl = words[1]; protocolVersion = words[2]; // Read the headers. Each iteration through the // following loop reads one line, which contains a // single header. while (true) { String headerLine = in.readLine(); if (headerLine == null) { throw new RequestError( "unexpected EOF while reading " + "headers"); } if (headerLine.length() == 0) { // Empty line marks the end of headers. break; } int i = headerLine.indexOf(": "); if (i == -1) { throw new RequestError("syntax error in " + "header line: '%s'", headerLine); } headers.put(headerLine.substring(0, i), headerLine.substring(i+2)); } ... @Test public void test_readRequest_basics() { ... } @Test public void test_readRequest_emptyInput() { ... } @Test public void test_readRequest_incompleteFirstLine() { ... } @Test public void test_readRequest_EofInHeaders() { ... } @Test public void test_readRequest_headerHasNoColon() { ... } CS 190 Lecture Notes: Exception Handling Slide 2
Helper Methods /** * Create a bunch of new tweets in the current repo. * @param count * Number of tweets to create. */ protected void createTweets(int count) { ... } /** * Returns a string containing a sorted list of the * tweet ids for each of the TweetFiles in the * in-memory cache. */ protected String getCachedIds() { ... } CS 190 Lecture Notes: Exception Handling Slide 3
Helper Methods, contd @Test public void test_checkCacheSize_belowLimit() { createTweets(17); repo.cacheLimit = 3; repo.checkCacheSize(); assertEquals("10 20", getCachedIds()); } CS 190 Lecture Notes: Exception Handling Slide 4
