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206 lines (182 loc) · 5.54 KB
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import org.junit.Assert;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
public class BracketsTest extends Assert {
@Test
public void test1() {
Brackets brackets = new Brackets(1);
List<String> results = brackets.gen();
assertEquals(1, results.size());
assertEquals("()", results.get(0));
}
@Test
public void test2() {
Brackets brackets = new Brackets(2);
ArrayList<String> results = brackets.gen();
assertEquals(2, results.size());
assertEquals("(())", results.get(0));
assertEquals("()()", results.get(1));
}
@Test
public void test3() {
Brackets brackets = new Brackets(3);
ArrayList<String> results = brackets.gen();
assertEquals(5, results.size());
assertEquals("((()))", results.get(0));
assertEquals("(()())", results.get(1));
assertEquals("(())()", results.get(2));
assertEquals("()(())", results.get(3));
assertEquals("()()()", results.get(4));
}
@Test
public void test4() {
Brackets brackets = new Brackets(4);
for (String res : brackets.gen())
System.out.println(res);
}
// Additional edge case tests for 100% coverage
/**
* Test with N = 0 (no brackets)
*/
@Test
public void test0() {
Brackets brackets = new Brackets(0);
ArrayList<String> results = brackets.gen();
assertEquals(1, results.size());
assertEquals("", results.get(0));
}
/**
* Test with N = 5
*/
@Test
public void test5() {
Brackets brackets = new Brackets(5);
ArrayList<String> results = brackets.gen();
// Catalan number C(5) = 42
assertEquals(42, results.size());
}
/**
* Test with N = 6
*/
@Test
public void test6() {
Brackets brackets = new Brackets(6);
ArrayList<String> results = brackets.gen();
// Catalan number C(6) = 132
assertEquals(132, results.size());
}
/**
* Test that all generated sequences are valid
*/
@Test
public void testAllSequencesValid() {
Brackets brackets = new Brackets(3);
ArrayList<String> results = brackets.gen();
for (String seq : results) {
assertTrue("Sequence should be valid: " + seq, isValidBracketSequence(seq));
}
}
/**
* Test that all sequences have correct length
*/
@Test
public void testSequenceLengths() {
int n = 4;
Brackets brackets = new Brackets(n);
ArrayList<String> results = brackets.gen();
for (String seq : results) {
assertEquals("Sequence should have length 2*N", 2 * n, seq.length());
}
}
/**
* Test that sequences are unique
*/
@Test
public void testSequencesUnique() {
Brackets brackets = new Brackets(4);
ArrayList<String> results = brackets.gen();
java.util.Set<String> uniqueResults = new java.util.HashSet<>(results);
assertEquals("All sequences should be unique", results.size(), uniqueResults.size());
}
/**
* Test that first sequence is most nested
*/
@Test
public void testFirstSequenceMostNested() {
Brackets brackets = new Brackets(4);
ArrayList<String> results = brackets.gen();
assertEquals("(((())))", results.get(0));
}
/**
* Test that last sequence is least nested
*/
@Test
public void testLastSequenceLeastNested() {
Brackets brackets = new Brackets(4);
ArrayList<String> results = brackets.gen();
assertEquals("()()()()", results.get(results.size() - 1));
}
/**
* Test with large N value
*/
@Test
public void test7() {
Brackets brackets = new Brackets(7);
ArrayList<String> results = brackets.gen();
// Catalan number C(7) = 429
assertEquals(429, results.size());
}
/**
* Test constructor stores N correctly
*/
@Test
public void testConstructorStoresN() {
Brackets brackets = new Brackets(5);
// gen() should produce sequences of length 2*5 = 10
ArrayList<String> results = brackets.gen();
for (String seq : results) {
assertEquals(10, seq.length());
}
}
/**
* Test multiple calls to gen() return consistent results
*/
@Test
public void testMultipleGenCalls() {
Brackets brackets = new Brackets(3);
ArrayList<String> results1 = brackets.gen();
ArrayList<String> results2 = brackets.gen();
assertEquals(results1.size(), results2.size());
for (int i = 0; i < results1.size(); i++) {
assertEquals(results1.get(i), results2.get(i));
}
}
/**
* Test sequences contain only parentheses
*/
@Test
public void testSequencesContainOnlyParentheses() {
Brackets brackets = new Brackets(4);
ArrayList<String> results = brackets.gen();
for (String seq : results) {
assertTrue("Sequence should only contain ( and )",
seq.matches("[()]*"));
}
}
// Helper method to validate bracket sequences
private boolean isValidBracketSequence(String seq) {
int balance = 0;
for (char c : seq.toCharArray()) {
if (c == '(') {
balance++;
} else if (c == ')') {
balance--;
}
if (balance < 0) {
return false;
}
}
return balance == 0;
}
}