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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.yolean.trace;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
/**
* @author bratseth
*/
public class TraceNodeTestCase {
@Test
public void requireThatAccessorsWork() {
TraceNode node = new TraceNode(null, 6);
assertNull(node.payload());
assertEquals(6, node.timestamp());
assertFalse(node.children().iterator().hasNext());
assertFalse(node.descendants(Object.class).iterator().hasNext());
assertTrue(node.isRoot());
assertNull(node.parent());
assertSame(node, node.root());
}
@Test
public void requireThatToStringIsReadable() {
TraceNode trace = new TraceNode(null, 0)
.add(new TraceNode("a", 1))
.add(new TraceNode("b", 2)
.add(new TraceNode("c", 3)));
assertEquals("[ [ a b [ c ] ] ]", trace.toString());
}
@Test
public void requireThatPayloadMayBeNull() {
TraceNode node = new TraceNode(null, 6);
assertNull(node.payload());
}
@Test
public void requireThatRootNodesCanBeAdded() {
TraceNode parent = new TraceNode(null, 1);
TraceNode foo = new TraceNode(null, 2);
parent.add(foo);
assertSame(parent, foo.parent());
TraceNode bar = new TraceNode(null, 3);
parent.add(bar);
assertSame(parent, bar.parent());
Iterator<TraceNode> children = parent.children().iterator();
assertTrue(children.hasNext());
assertSame(foo, children.next());
assertTrue(children.hasNext());
assertSame(bar, children.next());
assertFalse(children.hasNext());
Iterator<Object> payloads = parent.descendants(Object.class).iterator();
assertFalse(payloads.hasNext());
}
@Test
public void requireThatNonRootNodeCanNotBeAdded() {
TraceNode foo = new TraceNode(null, 0);
TraceNode bar = new TraceNode(null, 0);
TraceNode baz = new TraceNode(null, 0);
bar.add(baz);
try {
foo.add(baz);
fail();
} catch (IllegalArgumentException e) {
}
assertSame(bar, baz.parent());
assertTrue(bar.children().iterator().hasNext());
assertFalse(foo.children().iterator().hasNext());
}
@Test
public void requireThatChildrenIsNeverNull() {
assertNotNull(new TraceNode(null, 69).children());
}
@Test
public void requireThatDescendantsIsNeverNull() {
assertNotNull(new TraceNode(null, 69).descendants(Object.class));
}
@Test
public void requireThatDescendantsOrderIsDepthFirstPrefix() {
TraceNode trace = new TraceNode(null, 0)
.add(new TraceNode("a", 0)
.add(new TraceNode("b", 0))
.add(new TraceNode("c", 0)
.add(new TraceNode("d", 0))
.add(new TraceNode("e", 0))))
.add(new TraceNode("f", 0)
.add(new TraceNode("g", 0)));
Iterator<String> it = trace.descendants(String.class).iterator();
assertTrue(it.hasNext());
assertEquals("a", it.next());
assertTrue(it.hasNext());
assertEquals("b", it.next());
assertTrue(it.hasNext());
assertEquals("c", it.next());
assertTrue(it.hasNext());
assertEquals("d", it.next());
assertTrue(it.hasNext());
assertEquals("e", it.next());
assertTrue(it.hasNext());
assertEquals("f", it.next());
assertTrue(it.hasNext());
assertEquals("g", it.next());
assertFalse(it.hasNext());
}
@Test
public void requireThatDescendantsFilterPayloads() {
TraceNode trace = new TraceNode(null, 0)
.add(new TraceNode("a", 0)
.add(new TraceNode(69, 0))
.add(new TraceNode("b", 0)
.add(new TraceNode("c", 0))
.add(new TraceNode(new Object(), 0))))
.add(new TraceNode("d", 0)
.add(new TraceNode("e", 0)));
Iterator<String> it = trace.descendants(String.class).iterator();
assertTrue(it.hasNext());
assertEquals("a", it.next());
assertTrue(it.hasNext());
assertEquals("b", it.next());
assertTrue(it.hasNext());
assertEquals("c", it.next());
assertTrue(it.hasNext());
assertEquals("d", it.next());
assertTrue(it.hasNext());
assertEquals("e", it.next());
assertFalse(it.hasNext());
}
@Test
public void requireThatVisitorOrderIsDepthFirstPrefix() {
TraceNode trace = new TraceNode(null, 0)
.add(new TraceNode("a", 0)
.add(new TraceNode("b", 0))
.add(new TraceNode("c", 0)
.add(new TraceNode("d", 0))
.add(new TraceNode(3, 0))))
.add(new TraceNode("f", 0)
.add(new TraceNode("g", 0)));
final List<Object> payloads = new ArrayList<>();
trace.accept(new TraceVisitor() {
@Override
public void visit(TraceNode node) {
payloads.add(node.payload());
}
});
assertEquals(Arrays.<Object>asList(null, "a", "b", "c", "d", 3, "f", "g"),
payloads);
}
@Test
public void requireThatVisitorDoesNotEnterOrLeaveNodesThatHaveNoChildren() {
TraceNode trace = new TraceNode(null, 0);
trace.accept(new TraceVisitor() {
@Override
public void visit(TraceNode node) {
}
@Override
public void entering(TraceNode node) {
fail();
}
@Override
public void leaving(TraceNode node) {
fail();
}
});
}
@Test
public void requireThatVisitorEntersAndLeavesNodesThatHaveChildren() {
TraceNode trace = new TraceNode("", 0)
.add(new TraceNode("a", 0)
.add(new TraceNode("b", 0))
.add(new TraceNode("c", 0)
.add(new TraceNode("d", 0))
.add(new TraceNode("e", 0))))
.add(new TraceNode("f", 0)
.add(new TraceNode("g", 0)));
final StringBuilder out = new StringBuilder();
trace.accept(new TraceVisitor() {
@Override
public void visit(TraceNode node) {
out.append(node.payload());
}
@Override
public void entering(TraceNode node) {
out.append("[");
}
@Override
public void leaving(TraceNode node) {
out.append("]");
}
});
assertEquals("[a[bc[de]]f[g]]", out.toString());
}
}
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