public class TagBuilderTest in Java

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public class TagBuilderTest
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public void testBuildOneChild() { String expectedXml = "<flavors>"+ "<flavor/>" + "</flavors>";
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TagBuilder builder = new TagBuilder("flavors"); builderaddChild("flavor"); String actualXml = buildertoXml();
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assertXmlEquals(expectedXml, actualXml); }
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Here are the changes I make to pass this test:
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public class TagBuilder { private TagNode rootNode;
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private TagNode currentNode;
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public TagBuilder(String rootTagName) { rootNode = new TagNode(rootTagName);
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currentNode = rootNode;
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public void addChild(String childTagName) { TagNode parentNode = currentNode; currentNode = new TagNode(childTagName); parentNodeadd(currentNode); }
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public String toXml() { return rootNodetoString(); } }
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That was easy To fully test that the new code works, I make an even harder test and see if it runs successfully:
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public class TagBuilderTest
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public void testBuildChildrenOfChildren() { String expectedXml = "<flavors>"+ "<flavor>" + "<requirements>" + "<requirement/>" + "</requirements>" + "</flavor>" + "</flavors>";
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TagBuilder builder = new TagBuilder("flavors"); builderaddChild("flavor"); builderaddChild("requirements"); builderaddChild("requirement"); String actualXml = buildertoXml();
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assertXmlEquals(expectedXml, actualXml); }
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The code passes this test as well It's now time to handle another scenario adding a sibling Again, I write a failing test:
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public class TagBuilderTest
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public void testBuildSibling() { String expectedXml = "<flavors>"+ "<flavor1/>" + "<flavor2/>" + "</flavors>";
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TagBuilder builder = new TagBuilder("flavors"); builderaddChild("flavor1"); builderaddSibling("flavor2"); String actualXml = buildertoXml();
assertXmlEquals(expectedXml, actualXml); }
Adding a sibling for an existing child implies that there is a way for TagBuilder to know who the common parent is for the child and its new sibling There is currently no way to know this, as each TagNode instance doesn't store a reference to its parent So I write the following failing test to drive the creation of this needed behavior:
public class TagNodeTest
public void testParents() { TagNode root = new TagNode("root"); assertNull(rootgetParent());
TagNode childNode = new TagNode("child"); rootadd(childNode); assertEquals(root, childNodegetParent()); assertEquals("root", childNodegetParent()getName()); }
To pass this test, I add the following code to TagNode:
public class TagNode
private TagNode parent;
public void add(TagNode childNode) {
childNodesetParent(this);
children()add(childNode); }
private void setParent(TagNode parent) { thisparent = parent;
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public TagNode getParent() { return parent; }
With the new functionality in place, I can refocus on writing code to pass the testBuildSibling() test, listed earlier Here's the new code I write:
public class TagBuilder public void addChild(String childTagName) {
addTo(currentNode, childTagName);
public void addSibling(String siblingTagName) { addTo(currentNodegetParent(), siblingTagName); }
private void addTo(TagNode parentNode, String tagName) { currentNode = new TagNode(tagName); parentNodeadd(currentNode); }
Once again, the compiler and tests are happy with the new code I write additional tests to confirm that sibling and child behavior works under various conditions Now I need to handle a final child-building scenario: the case whenaddChild() or addSibling() won't work because a child must be added to a specific parent The test below indicates the problem:
public class TagBuilderTest
public void testRepeatingChildrenAndGrandchildren() { String expectedXml = "<flavors>"+ "<flavor>" + "<requirements>" +
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"<requirement/>" + "</requirements>" + "</flavor>" + "<flavor>" + "<requirements>" + "<requirement/>" + "</requirements>" + "</flavor>" + "</flavors>";
TagBuilder builder = new TagBuilder("flavors"); for (int i=0; i<2; i++) { builderaddChild("flavor"); builderaddChild("requirements"); builderaddChild("requirement"); }
assertXmlEquals(expectedXml, buildertoString()); }
The preceding test won't pass because it doesn't build what is expected When the loop runs for the second time, the call to the builder's addChild() method picks up where it left off, meaning that it adds a child to the last added node, which produces the following incorrect result:
<flavors> <flavor> <requirements> <requirement/>
<flavor> Error: misplaced tags <requirements> <requirement/> </requirements>
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</flavor>
</requirements> </flavor> <flavors>
To fix this problem, I change the test to refer to a method I call addToParent(), which enables a client to add a new node to a specific parent:
public class TagBuilderTest public void testRepeatingChildrenAndGrandchildren() TagBuilder builder = new TagBuilder("flavors"); for (int i=0; i<2; i++) { builder
addToParent("flavors", "flavor");
builderaddChild("requirements"); builderaddChild("requirement"); } assertXmlEquals(expectedXml, buildertoXml());
This test won't compile or run until I implementaddToParent() The idea behind addToParent() is that it will ask theTagBuilder's currentNode if its name matches the supplied parent name (passed via a parameter) If the name matches, the method will add a new child node to currentNode, or if the name doesn't match, the method will ask for currentNode's parent and continue the process until either a match is found or a null parent is encountered The pattern name for this behavior is Chain of Responsibility [DP] To implement the Chain of Responsibility, I write the following new code in TagBuilder: