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add a test for 270

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	`1`	`+packagecom.fishercoder;`
	`2`	`+`
	`3`	`+importcom.fishercoder.common.classes.TreeNode;`
	`4`	`+importcom.fishercoder.common.utils.TreeUtils;`
	`5`	`+importcom.fishercoder.solutions._270;`
	`6`	`+importorg.junit.BeforeClass;`
	`7`	`+importorg.junit.Test;`
	`8`	`+`
	`9`	`+importjava.util.Arrays;`
	`10`	`+`
	`11`	`+importstaticjunit.framework.Assert.assertEquals;`
	`12`	`+`
	`13`	`+publicclass_270Test {`
	`14`	`+privatestatic_270.Solution1solution1;`
	`15`	`+privatestaticintexpected;`
	`16`	`+privatestaticTreeNoderoot;`
	`17`	`+privatestaticdoubletarget;`
	`18`	`+`
	`19`	`+@BeforeClass`
	`20`	`+publicstaticvoidsetup() {`
	`21`	`+solution1 =new_270.Solution1();`
	`22`	`+ }`
	`23`	`+`
	`24`	`+@Test`
	`25`	`+publicvoidtest1() {`
	`26`	`+root =TreeUtils.constructBinaryTree(Arrays.asList(4,2,5,1,3));`
	`27`	`+expected =4;`
	`28`	`+target =3.714286;`
	`29`	`+assertEquals(expected,solution1.closestValue(root,target));`
	`30`	`+ }`
	`31`	`+`
	`32`	`+}`

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