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JUnit (and therefore Groovy unit testing) works by creating a class that inherits from TestCase or one of its descendants. GroovyTestCase is the appropriate class to extend for unit testing in Groovy. Notice that GroovyTestCase is found in the groovy.util package, so it is implicitly available and doesn t even require any imports. Tests can then be added by creating methods that have a name that begins with test and is followed by something descriptive about the test. For example, you could use testAlphaRanges for a test that validates the Groovy language feature of ranges. These test methods should take no parameters and return void. Unlike with JUnit tests written in Java, these methods don t have to declare exceptions that could be thrown, because Groovy naturally converts all checked exceptions into unchecked exceptions. This makes tests more readable than the equivalent Java implications. Unit tests often require objects to be put into a known state. In addition, tests should be good test-harness citizens and clean up after themselves. Like JUnit tests, all Groovy tests can override the setUp and tearDown methods. Unit tests are also a great way to learn new frameworks, libraries, and languages such as Groovy. You can use unit tests to validate your understanding of how they work. Listing 3-1 is a unit test used to validate some assumptions about Groovy ranges, including whether a range from 'a'..'z' contains uppercase letters and whether ranges can be concatenated together.

Sometimes I want to clear an area on the screen and put a box around it, clearing an area of the screen so that I can place information in it at a later time, perhaps in repsonse to user input or the completion of another task. Figure 12-4 shows the result.

The Assert class can throw an AssertFailedException or an AssertInconclusiveException. It is recommended not to catch these exceptions by your code since they provide the mechanism for communicating test results to the unit testing framework. There are two other Assert-related classes: StringAssert and CollectionAssert. StringAssert provides a set of methods useful for string-based conditional tests, and CollectionAssert does likewise for collections. Table 12-2 lists the methods of StringAssert, and Table 12-3 shows the methods of CollectionAssert.

01 class RangeTest extends GroovyTestCase { 02 03 def lowerCaseRange = 'a'..'z' 04 def upperCaseRange = 'A'..'Z' 05 06 void testLowerCaseRange() {

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As with some of the other tasks in this chapter, there are two functions for drawing a box around an arbitrary area: one that performs a task at the current cursor position, and another that moves to a certain position before doing its thing. Unlike the previous functions, these use different techniques. Since box_area_at knows its location (the first two arguments), it can return to that point to draw the inner box. On the other hand, box_area doesn t have that information, and to save and restore the position would be more complicated. It therefore proceeds on a one-way journey from top to bottom. Usage bx_border=$(...) bx_body=$(...) box_area WIDTH HEIGHT box_area_at ROW COL WIDTH HEIGHT As with box_block, the box_area functions take their colors and attributes from the bx_border and bx_body variables. cls bx_border=$(set_attr 0; set_bg $yellow) bx_body=$(set_attr 0 $bold; set_fgbg $blue $magenta) box_area_at 3 3 12 12 The Script box_area_at() { ## set the border style printf "$bx_border" ## clear the whole area with the border color clear_area_at $1 $2 $3 $(( $4 - 1 )) ## return to the top left corner, ## one square down and one to the right printat $(( $1 + 1 )) $(( $2 + 1 )) ## set the interior style printf "$bx_body" ## clear a smaller area with the body color clear_area $(( $3 - 2 )) $(( $4 - 3 )) }

Tests whether one string occurs somewhere within another string Tests whether two strings do not match Tests whether one string ends with another string Tests whether two strings match Tests whether one string starts with another string

07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 }

box_area() { printf "$bx_border$cu_save" ## print the top line with the border values printf "%${1}.${1}s$cu_NL" " " ## create a string to contain the border for each line ba_border="$bx_border $bx_body" ## calculate the width of the inside area ba_w=$(( $1 - 2 )) ## loop until we reach the bottom line ba_=2 while [ $ba_ -lt $2 ] do ## print the border left and right on each line printf "$ba_border%${ba_w}.${ba_w}s$ba_border$cu_NL" ba_=$(( $ba_ + 1 )) done ## print the bottom line of the box printf "$bx_border$cu_save" printf "%${1}.${1}s$cu_NL" " " }

assert 26 == lowerCaseRange.size() assertTrue(lowerCaseRange.contains('b')) assertFalse(lowerCaseRange.contains('B')) } void testUpperCaseRange() { assert 26 == upperCaseRange.size() assertTrue(upperCaseRange.contains('B')) assertFalse(upperCaseRange.contains('b')) } void testAlphaRange() { def alphaRange = lowerCaseRange + upperCaseRange assert 52 == alphaRange.size() assert alphaRange.contains('b') assert alphaRange.contains('B') }

AllItemsAreInstancesOfType AllItemsAreNotNull AllItemsAreUnique AreEqual AreEquivalent AreNotEqual AreNotEquivalent Contains DoesNotContain IsNotSubsetOf IsSubsetOf

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