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array/ArraysTest.java

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import static org.junit.Assert.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
/**
* Test-Klasse für Array-Übungen.
*/
public class ArraysTest {
private Arrays arrays;
@Before
public void setUp() {
arrays = new Arrays();
}
@Test
public void testGenerateIntArray() {
int[] arr;
for( int i = 0; i < 50; i += 5 ) {
arr = arrays.generateIntArray(i, 0, 100);
assertNotNull("Int-Array darf nicht <null> sein.", arr);
assertEquals("Arraylänge passt nicht.", i, arr.length);
}
arr = arrays.generateIntArray(-6, 0, 100);
assertEquals("Bei negativer pNumberOfElements muss das Array leer sein.", 0, arr.length);
}
@Test
public void testGenerateStringArray() {
String[] arr;
for( int i = 0; i < 50; i += 5 ) {
arr = arrays.generateStringArray(i);
assertNotNull("String-Array darf nicht <null> sein.", arr);
assertEquals("Arraylänge passt nicht.", i, arr.length);
}
arr = arrays.generateStringArray(-8);
assertEquals("Bei negativer pNumberOfElements muss das Array leer sein.", 0, arr.length);
}
@Test
public void testGenerateBooleanArray() {
boolean[] arr;
for( int i = 0; i < 50; i += 5 ) {
arr = arrays.generateBooleanArray(i);
assertNotNull("Boolean-Array darf nicht <null> sein.", arr);
assertEquals("Arraylänge passt nicht.", i, arr.length);
}
arr = arrays.generateBooleanArray(-4);
assertEquals("Bei negativer pNumberOfElements muss das Array leer sein.", 0, arr.length);
}
@Test
public void testMin() {
int min;
min = arrays.min(new int[]{1,4,12,15,28});
assertEquals("min(1,4,12,15,28)", 1, min);
min = arrays.min(new int[]{5,4,3,2,1,0});
assertEquals("min(5,4,3,2,1,0)", 0, min);
min = arrays.min(new int[]{1,2,3,4,5,-6,-7,-8});
assertEquals("min(1,2,3,4,5,-6,-7,-8)", -8, min);
min = arrays.min(new int[]{10000});
assertEquals("min(10000)", 10000, min);
min = arrays.min(new int[]{});
assertEquals("min()", 0, min);
}
@Test
public void testMax() {
int max;
max = arrays.max(new int[]{1,4,12,15,28});
assertEquals("max(1,4,12,15,28)", 28, max);
max = arrays.max(new int[]{5,4,3,2,1,0});
assertEquals("max(5,4,3,2,1,0)", 5, max);
max = arrays.max(new int[]{1,2,3,4,5,-6,-7,-8});
assertEquals("max(1,2,3,4,5,-6,-7,-8)", 5, max);
max = arrays.max(new int[]{-10000});
assertEquals("max(-10000)", -10000, max);
max = arrays.max(new int[]{});
assertEquals("max()", 0, max);
}
@Test
public void testSum() {
int sum;
sum = arrays.sum(new int[]{1,4,12,15,28});
assertEquals(60, sum);
sum = arrays.sum(new int[]{5,4,3,2,1,0});
assertEquals(15, sum);
sum = arrays.sum(new int[]{1,2,3,4,5,-6,-7,-8});
assertEquals(-6, sum);
sum = arrays.sum(new int[]{-10000,10000});
assertEquals(0, sum);
sum = arrays.sum(new int[]{4});
assertEquals(4, sum);
sum = arrays.sum(new int[]{});
assertEquals(0, sum);
}
@Test
public void testAvg() {
double avg;
avg = arrays.avg(new int[]{1,4,12,15,28});
assertEquals(12.0, avg, 0.0001);
avg = arrays.avg(new int[]{5,4,3,2,1,0});
assertEquals(2.5, avg, 0.0001);
avg = arrays.avg(new int[]{1,2,3,4,5,-6,-7,-8});
assertEquals(-0.75, avg, 0.0001);
avg = arrays.avg(new int[]{-10000,10000});
assertEquals(0.0, avg, 0.0001);
avg = arrays.avg(new int[]{4});
assertEquals(4.0, avg, 0.0001);
avg = arrays.avg(new int[]{});
assertEquals(0.0, avg, 0.0001);
}
@Test
public void testAnd() {
boolean bln;
bln = arrays.and(new boolean[]{true,true,true,true});
assertTrue(bln);
bln = arrays.and(new boolean[]{true});
assertTrue(bln);
bln = arrays.and(new boolean[]{true,false,true,true});
assertFalse(bln);
bln = arrays.and(new boolean[]{false,false,false,false});
assertFalse(bln);
bln = arrays.and(new boolean[]{false});
assertFalse(bln);
bln = arrays.and(new boolean[]{});
assertFalse(bln);
}
@Test
public void testOr() {
boolean bln;
bln = arrays.or(new boolean[]{true,true,true,true});
assertTrue(bln);
bln = arrays.or(new boolean[]{true});
assertTrue(bln);
bln = arrays.or(new boolean[]{true,false,true,true});
assertTrue(bln);
bln = arrays.or(new boolean[]{false,false,false,false});
assertFalse(bln);
bln = arrays.or(new boolean[]{false});
assertFalse(bln);
bln = arrays.or(new boolean[]{});
assertFalse(bln);
}
@Test
public void testXor() {
boolean bln;
bln = arrays.xor(new boolean[]{true,true,true,true});
assertFalse(bln);
bln = arrays.xor(new boolean[]{true});
assertTrue(bln);
bln = arrays.xor(new boolean[]{true,false,true,true});
assertFalse(bln);
bln = arrays.xor(new boolean[]{true,false,false,false});
assertTrue(bln);
bln = arrays.xor(new boolean[]{false,false,false,false});
assertFalse(bln);
bln = arrays.xor(new boolean[]{false,false,false,true});
assertTrue(bln);
bln = arrays.xor(new boolean[]{false});
assertFalse(bln);
bln = arrays.xor(new boolean[]{});
assertFalse(bln);
}
@Test
public void testConcat() {
String str;
str = arrays.concat(new String[]{"Foo","Bar"});
assertEquals("FooBar", str);
str = arrays.concat(new String[]{"Foo","Bar","Foo"});
assertEquals("FooBarFoo", str);
str = arrays.concat(new String[]{});
assertEquals("", str);
}
@Test
public void testJoin() {
String str;
str = arrays.join(new String[]{"Foo","Bar"}, ";");
assertEquals("Foo;Bar", str);
str = arrays.join(new String[]{"Foo","Bar","Foo"}, "----");
assertEquals("Foo----Bar----Foo", str);
str = arrays.join(new String[]{}, "");
assertEquals("", str);
}
@Test
public void testPrefix() {
String[] arr;
arr = arrays.prefix(new String[]{"Foo","Bar","Hello"}, "--");
assertNotNull(arr);
assertEquals(3, arr.length);
assertEquals("--Foo", arr[0]);
assertEquals("--Bar", arr[1]);
assertEquals("--Hello", arr[2]);
arr = arrays.prefix(new String[]{}, "");
assertNotNull(arr);
assertEquals(0, arr.length);
}
@Test
public void testReverse() {
String[] arr;
arr = arrays.reverse(new String[]{"Foo","Bar","Hello"});
assertNotNull(arr);
assertEquals(3, arr.length);
assertEquals("Hello", arr[0]);
assertEquals("Bar", arr[1]);
assertEquals("Foo", arr[2]);
arr = arrays.reverse(new String[]{"Foo","Bar"});
assertNotNull(arr);
assertEquals(2, arr.length);
assertEquals("Bar", arr[0]);
assertEquals("Foo", arr[1]);
arr = arrays.reverse(new String[]{});
assertNotNull(arr);
assertEquals(0, arr.length);
}
@Test
public void testOver() {
int count;
count = arrays.over(new int[]{1,4,12,15,28}, 10);
assertEquals(3, count);
count = arrays.over(new int[]{1,4,12,15,28}, 2);
assertEquals(4, count);
count = arrays.over(new int[]{1,4,12,15,28}, 28);
assertEquals(0, count);
count = arrays.over(new int[]{1,4,12,15,28}, -100);
assertEquals(5, count);
count = arrays.over(new int[]{1}, 1);
assertEquals(0, count);
count = arrays.over(new int[]{1}, 2);
assertEquals(0, count);
count = arrays.over(new int[]{1}, 0);
assertEquals(1, count);
count = arrays.over(new int[]{}, 0);
assertEquals(0, count);
count = arrays.over(new int[]{}, 100);
assertEquals(0, count);
count = arrays.over(new int[]{}, -10);
assertEquals(0, count);
}
@Test
public void testGenerateFibonacci() {
int[] fib;
fib = arrays.generateFibonacci(1);
assertNotNull(fib);
assertEquals(1, fib.length);
assertEquals(1, fib[0]);
fib = arrays.generateFibonacci(2);
assertNotNull(fib);
assertEquals(2, fib.length);
assertEquals(1, fib[0]);
assertEquals(1, fib[1]);
fib = arrays.generateFibonacci(4);
assertNotNull(fib);
assertEquals(4, fib.length);
assertEquals(1, fib[0]);
assertEquals(1, fib[1]);
assertEquals(2, fib[2]);
assertEquals(3, fib[3]);
fib = arrays.generateFibonacci(6);
assertNotNull(fib);
assertEquals(6, fib.length);
assertEquals(1, fib[0]);
assertEquals(1, fib[1]);
assertEquals(2, fib[2]);
assertEquals(3, fib[3]);
assertEquals(5, fib[4]);
assertEquals(8, fib[5]);
fib = arrays.generateFibonacci(0);
assertNotNull(fib);
assertEquals(0, fib.length);
fib = arrays.generateFibonacci(-4);
assertNotNull(fib);
assertEquals(0, fib.length);
}
}
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