Д3 Ширшова Анастасия

src/test/java/ru/odnoklassniki/generateIntSequence/TestGenerateIntSequence.java

@@ -0,0 +1,66 @@
+package ru.odnoklassniki.generateIntSequence;
+
+
+import org.junit.Assert;
+import org.junit.Test;
+import ru.odnoklassniki.ClassToBeTested;
+
+import java.util.List;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.hasSize;
+
+public class TestGenerateIntSequence {
+
+    @Test
+    public void testLengthOfSequenceIsEqualToItemsCount() throws Exception {
+        final int startingNumber = 0;
+        final int itemsCounts = 5;
+        final List<Integer> result = ClassToBeTested.generateIntSequence(startingNumber, itemsCounts);
+
+        Assert.assertThat(
+                "The length of sequence isn't equal to 5",
+                result,
+                hasSize(equalTo(itemsCounts))
+        );
+    }
+
+    @Test
+    public void testSequenceIsCorrect() throws Exception {
+        final int startingNumber = 4;
+        final int itemsCounts = 3;
+        final List<Integer> result = ClassToBeTested.generateIntSequence(startingNumber, itemsCounts);
+
+        Assert.assertNotNull(result);
+        Assert.assertEquals(3, result.size());
+        Assert.assertEquals(4, result.get(0).intValue());
+        Assert.assertEquals(5, result.get(1).intValue());
+        Assert.assertEquals(6, result.get(2).intValue());
+    }
+
+    @Test
+    public void testIfItemCounterIsNegativeExceptionThrown() throws Exception {
+        final int startingNumber = 1;
+        final int itemsCounts = -9;
+
+        try {
+            ClassToBeTested.generateIntSequence(startingNumber, itemsCounts);
+            Assert.fail("Method didn't throw an exception when ItemCounter is negative");
+        } catch (IllegalArgumentException e) {
+            Assert.assertEquals("itemsCount must be greater than 0", e.getMessage());
+        }
+    }
+
+    @Test
+    public void testIfFinishNumberIsGreaterThenIntMaxValueExceptionThrown() throws Exception {
+        final int startingNumber = Integer.MAX_VALUE - 1;
+        final int itemsCounts = 50;
+
+        try {
+            ClassToBeTested.generateIntSequence(startingNumber, itemsCounts);
+            Assert.fail("Method didn't throw an exception when final number is greater then integer.MAX_VALUE");
+        } catch (IllegalArgumentException e) {
+            Assert.assertEquals("can't generate an int greater than integer's max value", e.getMessage());
+        }
+    }
+}