Merge pull request #16467 from sk1418/int-to-boolean

[int-to-boolean] int->boolean

Author: theangrydev

core-java-modules/core-java-numbers-4/src/test/java/com/baeldung/booleantoint/IntToBooleanUnitTest.java

@@ -0,0 +1,59 @@
+package com.baeldung.booleantoint;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.apache.commons.lang3.BooleanUtils;
+import org.junit.jupiter.api.Test;
+
+public class IntToBooleanUnitTest {
+
+    boolean intToBoolean(int theInt) {
+        return theInt > 0;
+    }
+
+    boolean intToBooleanWithThrowing(int theInt) {
+        if (theInt == 1) {
+            return true;
+        }
+        if (theInt == 0) {
+            return false;
+        }
+        throw new IllegalArgumentException("Only 0 or 1 is allowed.");
+    }
+
+    @Test
+    void whenUsingBooleanExpression_thenGetExpectedResult() {
+        assertTrue(intToBoolean(42));
+        assertFalse(intToBoolean(0));
+        assertFalse(intToBoolean(-42));
+    }
+
+    @Test
+    void whenUsingIfBooleanExpression_thenGetExpectedResult() {
+        assertTrue(intToBooleanWithThrowing(1));
+        assertFalse(intToBooleanWithThrowing(0));
+        assertThrows(IllegalArgumentException.class, () -> intToBooleanWithThrowing(42));
+        assertThrows(IllegalArgumentException.class, () -> intToBooleanWithThrowing(-42));
+    }
+
+    @Test
+    void whenUsingBooleanUtilsToBoolean_thenGetExpectedResult() {
+        // calling BooleanUtils.toBoolean(int value)
+        assertTrue(BooleanUtils.toBoolean(1));
+        assertFalse(BooleanUtils.toBoolean(0));
+        assertTrue(BooleanUtils.toBoolean(42));
+        assertTrue(BooleanUtils.toBoolean(-42));
+
+        // calling BooleanUtils.toBoolean(int value, int trueValue, int falseValue)
+        int trueValue = 1;
+        int falseValue = 0;
+
+        assertTrue(BooleanUtils.toBoolean(1, trueValue, falseValue));
+        assertFalse(BooleanUtils.toBoolean(0, trueValue, falseValue));
+        assertThrows(IllegalArgumentException.class, () -> BooleanUtils.toBoolean(42, trueValue, falseValue));
+        assertThrows(IllegalArgumentException.class, () -> BooleanUtils.toBoolean(-42, trueValue, falseValue));
+    }
+
+}