From 36edee6be794d1a07dd95db2a3550d196c0a8484 Mon Sep 17 00:00:00 2001
From: Eugene Kovko <37694937+eukovko@users.noreply.github.com>
Date: Mon, 8 Jan 2024 03:50:22 +0100
Subject: [PATCH] BAEL-7447: Integer to BigDecimal (#15563)

---
 ...BigDecimalConversionArgumentsProvider.java | 33 ++++++++++++
 .../IntegerToBigDecimalUnitTest.java          | 53 +++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/integertobigdecimal/BigDecimalConversionArgumentsProvider.java
 create mode 100644 core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/integertobigdecimal/IntegerToBigDecimalUnitTest.java

diff --git a/core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/integertobigdecimal/BigDecimalConversionArgumentsProvider.java b/core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/integertobigdecimal/BigDecimalConversionArgumentsProvider.java
new file mode 100644
index 0000000000..8b9900ee9e
--- /dev/null
+++ b/core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/integertobigdecimal/BigDecimalConversionArgumentsProvider.java
@@ -0,0 +1,33 @@
+package com.baeldung.integertobigdecimal;
+
+import java.math.BigDecimal;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.ArgumentsProvider;
+
+public class BigDecimalConversionArgumentsProvider implements ArgumentsProvider {
+
+    @Override
+    public Stream<? extends Arguments> provideArguments(ExtensionContext context) {
+        return Stream.of(
+          Arguments.of(Integer.valueOf(0), BigDecimal.valueOf(0)),
+          Arguments.of(Integer.valueOf(1), BigDecimal.valueOf(1)),
+          Arguments.of(Integer.valueOf(2), BigDecimal.valueOf(2)),
+          Arguments.of(Integer.valueOf(3), BigDecimal.valueOf(3)),
+          Arguments.of(Integer.valueOf(4), BigDecimal.valueOf(4)),
+          Arguments.of(Integer.valueOf(5), BigDecimal.valueOf(5)),
+          Arguments.of(Integer.valueOf(6), BigDecimal.valueOf(6)),
+          Arguments.of(Integer.valueOf(7), BigDecimal.valueOf(7)),
+          Arguments.of(Integer.valueOf(8), BigDecimal.valueOf(8)),
+          Arguments.of(Integer.valueOf(9), BigDecimal.valueOf(9)),
+          Arguments.of(Integer.valueOf(10), BigDecimal.valueOf(10)),
+          Arguments.of(Integer.valueOf(11), BigDecimal.valueOf(11)),
+          Arguments.of(Integer.valueOf(12), BigDecimal.valueOf(12)),
+          Arguments.of(Integer.valueOf(13), BigDecimal.valueOf(13)),
+          Arguments.of(Integer.valueOf(14), BigDecimal.valueOf(14)),
+          Arguments.of(Integer.valueOf(15), BigDecimal.valueOf(15))
+        );
+    }
+
+}
diff --git a/core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/integertobigdecimal/IntegerToBigDecimalUnitTest.java b/core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/integertobigdecimal/IntegerToBigDecimalUnitTest.java
new file mode 100644
index 0000000000..111670efc3
--- /dev/null
+++ b/core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/integertobigdecimal/IntegerToBigDecimalUnitTest.java
@@ -0,0 +1,53 @@
+package com.baeldung.integertobigdecimal;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.math.BigDecimal;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ArgumentsSource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class IntegerToBigDecimalUnitTest {
+
+    @ParameterizedTest
+    @ArgumentsSource(BigDecimalConversionArgumentsProvider.class)
+    void giveIntegerWhenConvertWithConstructorToBigDecimalThenConversionCorrect(Integer given, BigDecimal expected) {
+        BigDecimal actual = new BigDecimal(given);
+        assertThat(actual).isEqualTo(expected);
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10})
+    void giveIntegerWhenConvertWithConstructorToBigDecimalThenConversionWithoutCaching(Integer given) {
+        BigDecimal firstBigDecimal = new BigDecimal(given);
+        BigDecimal secondBigDecimal = new BigDecimal(given);
+        assertThat(firstBigDecimal)
+          .isEqualTo(secondBigDecimal)
+          .isNotSameAs(secondBigDecimal);
+    }
+
+    @ParameterizedTest
+    @ArgumentsSource(BigDecimalConversionArgumentsProvider.class)
+    void giveIntegerWhenConvertWithValueOfToBigDecimalThenConversionCorrect(Integer given, BigDecimal expected) {
+        BigDecimal actual = BigDecimal.valueOf(given);
+        assertThat(actual).isEqualTo(expected);
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10})
+    void giveIntegerWhenConvertWithValueOfToBigDecimalThenConversionCachesTheResults(Integer given) {
+        BigDecimal firstBigDecimal = BigDecimal.valueOf(given);
+        BigDecimal secondBigDecimal = BigDecimal.valueOf(given);
+        assertThat(firstBigDecimal).isSameAs(secondBigDecimal);
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = {11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21})
+    void giveIntegerWhenConvertWithValueOfToBigDecimalThenConversionWontCacheTheResults(Integer given) {
+        BigDecimal firstBigDecimal = BigDecimal.valueOf(given);
+        BigDecimal secondBigDecimal = BigDecimal.valueOf(given);
+        assertThat(firstBigDecimal)
+          .isEqualTo(secondBigDecimal)
+          .isNotSameAs(secondBigDecimal);
+    }
+}