Merge pull request #14807 from mcasari/master

BAEL-6846 - Converting from Float to BigDecimal in Java

core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/floattobigdecimal/FloatToBigDecimalUnitTest.java

@@ -0,0 +1,49 @@
+package com.baeldung.floattobigdecimal;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+import java.math.BigDecimal;
+
+import org.junit.jupiter.api.Test;
+
+class FloatToBigDecimalUnitTest {
+
+    @Test
+    public void whenFloatComparedWithDifferentValues_thenCouldMatch() {
+        assertNotEquals(1.1f, 1.09f);
+        assertEquals(1.1f, 1.09999999f);
+    }
+
+    @Test
+    public void whenCreatedFromFloat_thenMatchesInternallyStoredValue() {
+        float floatToConvert = 1.10000002384185791015625f;
+        BigDecimal bdFromFloat = new BigDecimal(floatToConvert);
+        assertEquals("1.10000002384185791015625", bdFromFloat.toString());
+    }
+
+    @Test
+    public void whenCreatedFromString_thenPreservesTheOriginal() {
+        BigDecimal bdFromString = new BigDecimal("1.1");
+        assertEquals("1.1", bdFromString.toString());
+    }
+
+    @Test
+    public void whenCreatedFromFloatConvertedToString_thenFloatInternalValueGetsTruncated() {
+        String floatValue = Float.toString(1.10000002384185791015625f);
+        BigDecimal bdFromString = new BigDecimal(floatValue);
+        assertEquals("1.1", floatValue);
+        assertEquals("1.1", bdFromString.toString());
+    }
+
+    @Test
+    public void whenCreatedByValueOf_thenFloatValueGetsTruncated() {
+        assertEquals("1.100000023841858", BigDecimal.valueOf(1.10000002384185791015625f).toString());
+    }
+
+    @Test
+    public void whenDoubleConvertsFloatToString_thenFloatValueGetsTruncated() {
+        assertEquals("1.100000023841858", Double.toString(1.10000002384185791015625f));
+    }
+
+}