BAEL-6846 - Convert from float to BigDecimal

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

@@ -0,0 +1,60 @@
+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 whenCreatedFromCertainFloatValues_thenMatches() {
+        float floatToConvert = 0.5f;
+        BigDecimal bdFromFloat = new BigDecimal(floatToConvert);
+        assertEquals("0.5", bdFromFloat.toString());
+    }
+
+    @Test
+    public void whenCreatedFromCertainFloatValues_thenDoesNotMatch() {
+        float floatToConvert = 1.1f;
+        BigDecimal bdFromFloat = new BigDecimal(floatToConvert);
+        assertNotEquals("1.1", bdFromFloat.toString());
+    }
+
+    @Test
+    public void whenCreatedFromString_thenMatches() {
+        String floatValue = Float.toString(1.1f);
+        BigDecimal bdFromString = new BigDecimal(floatValue);
+        assertEquals("1.1", bdFromString.toString());
+    }
+
+    @Test
+    public void whenCreatedByValueOfAndIsFloat_thenDoesNotMatch() {
+        float floatToConvert = 1.1f;
+        BigDecimal bdByValueOf = BigDecimal.valueOf(floatToConvert);
+        assertNotEquals("1.1", bdByValueOf.toString());
+    }
+
+    @Test
+    public void whenFloatCastToDouble_thenGotADifferentNumber() {
+        float floatToConvert = 1.1f;
+        double doubleCast = floatToConvert;
+        assertEquals("1.100000023841858", Double.toString(doubleCast));
+    }
+
+    @Test
+    public void whenCreatedByValueOfAndIsDouble_thenMatches() {
+        double doubleToConvert = 1.1d;
+        BigDecimal bdByValueOf = BigDecimal.valueOf(doubleToConvert);
+        assertEquals("1.1", bdByValueOf.toString());
+    }
+
+}