fix: create BigDecimal as SpecialSpecimen

Refs: #85

Author: akutschera

src/main/java/com/github/nylle/javafixture/SpecimenType.java

@@ -165,6 +165,9 @@ public boolean isSpecialType() {
         if (asClass().equals(java.math.BigInteger.class)) {
             return true;
         }
+        if (asClass().equals(java.math.BigDecimal.class)) {
+            return true;
+        }
         if (asClass().equals(java.io.File.class)) {
             return true;
         }

src/main/java/com/github/nylle/javafixture/specimen/SpecialSpecimen.java

@@ -3,10 +3,12 @@
 import com.github.nylle.javafixture.Context;
 import com.github.nylle.javafixture.CustomizationContext;
 import com.github.nylle.javafixture.ISpecimen;
+import com.github.nylle.javafixture.PseudoRandom;
 import com.github.nylle.javafixture.SpecimenType;
 
 import java.io.File;
 import java.lang.annotation.Annotation;
+import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -44,6 +46,9 @@ public T create(CustomizationContext customizationContext, Annotation[] annotati
         if (type.asClass().equals(BigInteger.class)) {
             return (T) createBigInteger();
         }
+        if (type.asClass().equals(BigDecimal.class)) {
+            return (T) createBigDecimal();
+        }
         try {
             return (T) new URI("https://localhost/" + UUID.randomUUID());
         } catch (URISyntaxException e) {
@@ -61,4 +66,12 @@ private BigInteger createBigInteger() {
         }
         return result;
     }
+
+    private BigDecimal createBigDecimal() {
+        var bd = new BigDecimal(new PseudoRandom().nextLong(new Random().nextBoolean()));
+        if (context.getConfiguration().usePositiveNumbersOnly()) {
+            return bd.abs();
+        }
+        return bd;
+    }
 }

src/test/java/com/github/nylle/javafixture/SpecimenTypeTest.java

@@ -16,6 +16,7 @@
 import java.io.File;
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
+import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.net.URI;
 import java.time.Duration;
@@ -262,13 +263,15 @@ void isSpecialType() {
         assertThat(new SpecimenType<File>() {}.isSpecialType()).isTrue();
         assertThat(new SpecimenType<URI>() {}.isSpecialType()).isTrue();
         assertThat(new SpecimenType<BigInteger>() {}.isSpecialType()).isTrue();
+        assertThat(new SpecimenType<BigDecimal>() {}.isSpecialType()).isTrue();
     }
 
     @TestWithCases
     @TestCase(class1 = String.class, bool2 = false)
     @TestCase(class1 = File.class, bool2 = true)
     @TestCase(class1 = URI.class, bool2 = true)
     @TestCase(class1 = BigInteger.class, bool2 = true)
+    @TestCase(class1 = BigDecimal.class, bool2 = true)
     void isSpecialTypeFromClass(Class<?> value, boolean expected) {
         assertThat(SpecimenType.fromClass(value).isSpecialType()).isEqualTo(expected);
     }

src/test/java/com/github/nylle/javafixture/specimen/SpecialSpecimenTest.java

@@ -11,6 +11,7 @@
 
 import java.io.File;
 import java.lang.annotation.Annotation;
+import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.net.URI;
 import java.util.Map;
@@ -111,4 +112,22 @@ void createNonNegativeBigInteger() {
         assertThat(actual).isNotNegative();
     }
 
+    @Test
+    @DisplayName("create BigDecimal creates random number")
+    void createBigDecimal() {
+        var sut = new SpecialSpecimen<>(new SpecimenType<BigDecimal>() {}, context);
+        var actual = sut.create(noContext(), new Annotation[0]);
+
+        assertThat(actual).isInstanceOf(BigDecimal.class);
+    }
+
+    @Test
+    @DisplayName("create BigDecimal acreates non-negative random number when context demands it")
+    void createNonNegativeBigDecimal() {
+        var context = new Context(Configuration.configure().usePositiveNumbersOnly(true));
+        var sut = new SpecialSpecimen<>(new SpecimenType<BigDecimal>() {}, context);
+        var actual = sut.create(noContext(), new Annotation[0]);
+
+        assertThat(actual).isNotNegative();
+    }
 }