diff --git a/moneta/src/test/java/tools/jackson/datatype/moneta/CurrencyUnitDeserializerTest.java b/moneta/src/test/java/tools/jackson/datatype/moneta/CurrencyUnitDeserializerTest.java
index c4aaa894..061227bb 100644
--- a/moneta/src/test/java/tools/jackson/datatype/moneta/CurrencyUnitDeserializerTest.java
+++ b/moneta/src/test/java/tools/jackson/datatype/moneta/CurrencyUnitDeserializerTest.java
@@ -6,6 +6,7 @@
 
 import tools.jackson.databind.ObjectMapper;
 import tools.jackson.databind.exc.InvalidFormatException;
+import tools.jackson.databind.exc.MismatchedInputException;
 import tools.jackson.databind.json.JsonMapper;
 import tools.jackson.databind.jsontype.BasicPolymorphicTypeValidator;
 
@@ -29,10 +30,29 @@ public void shouldDeserialize() throws Exception {
     @Test
     public void shouldNotDeserializeInvalidCurrency() {
         final InvalidFormatException e = assertThrows(InvalidFormatException.class, () ->
-                unit.readValue("\"FOO\"", CurrencyUnit.class));
+                unit.readValue(a2q("'FOO'"), CurrencyUnit.class));
+        assertThat(e.getMessage()).contains("FOO");
         assertThat(e.getValue()).isEqualTo("FOO");
     }
 
+    @Test
+    public void shouldNotDeserializeFromNumber() {
+        assertThrows(MismatchedInputException.class, () ->
+                unit.readValue("12", CurrencyUnit.class));
+    }
+
+    @Test
+    public void shouldNotDeserializeFromObject() {
+        assertThrows(MismatchedInputException.class, () ->
+                unit.readValue(a2q("{'a':1}"), CurrencyUnit.class));
+    }
+
+    @Test
+    public void shouldNotDeserializeFromArray() {
+        assertThrows(MismatchedInputException.class, () ->
+                unit.readValue("[1,2]", CurrencyUnit.class));
+    }
+
     @Test
     public void shouldDeserializeWithTyping() throws Exception {
         ObjectMapper mapper = JsonMapper.builder()
@@ -45,4 +65,8 @@ public void shouldDeserializeWithTyping() throws Exception {
 
         assertThat(actual).isEqualTo(expected);
     }
+
+    private static String a2q(final String json) {
+        return json.replace("'", "\"");
+    }
 }