diff --git a/decode_test.go b/decode_test.go
index 0611bb5..533664f 100644
--- a/decode_test.go
+++ b/decode_test.go
@@ -7,6 +7,73 @@ import (
 )
 
 func Test_Decoder(t *testing.T) {
+	t.Run("int", func(t *testing.T) {
+		var v int
+		assertErr(t, json.Unmarshal([]byte(`-1`), &v))
+		assertEq(t, "int", int(-1), v)
+	})
+	t.Run("int8", func(t *testing.T) {
+		var v int8
+		assertErr(t, json.Unmarshal([]byte(`-2`), &v))
+		assertEq(t, "int8", int8(-2), v)
+	})
+	t.Run("int16", func(t *testing.T) {
+		var v int16
+		assertErr(t, json.Unmarshal([]byte(`-3`), &v))
+		assertEq(t, "int16", int16(-3), v)
+	})
+	t.Run("int32", func(t *testing.T) {
+		var v int32
+		assertErr(t, json.Unmarshal([]byte(`-4`), &v))
+		assertEq(t, "int32", int32(-4), v)
+	})
+	t.Run("int64", func(t *testing.T) {
+		var v int64
+		assertErr(t, json.Unmarshal([]byte(`-5`), &v))
+		assertEq(t, "int64", int64(-5), v)
+	})
+	t.Run("uint", func(t *testing.T) {
+		var v uint
+		assertErr(t, json.Unmarshal([]byte(`1`), &v))
+		assertEq(t, "uint", uint(1), v)
+	})
+	t.Run("uint8", func(t *testing.T) {
+		var v uint8
+		assertErr(t, json.Unmarshal([]byte(`2`), &v))
+		assertEq(t, "uint8", uint8(2), v)
+	})
+	t.Run("uint16", func(t *testing.T) {
+		var v uint16
+		assertErr(t, json.Unmarshal([]byte(`3`), &v))
+		assertEq(t, "uint16", uint16(3), v)
+	})
+	t.Run("uint32", func(t *testing.T) {
+		var v uint32
+		assertErr(t, json.Unmarshal([]byte(`4`), &v))
+		assertEq(t, "uint32", uint32(4), v)
+	})
+	t.Run("uint64", func(t *testing.T) {
+		var v uint64
+		assertErr(t, json.Unmarshal([]byte(`5`), &v))
+		assertEq(t, "uint64", uint64(5), v)
+	})
+	t.Run("bool", func(t *testing.T) {
+		t.Run("true", func(t *testing.T) {
+			var v bool
+			assertErr(t, json.Unmarshal([]byte(`true`), &v))
+			assertEq(t, "bool", true, v)
+		})
+		t.Run("false", func(t *testing.T) {
+			v := true
+			assertErr(t, json.Unmarshal([]byte(`false`), &v))
+			assertEq(t, "bool", false, v)
+		})
+	})
+	t.Run("string", func(t *testing.T) {
+		var v string
+		assertErr(t, json.Unmarshal([]byte(`"hello"`), &v))
+		assertEq(t, "string", "hello", v)
+	})
 	t.Run("struct", func(t *testing.T) {
 		type T struct {
 			AA int    `json:"aa"`
@@ -35,5 +102,7 @@ func Test_Decoder(t *testing.T) {
 		assertEq(t, "struct.B", "hello", v.B)
 		assertEq(t, "struct.C", true, v.C)
 		assertEq(t, "struct.D.AA", 2, v.D.AA)
+		assertEq(t, "struct.D.BB", "world", v.D.BB)
+		assertEq(t, "struct.D.CC", true, v.D.CC)
 	})
 }