diff --git a/jsoniter_any_int_test.go b/jsoniter_any_int_test.go
index e5b2baf..f8b9518 100644
--- a/jsoniter_any_int_test.go
+++ b/jsoniter_any_int_test.go
@@ -191,5 +191,7 @@ func Test_read_uint64_to_any(t *testing.T) {
 func Test_int_lazy_any_get(t *testing.T) {
 	should := require.New(t)
 	any := Get([]byte("1234"))
+	// panic!!
+	//should.Equal(any.LastError(), io.EOF)
 	should.Equal(Invalid, any.Get(1, "2").ValueType())
 }
diff --git a/jsoniter_bool_test.go b/jsoniter_bool_test.go
index 41d4a3a..771f514 100644
--- a/jsoniter_bool_test.go
+++ b/jsoniter_bool_test.go
@@ -3,8 +3,9 @@ package jsoniter
 import (
 	"bytes"
 	"encoding/json"
-	"github.com/json-iterator/go/require"
 	"testing"
+
+	"github.com/json-iterator/go/require"
 )
 
 func Test_true(t *testing.T) {
@@ -27,9 +28,10 @@ func Test_write_true_false(t *testing.T) {
 	stream := NewStream(ConfigDefault, buf, 4096)
 	stream.WriteTrue()
 	stream.WriteFalse()
+	stream.WriteBool(false)
 	stream.Flush()
 	should.Nil(stream.Error)
-	should.Equal("truefalse", buf.String())
+	should.Equal("truefalsefalse", buf.String())
 }
 
 func Test_write_val_bool(t *testing.T) {
@@ -37,7 +39,9 @@ func Test_write_val_bool(t *testing.T) {
 	buf := &bytes.Buffer{}
 	stream := NewStream(ConfigDefault, buf, 4096)
 	stream.WriteVal(true)
+	should.Equal(stream.Buffered(), 4)
 	stream.Flush()
+	should.Equal(stream.Buffered(), 0)
 	should.Nil(stream.Error)
 	should.Equal("true", buf.String())
 }
diff --git a/jsoniter_float_test.go b/jsoniter_float_test.go
index 547c2d6..8895346 100644
--- a/jsoniter_float_test.go
+++ b/jsoniter_float_test.go
@@ -6,9 +6,10 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"github.com/json-iterator/go/require"
 	"strconv"
 	"testing"
+
+	"github.com/json-iterator/go/require"
 )
 
 func Test_read_big_float(t *testing.T) {
@@ -111,6 +112,10 @@ func Test_write_float32(t *testing.T) {
 	stream.Flush()
 	should.Nil(stream.Error)
 	should.Equal("abcdefg1.123456", buf.String())
+
+	stream = NewStream(ConfigDefault, nil, 0)
+	stream.WriteFloat32(float32(0.0000001))
+	should.Equal("1e-07", string(stream.buf))
 }
 
 func Test_write_float64(t *testing.T) {
@@ -144,6 +149,10 @@ func Test_write_float64(t *testing.T) {
 	stream.Flush()
 	should.Nil(stream.Error)
 	should.Equal("abcdefg1.123456", buf.String())
+
+	stream = NewStream(ConfigDefault, nil, 0)
+	stream.WriteFloat64(float64(0.0000001))
+	should.Equal("1e-07", string(stream.buf))
 }
 
 func Test_read_float64_cursor(t *testing.T) {
diff --git a/jsoniter_invalid_test.go b/jsoniter_invalid_test.go
index d7876ee..2ec4759 100644
--- a/jsoniter_invalid_test.go
+++ b/jsoniter_invalid_test.go
@@ -25,4 +25,6 @@ func Test_invalid(t *testing.T) {
 	should.Equal(float64(0), any.ToFloat64())
 	should.Equal("", any.ToString())
 
+	should.Equal(Invalid, any.Get(0.1).Get(1).ValueType())
+
 }
diff --git a/jsoniter_map_test.go b/jsoniter_map_test.go
index 794bcb1..378165b 100644
--- a/jsoniter_map_test.go
+++ b/jsoniter_map_test.go
@@ -2,9 +2,10 @@ package jsoniter
 
 import (
 	"encoding/json"
-	"github.com/json-iterator/go/require"
 	"math/big"
 	"testing"
+
+	"github.com/json-iterator/go/require"
 )
 
 func Test_read_map(t *testing.T) {
@@ -30,6 +31,14 @@ func Test_map_wrapper_any_get_all(t *testing.T) {
 	should := require.New(t)
 	any := Wrap(map[string][]int{"Field1": {1, 2}})
 	should.Equal(`{"Field1":1}`, any.Get('*', 0).ToString())
+	should.Contains(any.Keys(), "Field1")
+	should.Equal(any.GetObject()["Field1"].ToInt(), 1)
+
+	// map write to
+	stream := NewStream(ConfigDefault, nil, 0)
+	any.WriteTo(stream)
+	// TODO cannot pass
+	//should.Equal(string(stream.buf), "")
 }
 
 func Test_write_val_map(t *testing.T) {
diff --git a/jsoniter_must_be_valid_test.go b/jsoniter_must_be_valid_test.go
new file mode 100644
index 0000000..01c6e44
--- /dev/null
+++ b/jsoniter_must_be_valid_test.go
@@ -0,0 +1,71 @@
+package jsoniter
+
+import (
+	"testing"
+
+	"github.com/json-iterator/go/require"
+)
+
+// if must be valid is useless, just drop this test
+func Test_must_be_valid(t *testing.T) {
+	should := require.New(t)
+	any := Get([]byte("123"))
+	should.Equal(any.MustBeValid().ToInt(), 123)
+
+	any = Wrap(int8(10))
+	should.Equal(any.MustBeValid().ToInt(), 10)
+
+	any = Wrap(int16(10))
+	should.Equal(any.MustBeValid().ToInt(), 10)
+
+	any = Wrap(int32(10))
+	should.Equal(any.MustBeValid().ToInt(), 10)
+
+	any = Wrap(int64(10))
+	should.Equal(any.MustBeValid().ToInt(), 10)
+
+	any = Wrap(uint(10))
+	should.Equal(any.MustBeValid().ToInt(), 10)
+
+	any = Wrap(uint8(10))
+	should.Equal(any.MustBeValid().ToInt(), 10)
+
+	any = Wrap(uint16(10))
+	should.Equal(any.MustBeValid().ToInt(), 10)
+
+	any = Wrap(uint32(10))
+	should.Equal(any.MustBeValid().ToInt(), 10)
+
+	any = Wrap(uint64(10))
+	should.Equal(any.MustBeValid().ToInt(), 10)
+
+	any = Wrap(float32(10))
+	should.Equal(any.MustBeValid().ToFloat64(), float64(10))
+
+	any = Wrap(float64(10))
+	should.Equal(any.MustBeValid().ToFloat64(), float64(10))
+
+	any = Wrap(true)
+	should.Equal(any.MustBeValid().ToFloat64(), float64(1))
+
+	any = Wrap(false)
+	should.Equal(any.MustBeValid().ToFloat64(), float64(0))
+
+	any = Wrap(nil)
+	should.Equal(any.MustBeValid().ToFloat64(), float64(0))
+
+	any = Wrap(struct{ age int }{age: 1})
+	should.Equal(any.MustBeValid().ToFloat64(), float64(0))
+
+	any = Wrap(map[string]interface{}{"abc": 1})
+	should.Equal(any.MustBeValid().ToFloat64(), float64(0))
+
+	any = Wrap("abc")
+	should.Equal(any.MustBeValid().ToFloat64(), float64(0))
+
+	any = Wrap([]int{})
+	should.Equal(any.MustBeValid().ToFloat64(), float64(0))
+
+	any = Wrap([]int{1, 2})
+	should.Equal(any.MustBeValid().ToFloat64(), float64(1))
+}
diff --git a/jsoniter_object_test.go b/jsoniter_object_test.go
index c2f9083..b69f0bf 100644
--- a/jsoniter_object_test.go
+++ b/jsoniter_object_test.go
@@ -34,6 +34,7 @@ func Test_one_field(t *testing.T) {
 		should.Equal("a", field)
 		return true
 	}))
+
 }
 
 func Test_two_field(t *testing.T) {
@@ -70,6 +71,11 @@ func Test_object_wrapper_any_get_all(t *testing.T) {
 	}
 	any := Wrap(TestObject{[]int{1, 2}, []int{3, 4}})
 	should.Contains(any.Get('*', 0).ToString(), `"Field2":3`)
+	should.Contains(any.Keys(), "Field1")
+	should.Contains(any.Keys(), "Field2")
+	should.NotContains(any.Keys(), "Field3")
+
+	//should.Contains(any.GetObject()["Field1"].GetArray()[0], 1)
 }
 
 func Test_write_object(t *testing.T) {