diff --git a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/DeviceKvStoreCallbackJsunit.test.js b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/DeviceKvStoreCallbackJsunit.test.js
index 88d1c163c48555b5a5ee1bd9f83e97e60f0fe55b..ea5e7a77ed09e86fb28ef7d3d427e0e043efc86c 100644
--- a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/DeviceKvStoreCallbackJsunit.test.js
+++ b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/DeviceKvStoreCallbackJsunit.test.js
@@ -854,19 +854,21 @@ describe('DeviceKvStoreCallbackTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT + 'testSync101', VALUE_TEST_SYNC_ELEMENT, function (err,data) {
                 console.log('testDeviceKvStoreOnSyncComplete101 put success');
                 expect(err == undefined).assertTrue();
+            }).catch((error) => {
+                console.log('testDeviceKvStoreOnSyncComplete101 put failed:' + e);
+                expect(null).assertFail();
+            });
+            try {
                 var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
                 var mode = factory.SyncMode.PULL_ONLY;
-                try {
-                    kvStore.sync(devices, mode);
-                } catch(e) {
-                    console.log('testDeviceKvStoreOnSyncComplete101 sync no peer device :e:' + e);
-                }
-                done();
-            });
+                kvStore.sync(devices, mode);
+            } catch(e) {
+                console.log('testDeviceKvStoreOnSyncComplete101 sync no peer device :e:' + e);
+            }
         }catch(e) {
             console.log('testDeviceKvStoreOnSyncComplete101 no peer device :e:' + e);
-            done();
         }
+        done();
     })
 
     /**
@@ -883,19 +885,21 @@ describe('DeviceKvStoreCallbackTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT + 'testSync101', VALUE_TEST_SYNC_ELEMENT, function (err,data) {
                 console.log('testDeviceKvStoreOnSyncComplete102 put success');
                 expect(err == undefined).assertTrue();
+            }).catch((error) => {
+                console.log('testDeviceKvStoreOnSyncComplete102 put failed:' + e);
+                expect(null).assertFail();
+            });
+            try {
                 var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
                 var mode = factory.SyncMode.PUSH_ONLY;
-                try {
-                    kvStore.sync(devices, mode);
-                } catch(e) {
-                    console.log('testDeviceKvStoreOnSyncComplete101 sync no peer device :e:' + e);
-                }
-                done();
-            });
+                kvStore.sync(devices, mode);
+            } catch(e) {
+                console.log('testDeviceKvStoreOnSyncComplete102 sync no peer device :e:' + e);
+            }
         }catch(e) {
             console.log('testDeviceKvStoreOnSyncComplete102 no peer device :e:' + e);
-            done();
         }
+        done();
     })
 
     /**
@@ -912,19 +916,21 @@ describe('DeviceKvStoreCallbackTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT + 'testSync101', VALUE_TEST_SYNC_ELEMENT, function (err,data) {
                 console.log('testDeviceKvStoreOnSyncComplete103 put success');
                 expect(err == undefined).assertTrue();
+            }).catch((error) => {
+                console.log('testDeviceKvStoreOnSyncComplete103 put failed:' + e);
+                expect(null).assertFail();
+            });
+            try {
                 var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
                 var mode = factory.SyncMode.PUSH_PULL;
-                try {
-                    kvStore.sync(devices, mode);
-                } catch(e) {
-                    console.log('testDeviceKvStoreOnSyncComplete101 sync no peer device :e:' + e);
-                }
-                done();
-            });
+                kvStore.sync(devices, mode);
+            } catch(e) {
+                console.log('testDeviceKvStoreOnSyncComplete103 sync no peer device :e:' + e);
+            }
         }catch(e) {
             console.log('testDeviceKvStoreOnSyncComplete103 no peer device :e:' + e);
-            done();
         }
+        done();
     })
 
     /**
diff --git a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/DeviceKvStorePromiseJsunit.test.js b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/DeviceKvStorePromiseJsunit.test.js
index 29f13cdef932da7eab2443a23f9f246580529163..2a4b51aff72b71709ba8dd9e951f9d760f0db0f5 100644
--- a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/DeviceKvStorePromiseJsunit.test.js
+++ b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/DeviceKvStorePromiseJsunit.test.js
@@ -860,14 +860,19 @@ describe('DeviceKvStorePromiseTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT, VALUE_TEST_SYNC_ELEMENT).then((data) => {
                 console.log('testDeviceKvStoreOnSyncComplete001 put success');
                 expect(data == undefined).assertTrue();
+            }).catch((error) => {
+                console.log('testDeviceKvStoreOnSyncComplete001 put failed:' + e);
+                expect(null).assertFail();
+            });
+            try {
                 var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
                 var mode = factory.SyncMode.PULL_ONLY;
                 kvStore.sync(devices, mode);
-            }).catch((error) => {
-                console.log('testDeviceKvStoreOnSyncComplete001 no peer device :e:' + error);
-            });
-        }catch(e) {
-            console.log('testDeviceKvStoreOnSyncComplete001 put e ' + e);
+            } catch (e) {
+                console.log('testDeviceKvStoreOnSyncComplete001 sync no peer device :e:' + e);
+            }
+        } catch(e) {
+            console.log('testDeviceKvStoreOnSyncComplete001 e ' + e);
             expect(null).assertFail();
         }
         done();
@@ -887,13 +892,18 @@ describe('DeviceKvStorePromiseTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT, VALUE_TEST_SYNC_ELEMENT).then((data) => {
                 console.log('testDeviceKvStoreOnSyncComplete002 put success');
                 expect(data == undefined).assertTrue();
+            }).catch((error) => {
+                console.log('testDeviceKvStoreOnSyncComplete002 put failed:' + e);
+                expect(null).assertFail();
+            });
+            try {
                 var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
                 var mode = factory.SyncMode.PUSH_ONLY;
                 kvStore.sync(devices, mode);
-            }).catch((error) => {
+            } catch(error) {
                 console.log('testDeviceKvStoreOnSyncComplete002 no peer device :e:' + error);
-            });
-        }catch(e) {
+            };
+        } catch(e) {
             console.log('testDeviceKvStoreOnSyncComplete002 put e ' + e);
             expect(null).assertFail();
         }
@@ -914,13 +924,18 @@ describe('DeviceKvStorePromiseTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT, VALUE_TEST_SYNC_ELEMENT).then((data) => {
                 console.log('testDeviceKvStoreOnSyncComplete003 put success');
                 expect(data == undefined).assertTrue();
+            }).catch((error) => {
+                console.log('testDeviceKvStoreOnSyncComplete002 put failed:' + e);
+                expect(null).assertFail();
+            });
+            try {
                 var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
                 var mode = factory.SyncMode.PUSH_PULL;
                 kvStore.sync(devices, mode);
-            }).catch((error) => {
+            } catch(error) {
                 console.log('testDeviceKvStoreOnSyncComplete003 no peer device :e:' + error);
-            });
-        }catch(e) {
+            };
+        } catch(e) {
             console.log('testDeviceKvStoreOnSyncComplete003 put e ' + e);
             expect(null).assertFail();
         }
diff --git a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SchemaJsunit.test.js b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SchemaJsunit.test.js
index 2c19f8ded76181521ebfcd6dfffb8b7154ecd1fd..af901a6f16c870cbb634b4460ac006aecfc48450 100644
--- a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SchemaJsunit.test.js
+++ b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SchemaJsunit.test.js
@@ -262,4 +262,25 @@ describe('SchemaTest', function() {
         }
         done();
     })
+
+    /**
+     * @tc.number SUB_DISTRIBUTEDDATAMGR_SCHEMA_TOJSONSTRING_0400
+     * @tc.name [JS-API8]Schema.ToJsonString()
+     * @tc.desc Test Js Api Schema.ToJsonString() testcase 004
+     */
+    it('testToJsonString004', 0, async function(done) {
+        try {
+            let english = new ddm.FieldNode('english');
+            english.type = ddm.ValueType.STRING;
+
+            let schema = new ddm.Schema();
+            schema.root.appendChild(english);
+            schema.indexes = [];    // indexex set to empty array.
+            console.log("schema: " + schema.toJsonString());
+        } catch (e) {
+            console.log("schema fail on exception: " + e);
+            expect(null).assertFail();
+        }
+        done();
+    })
 })
\ No newline at end of file
diff --git a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SingleKvStoreCallbackJsunit.test.js b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SingleKvStoreCallbackJsunit.test.js
index 9aa1dc4eeed838afaa832e53a0a416f456920109..9f428a3dfa5f37b4951d891c6f8cfc033cc05092 100755
--- a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SingleKvStoreCallbackJsunit.test.js
+++ b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SingleKvStoreCallbackJsunit.test.js
@@ -821,11 +821,14 @@ describe('SingleKvStoreCallbackTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT + 'testSync101', VALUE_TEST_SYNC_ELEMENT, function (err,data) {
                 console.log('testSingleKvStoreOnSyncComplete101 put success');
                 expect(err == undefined).assertTrue();
+            });
+            try {
                 var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
                 var mode = factory.SyncMode.PULL_ONLY;
                 kvStore.sync(devices, mode, 10);
-                done();
-            });
+            } catch (e) {
+                console.log('testSingleKvStoreOnSyncComplete101 sync no peer device :e:' + e);
+            }
         }catch(e) {
             console.log('testSingleKvStoreOnSyncComplete101 e' + e);
             expect(null).assertFail();
@@ -844,19 +847,22 @@ describe('SingleKvStoreCallbackTest', function () {
                 console.log('testSingleKvStoreOnSyncComplete102 dataChange');
                 expect(data != null).assertTrue();
             });
-            await kvStore.put(KEY_TEST_SYNC_ELEMENT + 'testSync101', VALUE_TEST_SYNC_ELEMENT, function (err,data) {
+            await kvStore.put(KEY_TEST_SYNC_ELEMENT + 'testSync102', VALUE_TEST_SYNC_ELEMENT, function (err,data) {
                 console.log('testSingleKvStoreOnSyncComplete102 put success');
                 expect(err == undefined).assertTrue();
+            });
+            try {
                 var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
                 var mode = factory.SyncMode.PUSH_ONLY;
                 kvStore.sync(devices, mode, 10);
-                done();
-            });
+            } catch (e) {
+                console.log('testSingleKvStoreOnSyncComplete102 sync no peer device :e:' + e);
+            }
         }catch(e) {
             console.log('testSingleKvStoreOnSyncComplete102 e' + e);
             expect(null).assertFail();
-            done();
         }
+        done();
     })
 
     /**
@@ -870,19 +876,22 @@ describe('SingleKvStoreCallbackTest', function () {
                 console.log('testSingleKvStoreOnSyncComplete103 dataChange');
                 expect(data != null).assertTrue();
             });
-            await kvStore.put(KEY_TEST_SYNC_ELEMENT + 'testSync101', VALUE_TEST_SYNC_ELEMENT, function (err,data) {
+            await kvStore.put(KEY_TEST_SYNC_ELEMENT + 'testSync103', VALUE_TEST_SYNC_ELEMENT, function (err,data) {
                 console.log('testSingleKvStoreOnSyncComplete103 put success');
                 expect(err == undefined).assertTrue();
+            });
+            try {
                 var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
                 var mode = factory.SyncMode.PUSH_PULL;
                 kvStore.sync(devices, mode, 10);
-                done();
-            });
+            } catch (e) {
+                console.log('testSingleKvStoreOnSyncComplete103 sync no peer device :e:' + e);
+            }
         }catch(e) {
             console.log('testSingleKvStoreOnSyncComplete103 e' + e);
             expect(null).assertFail();
-            done();
         }
+        done();
     })
 
     /**
diff --git a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SingleKvStorePromiseJsunit.test.js b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SingleKvStorePromiseJsunit.test.js
index a1dd76880f68f09d9c805bf3a7d08cc49e5def8d..68fdfd3312c71192deba39b190592fa9a5a07815 100755
--- a/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SingleKvStorePromiseJsunit.test.js
+++ b/distributeddatamgr/distributeddatamgrjstest/hap/src/main/js/default/test/SingleKvStorePromiseJsunit.test.js
@@ -830,15 +830,19 @@ describe('SingleKvStorePromiseTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT, VALUE_TEST_SYNC_ELEMENT).then((data) => {
                 console.log('testSingleKvStoreOnSyncComplete001 put success');
                 expect(data == undefined).assertTrue();
-                var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
-                var mode = factory.SyncMode.PULL_ONLY;
-                kvStore.sync(devices, mode, 10);
             }).catch((error) => {
                 console.log('testSingleKvStoreOnSyncComplete001 put fail ' + error);
                 expect(null).assertFail();
             });
+            try {
+                var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
+                var mode = factory.SyncMode.PULL_ONLY;
+                kvStore.sync(devices, mode, 10);
+            } catch (e) {
+                console.log('testSingleKvStoreOnSyncComplete001 sync no peer device :e:' + e);
+            }
         }catch(e) {
-            console.log('testSingleKvStoreOnSyncComplete001 put e ' + e);
+            console.log('testSingleKvStoreOnSyncComplete001 e ' + e);
             expect(null).assertFail();
         }
         done();
@@ -858,15 +862,19 @@ describe('SingleKvStorePromiseTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT, VALUE_TEST_SYNC_ELEMENT).then((data) => {
                 console.log('testSingleKvStoreOnSyncComplete002 put success');
                 expect(data == undefined).assertTrue();
-                var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
-                var mode = factory.SyncMode.PUSH_ONLY;
-                kvStore.sync(devices, mode, 10);
             }).catch((error) => {
                 console.log('testSingleKvStoreOnSyncComplete002 put fail ' + error);
                 expect(null).assertFail();
             });
+            try {
+                var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
+                var mode = factory.SyncMode.PUSH_ONLY;
+                kvStore.sync(devices, mode, 10);
+            } catch (e) {
+                console.log('testSingleKvStoreOnSyncComplete002 sync no peer device :e:' + e);
+            }
         }catch(e) {
-            console.log('testSingleKvStoreOnSyncComplete002 put e ' + e);
+            console.log('testSingleKvStoreOnSyncComplete002 e ' + e);
             expect(null).assertFail();
         }
         done();
@@ -886,15 +894,19 @@ describe('SingleKvStorePromiseTest', function () {
             await kvStore.put(KEY_TEST_SYNC_ELEMENT, VALUE_TEST_SYNC_ELEMENT).then((data) => {
                 console.log('testSingleKvStoreOnSyncComplete003 put success');
                 expect(data == undefined).assertTrue();
-                var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
-                var mode = factory.SyncMode.PUSH_PULL;
-                kvStore.sync(devices, mode, 10);
             }).catch((error) => {
                 console.log('testSingleKvStoreOnSyncComplete003 put fail ' + error);
                 expect(null).assertFail();
             });
+            try {
+                var devices = ['A12C1F9261528B21F95778D2FDC0B2E33943E6251AC5487F4473D005758905DB'];
+                var mode = factory.SyncMode.PUSH_PULL;
+                kvStore.sync(devices, mode, 10);
+            } catch (e) {
+                console.log('testSingleKvStoreOnSyncComplete003 sync no peer device :e:' + e);
+            }
         }catch(e) {
-            console.log('testSingleKvStoreOnSyncComplete003 put e ' + e);
+            console.log('testSingleKvStoreOnSyncComplete003 e ' + e);
             expect(null).assertFail();
         }
         done();