set for serverStreamdecorator finished tests

__tests__/callFactories/callDecorators/serverStreamDecorator.js

@@ -49,6 +49,33 @@ describe("server stream decorator tests.", () => {
     });
   });
 
-  describe("tests for set", () => {});
-  describe("tests for send", () => {});
+  describe("tests for set", () => {
+    it("adds a new metadata object", () => {
+      const newMetadata = { meta: "data" };
+      customCall.set(newMetadata);
+      expect(customCall.metadata).toBe(newMetadata);
+    });
+
+    it("does not lose metadata properties", () => {
+      const oldMeta = { old: "old" };
+      const newMeta = { new: "new" };
+      customCall.set(oldMeta);
+      customCall.set(newMeta);
+      expect(customCall.metadata.hasOwnProperty("new")).toBeTruthy();
+    });
+
+    it("metadata object overwrites old properties", () => {
+      const oldMeta = { old: "old" };
+      const newMeta = { old: "new" };
+      customCall.set(oldMeta);
+      customCall.set(newMeta);
+      expect(customCall.metadata.old).toBe("new");
+    });
+  });
+
+  describe("tests for send", () => {
+    it("sends message", () => {});
+
+    it("sends metadata as grpc metadata object", () => {});
+  });
 });

lib/callFactories/callDecorators/serverStreamDecorator.js

@@ -35,7 +35,7 @@ module.exports = function serverStreamDecorator(customCall, originalCall) {
         ...object
       };
     } else {
-      this.metadata;
+      this.metadata = object;
     }
   };