improve: filter as a plugin (#4255)

test/core/plugins/filter/opsFilter.js

@@ -0,0 +1,25 @@
+import { Map } from "immutable"
+import opsFilter from "corePlugins/filter/opsFilter"
+import expect from "expect"
+
+describe("opsFilter", function() {
+  const taggedOps = Map([["pet"], ["store"], ["user"]])
+
+  it("should filter taggedOps by tag name", function () {
+    const filtered = opsFilter(taggedOps, "sto")
+
+    expect(filtered.size).toEqual(1)
+  })
+
+  it("should return all taggedOps when search phrase is empty", function () {
+    const filtered = opsFilter(taggedOps, "")
+
+    expect(filtered.size).toEqual(taggedOps.size)
+  })
+
+  it("should return empty result when there is no match", function () {
+    const filtered = opsFilter(taggedOps, "NoMatch")
+
+    expect(filtered.size).toEqual(0)
+  })
+})