refactor and unit test filters

server/ajax/task_test.go

@@ -2,6 +2,7 @@ package ajax
 
 import (
 	"encoding/json"
+	"local/todo-server/server/ajax/form"
 	"local/todo-server/server/ajax/task"
 	"net/http"
 	"net/http/httptest"
@@ -207,3 +208,48 @@ func TestAjaxChangeOrder(t *testing.T) {
 		t.Error(tasks[2])
 	}
 }
+
+func TestFilterComplete(t *testing.T) {
+	task := &task.Task{Complete: false}
+	cases := []struct {
+		query string
+		out   bool
+	}{
+		{query: "", out: true},
+		{query: "0", out: true},
+		{query: "1", out: false},
+	}
+
+	for name, c := range cases {
+		out := filterComplete(c.query)
+		if out(task) != c.out {
+			t.Errorf("[%d] want %v, got %v", name, c.out, out(task))
+		}
+	}
+}
+
+func TestFilterTags(t *testing.T) {
+	cases := map[string]struct {
+		query string
+		tags  []string
+		out   bool
+	}{
+		"no filter":                    {query: "", out: true},
+		"single matching filter":       {query: "a", out: true, tags: []string{"a"}},
+		"single non-matching filter":   {query: "a", out: false, tags: []string{"b"}},
+		"duo matching filter":          {query: "a, b", out: true, tags: []string{"b", "a"}},
+		"duo partial-matching filter":  {query: "a, c", out: false, tags: []string{"b", "a"}},
+		"duo non-matching filter":      {query: "a, c", out: false, tags: []string{"d", "e"}},
+		"trio matching filter":         {query: "a, b, c", out: true, tags: []string{"b", "a", "c", "d", "e"}},
+		"trio partial-matching filter": {query: "a, c, d", out: false, tags: []string{"b", "a", "d"}},
+		"trio non-matching filter":     {query: "a, b, c", out: false, tags: []string{"x", "y", "z"}},
+	}
+
+	for name, c := range cases {
+		task := &task.Task{Tags: c.tags}
+		out := filterTags(form.ToStrArr(c.query))
+		if v := out(task); v != c.out {
+			t.Errorf("[%s] want %v, got %v", name, c.out, v)
+		}
+	}
+}