[MM-25268] Implement prefix/suffix searching on teams and channel page in system console (#14698)

* Implement prefix/suffix search on teams page

* Make Channel Page prefix/suffix search as well

* address PR comments

* add tests

* fix styling

* take postgres into account

* add more api tests

* update test

* add team store test

* write store test for team and channel

* fix lint

* update description

* revert go mod

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

api4/channel_test.go

@@ -1152,11 +1152,91 @@ func TestSearchAllChannels(t *testing.T) {
 	defer th.TearDown()
 	Client := th.Client
 
-	search := &model.ChannelSearch{Term: th.BasicChannel.Name}
+	channel := &model.Channel{
+		DisplayName: "FOOBAR",
+		Name:        "whatever",
+		Type:        model.CHANNEL_OPEN,
+		TeamId:      th.BasicTeam.Id,
+	}
+
+	// Testing Mixed Case (Ensure we get results for partial word searches)
+
+	// Search by using display name
+	foobarchannel, err := th.SystemAdminClient.CreateChannel(channel)
+	CheckNoError(t, err)
+
+	search := &model.ChannelSearch{Term: "oob"}
 
 	channels, resp := th.SystemAdminClient.SearchAllChannels(search)
 	CheckNoError(t, resp)
 
+	assert.Len(t, *channels, 1)
+	assert.Equal(t, foobarchannel.Id, (*channels)[0].Id)
+
+	search = &model.ChannelSearch{Term: "foo"}
+
+	channels, resp = th.SystemAdminClient.SearchAllChannels(search)
+	CheckNoError(t, resp)
+
+	assert.Len(t, *channels, 1)
+	assert.Equal(t, foobarchannel.Id, (*channels)[0].Id)
+
+	search = &model.ChannelSearch{Term: "bar"}
+
+	channels, resp = th.SystemAdminClient.SearchAllChannels(search)
+	CheckNoError(t, resp)
+
+	assert.Len(t, *channels, 1)
+	assert.Equal(t, foobarchannel.Id, (*channels)[0].Id)
+
+	// Search by using Name
+	search = &model.ChannelSearch{Term: "what"}
+
+	channels, resp = th.SystemAdminClient.SearchAllChannels(search)
+	CheckNoError(t, resp)
+
+	assert.Len(t, *channels, 1)
+	assert.Equal(t, foobarchannel.Id, (*channels)[0].Id)
+
+	search = &model.ChannelSearch{Term: "ever"}
+
+	channels, resp = th.SystemAdminClient.SearchAllChannels(search)
+	CheckNoError(t, resp)
+
+	// Seach by partial word search and testing case sensitivty
+	assert.Len(t, *channels, 1)
+	assert.Equal(t, foobarchannel.Id, (*channels)[0].Id)
+
+	search = &model.ChannelSearch{Term: th.BasicChannel.Name[2:14]}
+
+	channels, resp = th.SystemAdminClient.SearchAllChannels(search)
+	CheckNoError(t, resp)
+
+	assert.Len(t, *channels, 1)
+	assert.Equal(t, th.BasicChannel.Id, (*channels)[0].Id)
+
+	search = &model.ChannelSearch{Term: strings.ToUpper(th.BasicChannel.Name)}
+
+	channels, resp = th.SystemAdminClient.SearchAllChannels(search)
+	CheckNoError(t, resp)
+
+	assert.Len(t, *channels, 1)
+	assert.Equal(t, th.BasicChannel.Id, (*channels)[0].Id)
+
+	search = &model.ChannelSearch{Term: th.BasicChannel.Name[0:2] + strings.ToUpper(th.BasicChannel.Name[2:5]) + th.BasicChannel.Name[5:]}
+
+	channels, resp = th.SystemAdminClient.SearchAllChannels(search)
+	CheckNoError(t, resp)
+
+	assert.Len(t, *channels, 1)
+	assert.Equal(t, th.BasicChannel.Id, (*channels)[0].Id)
+
+	// Testing Non-Mixed Case test cases
+	search = &model.ChannelSearch{Term: th.BasicChannel.Name}
+
+	channels, resp = th.SystemAdminClient.SearchAllChannels(search)
+	CheckNoError(t, resp)
+
 	assert.Len(t, *channels, 1)
 	assert.Equal(t, th.BasicChannel.Id, (*channels)[0].Id)