Change process-to-container from Map to Renderer

This allows us to be more efficient when collating the data.

render/container_test.go

@@ -2,7 +2,6 @@ package render_test
 
 import (
 	"context"
-	"fmt"
 	"testing"
 
 	"github.com/weaveworks/common/test"
@@ -25,32 +24,6 @@ var (
 	})
 )
 
-func TestMapProcess2Container(t *testing.T) {
-	for _, input := range []testcase{
-		{"empty", report.MakeNode("empty"), true},
-		{"basic process", report.MakeNodeWith("basic", map[string]string{report.PID: "201", report.DockerContainerID: "a1b2c3"}), true},
-		{"uncontained", report.MakeNodeWith("uncontained", map[string]string{report.PID: "201", report.HostNodeID: report.MakeHostNodeID("foo")}), true},
-	} {
-		testMap(t, render.MapProcess2Container, input)
-	}
-}
-
-type testcase struct {
-	name string
-	n    report.Node
-	ok   bool
-}
-
-func testMap(t *testing.T, f render.MapFunc, input testcase) {
-	if have := f(input.n); input.ok != (have.ID != "") {
-		name := input.name
-		if name == "" {
-			name = fmt.Sprintf("%v", input.n)
-		}
-		t.Errorf("%s: want %v, have %v", name, input.ok, have)
-	}
-}
-
 func TestContainerRenderer(t *testing.T) {
 	have := utils.Prune(render.ContainerWithImageNameRenderer.Render(context.Background(), fixture.Report).Nodes)
 	want := utils.Prune(expected.RenderedContainers)