Moving federation tests to their own folders

Reorganizing the tests in the federation plugin a little bit so make it simpler to add more safely without testdata colliding. This is in anticipation for a follow up PR for adding entity resolver tests.

Run the tests with `go test ./plugin/federation/...` and verify they all pass. Also verify that the testdata/allthething directory has a `generated` directory specific to that test.

NOTE: There is a catch all type of test that I moved to the directory `allthething`.  Open to suggestions for a better name! One potential thing to considere here is to split up the tests that use that testdata and break them down into more specific tests. E.g. Add a multikey test in the testdata/entity.  For now, Im leaving that as a TODO.

plugin/federation/federation_test.go

@@ -8,7 +8,7 @@ import (
 )
 
 func TestWithEntities(t *testing.T) {
-	f, cfg := load(t, "test_data/gqlgen.yml")
+	f, cfg := load(t, "testdata/allthethings/gqlgen.yml")
 
 	require.Equal(t, []string{"ExternalExtension", "Hello", "MoreNesting", "NestedKey", "VeryNestedKey", "World"}, cfg.Schema.Types["_Entity"].Types)
 
@@ -70,10 +70,11 @@ func TestWithEntities(t *testing.T) {
 }
 
 func TestNoEntities(t *testing.T) {
-	f, cfg := load(t, "test_data/nokey.yml")
+	f, cfg := load(t, "testdata/entities/nokey.yml")
 
 	err := f.MutateConfig(cfg)
 	require.NoError(t, err)
+	require.Len(t, f.Entities, 0)
 }
 
 func load(t *testing.T, name string) (*federation, *config.Config) {

plugin/federation/testdata/allthethings/gqlgen.yml

@@ -0,0 +1,9 @@
+schema:
+  - "testdata/allthethings/schema.graphql"
+exec:
+  filename: testdata/allthethings/generated/exec.go
+federation:
+  filename: testdata/allthethings/generated/federation.go
+
+autobind:
+  - "github.com/99designs/gqlgen/plugin/federation/testdata/allthethings/model"

plugin/federation/testdata/allthethings/model/federation.go

@@ -0,0 +1,48 @@
+package model
+
+type _FieldSet string //nolint:deadcode,unused
+
+type Hello struct {
+	Name      string
+	Secondary string
+}
+
+func (Hello) IsEntity() {}
+
+type World struct {
+	Foo string
+	Bar int
+}
+
+func (World) IsEntity() {}
+
+type ExternalExtension struct {
+	UPC     string
+	Reviews []*World
+}
+
+func (ExternalExtension) IsEntity() {}
+
+type NestedKey struct {
+	ID    string
+	Hello *Hello
+}
+
+func (NestedKey) IsEntity() {}
+
+type MoreNesting struct {
+	ID    string
+	World *World
+}
+
+func (MoreNesting) IsEntity() {}
+
+type VeryNestedKey struct {
+	ID     string
+	Hello  *Hello
+	World  *World
+	Nested *NestedKey
+	More   *MoreNesting
+}
+
+func (VeryNestedKey) IsEntity() {}

plugin/federation/testdata/entities/nokey.yml

@@ -0,0 +1,6 @@
+schema:
+  - "testdata/entities/nokey.graphql"
+exec:
+  filename: testdata/entities/generated/exec.go
+federation:
+  filename: testdata/entities/generated/federation.go