Add a test for aliasing different cases

fixes #376

codegen/testserver/gqlgen.yml

@@ -1,4 +1,5 @@
-schema: schema.graphql
+schema:
+  - "*.graphql"
 
 exec:
   filename: generated.go
@@ -43,4 +44,9 @@ models:
   Keywords:
     fields:
       _: { fieldName: Underscore }
-
+  ValidInput:
+    fields:
+      _: { fieldName: Underscore }
+  ValidType:
+    fields:
+      different_case: { fieldName: DifferentCaseOld }

codegen/testserver/resolver.go

@@ -59,9 +59,6 @@ func (r *queryResolver) NestedInputs(ctx context.Context, input [][]*OuterInput)
 func (r *queryResolver) NestedOutputs(ctx context.Context) ([][]*OuterObject, error) {
 	panic("not implemented")
 }
-func (r *queryResolver) Keywords(ctx context.Context, input *Keywords) (bool, error) {
-	panic("not implemented")
-}
 func (r *queryResolver) Shapes(ctx context.Context) ([]Shape, error) {
 	panic("not implemented")
 }
@@ -98,7 +95,7 @@ func (r *queryResolver) InputSlice(ctx context.Context, arg []string) (bool, err
 func (r *queryResolver) ShapeUnion(ctx context.Context) (ShapeUnion, error) {
 	panic("not implemented")
 }
-func (r *queryResolver) KeywordArgs(ctx context.Context, breakArg string, defaultArg string, funcArg string, interfaceArg string, selectArg string, caseArg string, deferArg string, goArg string, mapArg string, structArg string, chanArg string, elseArg string, gotoArg string, packageArg string, switchArg string, constArg string, fallthroughArg string, ifArg string, rangeArg string, typeArg string, continueArg string, forArg string, importArg string, returnArg string, varArg string, _Arg string) (bool, error) {
+func (r *queryResolver) ValidType(ctx context.Context) (*ValidType, error) {
 	panic("not implemented")
 }
 

codegen/testserver/schema.graphql

@@ -5,7 +5,6 @@ type Query {
     recursive(input: RecursiveInputSlice): Boolean
     nestedInputs(input: [[OuterInput]] = [[{inner: {id: 1}}]]): Boolean
     nestedOutputs: [[OuterObject]]
-    keywords(input: Keywords): Boolean!
     shapes: [Shape]
     errorBubble: Error
     modelMethods: ModelMethods
@@ -91,66 +90,6 @@ type InnerObject {
     id: Int!
 }
 
-input Keywords {
-    break:       String!
-    default:     String!
-    func:        String!
-    interface:   String!
-    select:      String!
-    case:        String!
-    defer:       String!
-    go:          String!
-    map:         String!
-    struct:      String!
-    chan:        String!
-    else:        String!
-    goto:        String!
-    package:     String!
-    switch:      String!
-    const:       String!
-    fallthrough: String!
-    if:          String!
-    range:       String!
-    type:        String!
-    continue:    String!
-    for:         String!
-    import:      String!
-    return:      String!
-    var:         String!
-    _:           String!
-}
-
-extend type Query {
-    keywordArgs(
-        break:       String!,
-        default:     String!,
-        func:        String!,
-        interface:   String!,
-        select:      String!,
-        case:        String!,
-        defer:       String!,
-        go:          String!,
-        map:         String!,
-        struct:      String!,
-        chan:        String!,
-        else:        String!,
-        goto:        String!,
-        package:     String!,
-        switch:      String!,
-        const:       String!,
-        fallthrough: String!,
-        if:          String!,
-        range:       String!,
-        type:        String!,
-        continue:    String!,
-        for:         String!,
-        import:      String!,
-        return:      String!,
-        var:         String!,
-        _:           String!,
-    ): Boolean!
-}
-
 interface Shape {
     area: Float
 }

codegen/testserver/validtypes.graphql

@@ -0,0 +1,68 @@
+extend type Query {
+    validType: ValidType
+}
+
+""" These things are all valid, but without care generate invalid go code """
+type ValidType {
+    differentCase: String!
+    different_case: String!
+    validInputKeywords(input: ValidInput): Boolean!
+    validArgs(
+        break:       String!,
+        default:     String!,
+        func:        String!,
+        interface:   String!,
+        select:      String!,
+        case:        String!,
+        defer:       String!,
+        go:          String!,
+        map:         String!,
+        struct:      String!,
+        chan:        String!,
+        else:        String!,
+        goto:        String!,
+        package:     String!,
+        switch:      String!,
+        const:       String!,
+        fallthrough: String!,
+        if:          String!,
+        range:       String!,
+        type:        String!,
+        continue:    String!,
+        for:         String!,
+        import:      String!,
+        return:      String!,
+        var:         String!,
+        _:           String!,
+    ): Boolean!
+}
+
+input ValidInput {
+    break:       String!
+    default:     String!
+    func:        String!
+    interface:   String!
+    select:      String!
+    case:        String!
+    defer:       String!
+    go:          String!
+    map:         String!
+    struct:      String!
+    chan:        String!
+    else:        String!
+    goto:        String!
+    package:     String!
+    switch:      String!
+    const:       String!
+    fallthrough: String!
+    if:          String!
+    range:       String!
+    type:        String!
+    continue:    String!
+    for:         String!
+    import:      String!
+    return:      String!
+    var:         String!
+    _:           String!
+}
+

codegen/testserver/validtypes_test.go

@@ -0,0 +1,38 @@
+package testserver
+
+import (
+	"context"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/99designs/gqlgen/client"
+	"github.com/99designs/gqlgen/handler"
+	"github.com/stretchr/testify/require"
+)
+
+func TestValidType(t *testing.T) {
+	resolvers := &Stub{}
+	resolvers.QueryResolver.ValidType = func(ctx context.Context) (validType *ValidType, e error) {
+		return &ValidType{
+			DifferentCase:    "new",
+			DifferentCaseOld: "old",
+		}, nil
+	}
+
+	srv := httptest.NewServer(handler.GraphQL(NewExecutableSchema(Config{Resolvers: resolvers})))
+	c := client.New(srv.URL)
+
+	t.Run("fields with differing cases can be distinguished", func(t *testing.T) {
+		var resp struct {
+			ValidType struct {
+				New string `json:"differentCase"`
+				Old string `json:"different_case"`
+			}
+		}
+		err := c.Post(`query { validType { differentCase, different_case } }`, &resp)
+		require.NoError(t, err)
+
+		require.Equal(t, "new", resp.ValidType.New)
+		require.Equal(t, "old", resp.ValidType.Old)
+	})
+}