deps: Remove github.com/nsf/jsondiff (#235)

It was only being used in one unit test and go-cmp can support something good enough for our purposes via a transformer.

go.mod

@@ -10,7 +10,6 @@ require (
 	github.com/hashicorp/terraform-plugin-log v0.7.0
 	github.com/hashicorp/terraform-registry-address v0.0.0-20220623143253-7d51757b572c
 	github.com/mitchellh/go-testing-interface v1.14.1
-	github.com/nsf/jsondiff v0.0.0-20200515183724-f29ed568f4ce
 	github.com/vmihailenco/msgpack/v4 v4.3.12
 	google.golang.org/grpc v1.50.1
 	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.2.0

go.sum

@@ -66,8 +66,6 @@ github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9
 github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
 github.com/mitchellh/go-testing-interface v1.14.1 h1:jrgshOhYAUVNMAJiKbEu7EqAwgJJ2JqpQmpLJOu07cU=
 github.com/mitchellh/go-testing-interface v1.14.1/go.mod h1:gfgS7OtZj6MA4U1UrDRp04twqAjfvlZyCfX3sDjEym8=
-github.com/nsf/jsondiff v0.0.0-20200515183724-f29ed568f4ce h1:RPclfga2SEJmgMmz2k+Mg7cowZ8yv4Trqw9UsJby758=
-github.com/nsf/jsondiff v0.0.0-20200515183724-f29ed568f4ce/go.mod h1:uFMI8w+ref4v2r9jz+c9i1IfIttS/OkmLfrk1jne5hs=
 github.com/oklog/run v1.0.0 h1:Ru7dDtJNOyC66gQ5dQmaCa0qIsAUFY3sFpK1Xk8igrw=
 github.com/oklog/run v1.0.0/go.mod h1:dlhp/R75TPv97u0XWUtDeV/lRKWPKSdTuV0TZvrmrQA=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

tftypes/type_json_test.go

@@ -1,10 +1,24 @@
 package tftypes
 
 import (
+	"encoding/json"
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-	"github.com/nsf/jsondiff"
+)
+
+// Reference: https://github.com/google/go-cmp/issues/224
+var cmpTransformJSON = cmp.FilterValues(
+	func(x, y []byte) bool {
+		return json.Valid(x) && json.Valid(y)
+	},
+	cmp.Transformer("ParseJSON", func(in []byte) (out interface{}) {
+		if err := json.Unmarshal(in, &out); err != nil {
+			panic(err) // should never occur given previous filter to ensure valid JSON
+		}
+
+		return out
+	}),
 )
 
 func TestTypeJSON(t *testing.T) {
@@ -138,7 +152,7 @@ func TestTypeJSON(t *testing.T) {
 			}},
 		},
 	}
-	jsondiffopts := jsondiff.DefaultConsoleOptions()
+
 	for name, test := range testCases {
 		name, test := name, test
 		t.Run(name, func(t *testing.T) {
@@ -150,13 +164,13 @@ func TestTypeJSON(t *testing.T) {
 				t.Fatalf("Unexpected parsing results (-wanted +got): %s", cmp.Diff(test.typ, typ))
 			}
 
-			json, err := typ.MarshalJSON()
+			typJSON, err := typ.MarshalJSON()
 			if err != nil {
 				t.Fatalf("unexpected error generating JSON: %s", err)
 			}
-			diff, diffStr := jsondiff.Compare([]byte(test.json), json, &jsondiffopts)
-			if diff != jsondiff.FullMatch {
-				t.Fatalf("unexpected JSON generating results (got => expected): %s", diffStr)
+
+			if diff := cmp.Diff([]byte(test.json), typJSON, cmpTransformJSON); diff != "" {
+				t.Fatalf("unexpected generated JSON difference: %s", diff)
 			}
 		})
 	}