jsonmatch: fix destructuring of Array

2 files changed, 20 insertions, 1 deletions

diff --git a/jsonmatch/diff_test.go b/jsonmatch/diff_test.go
index f0f4fdd..a59d304 100644
--- a/jsonmatch/diff_test.go
+++ b/jsonmatch/diff_test.go
@@ -56,7 +56,7 @@ func TestCanonicalizesActualPayload(t *testing.T) {
 			"data": jsonmatch.Object{
 				"foo": 42,
 				"bar": "hello world",
-				"qux": []any{5, nil, 15},
+				"qux": jsonmatch.Array{5, nil, 15},
 			},
 		}
 		AssertEqual(t, match.DiffAgainst(message), nil)
@@ -390,3 +390,20 @@ type unmarshalableObject struct{}
 func (unmarshalableObject) MarshalJSON() ([]byte, error) {
 	return nil, errors.New("this object is unmarshalable")
 }
+
+func TestArrayOnArrayAction(t *testing.T) {
+	message := []byte(`[[1,3]]`) // but we assert against [[1,2]]
+	expected := []jsonmatch.Diff{{
+		Kind:         "value mismatch",
+		Pointer:      "/0/1",
+		ExpectedJSON: "2",
+		ActualJSON:   "3",
+	}}
+
+	match := jsonmatch.Array{[]any{1, 2}}
+	AssertEqual(t, match.DiffAgainst(message), expected)
+
+	// this used to fail before the fix in the commit that added this test
+	match = jsonmatch.Array{jsonmatch.Array{1, 2}}
+	AssertEqual(t, match.DiffAgainst(message), expected)
+}
diff --git a/jsonmatch/machinery.go b/jsonmatch/machinery.go
index 172c82a..7f91f67 100644
--- a/jsonmatch/machinery.go
+++ b/jsonmatch/machinery.go
@@ -130,6 +130,8 @@ func getDiffsForValue(path []pathElement, expected, actual any) []Diff {
 		return getDiffsForObject(path, expected, actual)
 	case []any:
 		return getDiffsForArray(path, expected, actual)
+	case Array:
+		return getDiffsForArray(path, expected, actual)
 	case []map[string]any:
 		downcasted := make([]any, len(expected))
 		for idx, val := range expected {