1 files changed, 28 insertions, 0 deletions
diff --git a/gopls/internal/lsp/tests/compare/text_test.go b/gopls/internal/lsp/tests/compare/text_test.go
new file mode 100644
index 000000000..8f5af48bd
--- /dev/null
+++ b/gopls/internal/lsp/tests/compare/text_test.go
@@ -0,0 +1,28 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package compare_test
+
+import (
+	"testing"
+
+	"golang.org/x/tools/gopls/internal/lsp/tests/compare"
+)
+
+func TestText(t *testing.T) {
+	tests := []struct {
+		got, want, wantDiff string
+	}{
+		{"", "", ""},
+		{"equal", "equal", ""},
+		{"a", "b", "--- want\n+++ got\n@@ -1 +1 @@\n-b\n+a\n"},
+		{"a\nd\nc\n", "a\nb\nc\n", "--- want\n+++ got\n@@ -1,4 +1,4 @@\n a\n-b\n+d\n c\n \n"},
+	}
+
+	for _, test := range tests {
+		if gotDiff := compare.Text(test.want, test.got); gotDiff != test.wantDiff {
+			t.Errorf("compare.Text(%q, %q) =\n%q, want\n%q", test.want, test.got, gotDiff, test.wantDiff)
+		}
+	}
+}