1 files changed, 24 insertions, 0 deletions
diff --git a/commands/msgview/save_test.go b/commands/msgview/save_test.go
new file mode 100644
index 00000000..d6b7e757
--- /dev/null
+++ b/commands/msgview/save_test.go
@@ -0,0 +1,24 @@
+package msgview
+
+import "testing"
+
+func TestGetCollisionlessFilename(t *testing.T) {
+	tests := []struct {
+		originalFilename string
+		expectedNewName  string
+		existingFiles    map[string]struct{}
+	}{
+		{"test", "test", map[string]struct{}{}},
+		{"test", "test", map[string]struct{}{"other-file": {}}},
+		{"test.txt", "test.txt", map[string]struct{}{"test.log": {}}},
+		{"test.txt", "test_1.txt", map[string]struct{}{"test.txt": {}}},
+		{"test.txt", "test_2.txt", map[string]struct{}{"test.txt": {}, "test_1.txt": {}}},
+		{"test.txt", "test_1.txt", map[string]struct{}{"test.txt": {}, "test_2.txt": {}}},
+	}
+	for _, tt := range tests {
+		actual := getCollisionlessFilename(tt.originalFilename, tt.existingFiles)
+		if actual != tt.expectedNewName {
+			t.Errorf("expected %s, actual %s", tt.expectedNewName, actual)
+		}
+	}
+}