1 files changed, 44 insertions, 0 deletions
diff --git a/lib/converter_test.go b/lib/converter_test.go
new file mode 100644
index 00000000..9c92a569
--- /dev/null
+++ b/lib/converter_test.go
@@ -0,0 +1,44 @@
+package lib
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestRegisterInputConverter(t *testing.T) {
+	resetInputConverters()
+	if err := RegisterInputConverter("json", mockInputConverter{typ: "json", action: ActionAdd}); err != nil {
+		t.Fatalf("RegisterInputConverter() error = %v", err)
+	}
+	if err := RegisterInputConverter("json", mockInputConverter{}); err != ErrDuplicatedConverter {
+		t.Fatalf("expected ErrDuplicatedConverter, got %v", err)
+	}
+}
+
+func TestRegisterOutputConverter(t *testing.T) {
+	resetOutputConverters()
+	if err := RegisterOutputConverter("txt", mockOutputConverter{typ: "txt", action: ActionOutput}); err != nil {
+		t.Fatalf("RegisterOutputConverter() error = %v", err)
+	}
+	if err := RegisterOutputConverter("txt", mockOutputConverter{}); err != ErrDuplicatedConverter {
+		t.Fatalf("expected ErrDuplicatedConverter, got %v", err)
+	}
+}
+
+func TestListConverters(t *testing.T) {
+	resetInputConverters()
+	resetOutputConverters()
+
+	_ = RegisterInputConverter("b", mockInputConverter{typ: "b", desc: "second"})
+	_ = RegisterInputConverter("a", mockInputConverter{typ: "a", desc: "first"})
+	_ = RegisterOutputConverter("x", mockOutputConverter{typ: "x", desc: "out"})
+
+	out := captureOutput(t, func() {
+		ListInputConverter()
+		ListOutputConverter()
+	})
+
+	if !strings.Contains(out, "a") || !strings.Contains(out, "b") || !strings.Contains(out, "x") {
+		t.Fatalf("unexpected output: %s", out)
+	}
+}