1 files changed, 90 insertions, 0 deletions
diff --git a/internal/format/format_test.go b/internal/format/format_test.go
new file mode 100644
index 000000000..04054a7c4
--- /dev/null
+++ b/internal/format/format_test.go
@@ -0,0 +1,90 @@
+package format
+
+import (
+	"testing"
+)
+
+func TestOutputFormat_IsValid(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name   string
+		format OutputFormat
+		want   bool
+	}{
+		{
+			name:   "text format",
+			format: TextFormat,
+			want:   true,
+		},
+		{
+			name:   "json format",
+			format: JSONFormat,
+			want:   true,
+		},
+		{
+			name:   "invalid format",
+			format: "invalid",
+			want:   false,
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			if got := tt.format.IsValid(); got != tt.want {
+				t.Errorf("OutputFormat.IsValid() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestFormatOutput(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name    string
+		content string
+		format  OutputFormat
+		want    string
+		wantErr bool
+	}{
+		{
+			name:    "text format",
+			content: "test content",
+			format:  TextFormat,
+			want:    "test content",
+			wantErr: false,
+		},
+		{
+			name:    "json format",
+			content: "test content",
+			format:  JSONFormat,
+			want:    "{\n  \"response\": \"test content\"\n}",
+			wantErr: false,
+		},
+		{
+			name:    "invalid format",
+			content: "test content",
+			format:  "invalid",
+			want:    "",
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			got, err := FormatOutput(tt.content, tt.format)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("FormatOutput() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("FormatOutput() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}