Add projects

backend/internal/util/claude_attribution_test.go

@@ -0,0 +1,94 @@
+package util
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/tidwall/gjson"
+)
+
+func TestIsClaudeCodeAttributionSystemText(t *testing.T) {
+	tests := []struct {
+		name string
+		text string
+		want bool
+	}{
+		{
+			name: "Claude Code attribution block",
+			text: "x-anthropic-billing-header: cc_version=2.1.63.abc; cc_entrypoint=cli; cch=12345;",
+			want: true,
+		},
+		{
+			name: "leading whitespace",
+			text: "\n\t x-anthropic-billing-header: cc_version=2.1.63.abc; cch=12345;",
+			want: true,
+		},
+		{
+			name: "regular system prompt",
+			text: "You are helpful.",
+			want: false,
+		},
+		{
+			name: "empty text",
+			text: "",
+			want: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := IsClaudeCodeAttributionSystemText(tt.text); got != tt.want {
+				t.Fatalf("IsClaudeCodeAttributionSystemText(%q) = %v, want %v", tt.text, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestStripClaudeCodeAttributionSystem(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name        string
+		body        string
+		wantSystem  string
+		wantPresent bool
+	}{
+		{
+			name: "string attribution deleted",
+			body: `{"system":"x-anthropic-billing-header: cc_version=2.1.220; cch=abcde;","messages":[]}`,
+		},
+		{
+			name:        "string regular prompt kept",
+			body:        `{"system":"You are helpful.","messages":[]}`,
+			wantSystem:  `"You are helpful."`,
+			wantPresent: true,
+		},
+		{
+			name:        "array drops billing keeps identity",
+			body:        `{"system":[{"type":"text","text":"x-anthropic-billing-header: cc_version=2.1.220; cch=abcde;"},{"type":"text","text":"You are Claude Code"}],"messages":[]}`,
+			wantSystem:  `[{"type":"text","text":"You are Claude Code"}]`,
+			wantPresent: true,
+		},
+		{
+			name: "array only billing deleted",
+			body: `{"system":[{"type":"text","text":"x-anthropic-billing-header: cc_version=2.1.220; cch=abcde;"}],"messages":[]}`,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			got := StripClaudeCodeAttributionSystem([]byte(tt.body))
+			system := gjson.GetBytes(got, "system")
+			if system.Exists() != tt.wantPresent {
+				t.Fatalf("system exists = %v, want %v: %s", system.Exists(), tt.wantPresent, got)
+			}
+			if tt.wantPresent && system.Raw != tt.wantSystem {
+				t.Fatalf("system = %s, want %s", system.Raw, tt.wantSystem)
+			}
+			if strings.Contains(string(got), "cch=") {
+				t.Fatalf("stripped body still contains cch=: %s", got)
+			}
+		})
+	}
+}