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server/internal/api/handlers/agent_test.go

@@ -0,0 +1,24 @@
+package handlers
+
+import "testing"
+
+func TestValidPairCode(t *testing.T) {
+	tests := []struct {
+		name string
+		code string
+		want bool
+	}{
+		{name: "valid", code: "AB23CD", want: true},
+		{name: "ambiguous characters rejected", code: "AB01CD", want: false},
+		{name: "lowercase rejected before normalization", code: "ab12cd", want: false},
+		{name: "wrong length", code: "AB12C", want: false},
+		{name: "unicode rejected", code: "ＡB12CD", want: false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := validPairCode(tt.code); got != tt.want {
+				t.Fatalf("validPairCode(%q) = %v, want %v", tt.code, got, tt.want)
+			}
+		})
+	}
+}