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diff --git a/tests/model.h b/tests/model.h
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+#ifndef WSAP_TERM_MODEL_H
+#define WSAP_TERM_MODEL_H
+
+/*
+ * A slow reference model of the terminal. It defines correct behavior for
+ * the input that tests/term/fuzz_gen.h makes. model.c names its sources:
+ * xterm and ECMA-48 for controls, Unicode for UTF-8, and this terminal's
+ * own design where xterm has no rule (reflow, history, clusters).
+ *
+ * The model reads nothing from the terminal. Tests compare the two through
+ * the public API only.
+ */
+
+#include "term/term.h"
+#include "term/unicode/grapheme.h"
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+struct model_cell {
+    uint32_t cp[GRAPHEME_MAX_LEN];
+    uint8_t n;          /* code points; 0 for the right half of a wide cell */
+    uint8_t width;      /* 1, 2 for a wide cell, 0 for its right half */
+    uint16_t attrs;     /* TERM_ATTR_* */
+    term_color fg, bg;
+};
+
+struct model;
+
+/* history is the history limit, as in term_options.scrollback. */
+struct model *model_new(struct term_vector2i size, int history);
+void model_free(struct model *m);
+void model_feed(struct model *m, const char *s, size_t len, unsigned flags);
+bool model_resize(struct model *m, struct term_vector2i size);
+
+struct term_vector2i model_size(const struct model *m);
+/* History rows. The alternate screen shows no history, so it reports 0. */
+int model_history(const struct model *m);
+/* Row 0 is the oldest history row. Row model_history() is the top screen
+ * row. Return NULL for an invalid row. Different rows can be read together.
+ * A feed or resize ends the lifetime of returned row data. */
+const struct model_cell *model_row(const struct model *m, int row);
+struct term_cursor model_cursor(const struct model *m);
+struct term_modes model_modes(const struct model *m);
+/* Replies since the last model_take_replies(). */
+const char *model_replies(const struct model *m, size_t *len);
+void model_take_replies(struct model *m);
+
+#endif