Test property statuses for cover_assert

Cover properties shouldn't be marked fail when the test failed early due to an assertion.
This should fail without other changes.

tests/statusdb/Makefile

@@ -0,0 +1,2 @@
+SUBDIR=statusdb
+include ../make/subdir.mk

tests/statusdb/mixed.py

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+import json
+import sqlite3
+import sys
+
+def get_prop_type(prop: str):
+    prop = json.loads(prop or "[]")
+    name_parts = prop[-1].split("_")
+    if name_parts[0] == "\check":
+        # read_verilog style
+        # \check_cover_mixed_v...
+        return name_parts[1]
+    else:
+        # verific style
+        # \assert_auto_verificsva_cc...
+        return name_parts[0][1:]
+
+def main():
+    workdir = sys.argv[1]
+    with open(f"{workdir}/status.path", "r") as status_path_file:
+        status_path = f"{workdir}/{status_path_file.read().rstrip()}"
+    # read only database
+    con = sqlite3.connect(f"file:{status_path}?mode=ro", uri=True)
+    db = con.cursor()
+    # custom sql to get all task property statuses for the current workdir
+    rows = db.execute(
+        """
+            SELECT task.id, task_property.name, task_property.src, task_property_status.status
+            FROM task
+            LEFT JOIN task_property ON task_property.task=task.id
+            LEFT JOIN task_property_status ON task_property_status.task_property=task_property.id
+            WHERE task.workdir=:workdir;
+        """,
+        {"workdir": workdir}
+    ).fetchall()
+    # only check the most recent iteration of the test
+    last_id = 0
+    for row_id, _, _, _ in rows:
+        if row_id > last_id:
+            last_id = row_id
+    for row_id, prop, src, status in rows:
+        if row_id != last_id:
+            continue
+        prop_type = get_prop_type(prop)
+        valid_status: list[None|str] = []
+        if workdir in ["mixed_bmc", "mixed_assert"] and prop_type == "assert":
+            valid_status = ["FAIL"]
+        elif workdir == "mixed_bmc" and prop_type == "cover":
+            valid_status = [None, "UNKNOWN"]
+        elif workdir == "mixed_assert" and prop_type == "cover":
+            valid_status = ["PASS", None, "UNKNOWN"]
+        elif workdir == "mixed_no_assert" and prop_type == "assert":
+            valid_status = [None, "UNKNOWN"]
+        elif workdir == "mixed_no_assert" and prop_type == "cover":
+            valid_status = ["PASS"]
+        assert status in valid_status, f"Unexpected {prop_type} status {status} for {prop} ({src})"
+        
+
+if __name__ == "__main__":
+    main()

tests/statusdb/mixed.sby

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+[tasks]
+no_assert cover
+assert cover
+bmc
+
+[options]
+cover: mode cover
+bmc: mode bmc
+bmc: depth 1
+
+assert: cover_assert on
+no_assert: expect pass
+~no_assert: expect fail
+
+[engines]
+cover: smtbmc boolector
+bmc: smtbmc boolector
+
+[script]
+read -formal mixed.v
+prep -top test
+
+[files]
+mixed.v

tests/statusdb/mixed.sh

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+#!/bin/bash
+set -e
+python3 $SBY_MAIN -f $SBY_FILE $TASK
+python3 ${SBY_FILE%.sby}.py $WORKDIR

tests/statusdb/mixed.v

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+module test (input CP, CN, input A, B, output reg XP, XN);
+	reg [7:0] counter = 0;
+	always @* begin
+		assume (A || B);
+		assume (!A || !B);
+		assert (A == B);
+		cover (counter == 3 && A);
+		cover (counter == 3 && B);
+	end
+	always @(posedge CP)
+		counter <= counter + 1;
+	always @(posedge CP)
+		XP <= A;
+	always @(negedge CN)
+		XN <= B;
+endmodule