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! TEST: Phase 1 - Circuit Depth Calculation
! =====================================================================
! Tests logical_depth() and gate_count() methods
! Reference: SCAFFOLDS_IN_PROGRESS.md, Task 2.1
! =====================================================================
program test_phase1_depth
use bob_circuit
use bob_kinds
implicit none
type(bob_circuit_t) :: c
integer(i4) :: depth, gate_cnt, st
integer :: passed, failed, test_num
passed = 0
failed = 0
test_num = 0
print *, "========================================================"
print *, "PHASE 1 CIRCUIT DEPTH TESTS"
print *, "========================================================"
print *, ""
! ===================================================================
! TEST 1: Single Hadamard (depth should be 1)
! ===================================================================
test_num = 1
print *, "TEST ", test_num, ": Single Hadamard gate"
c = circuit_new(1, 0)
call c%add_gate(GATE_HADAMARD, 0, status=st)
depth = c%logical_depth()
gate_cnt = c%gate_count()
print *, " Gates: ", gate_cnt, " (expected: 1)"
print *, " Logical depth: ", depth, " (expected: 1)"
if (gate_cnt == 1 .and. depth == 1) then
print *, " ✓ PASSED"
passed = passed + 1
else
print *, " ✗ FAILED"
failed = failed + 1
end if
print *, ""
! ===================================================================
! TEST 2: Two parallel Hadamards on different qubits (depth should be 1)
! ===================================================================
test_num = 2
print *, "TEST ", test_num, ": Two parallel Hadamards (different qubits)"
c = circuit_new(2, 0)
call c%add_gate(GATE_HADAMARD, 0, status=st)
call c%add_gate(GATE_HADAMARD, 1, status=st)
depth = c%logical_depth()
gate_cnt = c%gate_count()
print *, " Gates: ", gate_cnt, " (expected: 2)"
print *, " Logical depth: ", depth, " (expected: 1) [parallel gates]"
if (gate_cnt == 2 .and. depth == 1) then
print *, " ✓ PASSED"
passed = passed + 1
else
print *, " ✗ FAILED (parallel gates should have depth 1)"
failed = failed + 1
end if
print *, ""
! ===================================================================
! TEST 3: Serial gates on same qubit (depth should be 3)
! ===================================================================
test_num = 3
print *, "TEST ", test_num, ": Three serial gates on same qubit"
c = circuit_new(1, 0)
call c%add_gate(GATE_HADAMARD, 0, status=st)
call c%add_gate(GATE_PAULI_X, 0, status=st)
call c%add_gate(GATE_PAULI_Z, 0, status=st)
depth = c%logical_depth()
gate_cnt = c%gate_count()
print *, " Gates: ", gate_cnt, " (expected: 3)"
print *, " Logical depth: ", depth, " (expected: 3) [serial gates]"
if (gate_cnt == 3 .and. depth == 3) then
print *, " ✓ PASSED"
passed = passed + 1
else
print *, " ✗ FAILED"
failed = failed + 1
end if
print *, ""
! ===================================================================
! TEST 4: CNOT creates dependency (depth should be 2)
! ===================================================================
test_num = 4
print *, "TEST ", test_num, ": CNOT with dependency"
c = circuit_new(2, 0)
call c%add_gate(GATE_HADAMARD, 0, status=st)
call c%add_gate(GATE_HADAMARD, 1, status=st) ! Parallel H
call c%add_gate(GATE_CNOT, 1, control=0, status=st) ! Depends on both q0 and q1
depth = c%logical_depth()
gate_cnt = c%gate_count()
print *, " Gates: ", gate_cnt, " (expected: 3)"
print *, " Logical depth: ", depth, " (expected: 2) [H layer + CNOT layer]"
if (gate_cnt == 3 .and. depth == 2) then
print *, " ✓ PASSED"
passed = passed + 1
else
print *, " ✗ FAILED"
failed = failed + 1
end if
print *, ""
! ===================================================================
! TEST 5: Empty circuit (depth should be 0)
! ===================================================================
test_num = 5
print *, "TEST ", test_num, ": Empty circuit"
c = circuit_new(2, 0)
depth = c%logical_depth()
gate_cnt = c%gate_count()
print *, " Gates: ", gate_cnt, " (expected: 0)"
print *, " Logical depth: ", depth, " (expected: 0)"
if (gate_cnt == 0 .and. depth == 0) then
print *, " ✓ PASSED"
passed = passed + 1
else
print *, " ✗ FAILED"
failed = failed + 1
end if
print *, ""
! ===================================================================
! TEST 6: Bell state circuit
! ===================================================================
test_num = 6
print *, "TEST ", test_num, ": Bell pair (H + CNOT)"
c = circuit_bell_pair()
depth = c%logical_depth()
gate_cnt = c%gate_count()
print *, " Gates: ", gate_cnt
print *, " Logical depth: ", depth, " (expected: 2) [H then CNOT]"
! Bell pair: H on q0, CNOT(q1, control=q0), measure on q0, measure on q1
! Depth should be: H=1, CNOT=2 (depends on H), measure=3 (both)
! So max is 3 for full circuit, but if we count just H+CNOT it's 2
if (gate_cnt >= 2 .and. depth >= 2) then
print *, " ✓ PASSED (depth >= 2)"
passed = passed + 1
else
print *, " ✗ FAILED"
failed = failed + 1
end if
print *, ""
! ===================================================================
! Summary
! ===================================================================
print *, "========================================================"
print *, "SUMMARY"
print *, " Passed: ", passed, "/", test_num
print *, " Failed: ", failed, "/", test_num
print *, "========================================================"
if (failed == 0) then
print *, "ALL TESTS PASSED ✓"
stop 0
else
print *, "SOME TESTS FAILED ✗"
stop 1
end if
end program test_phase1_depth
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