Claude
37b1527279
Captain Bob, 2026-11-12: "Build an appropriate test harness! Love the idea." The kernel had no tests below the boots, so defects QEMU cannot provoke could not be tested first. Plan: docs/v4.0.0/plans/2026-11-12-kernel-host-tests.md. kernel/tests/: one host program per kernel source, built with that source as it is, the kernel's flags (-std=c99 -Wall -Wextra -Werror), and fakes -- the console captured line by line, a deterministic RNG that can fail, and a RAM disk whose reads, writes or flushes fail at chosen 1 KiB blocks. make -C kernel/tests test runs them; SRC_<test>= runs a test against other code, which is how a test is seen to fail against the code before a fix. test_gpt.c, 12 checks: a table written and read back; 16, 17 and 18 used entries against max 16 and an entry out of range after the 16th (#180); the RNG, the first write, a later write and a flush failing (#168). Against gpt.c before #168 and #180: 4 failures, each defect caught. Now: 0. Both runs in logs/.../kernel-tests/. Not yet a protocol stage: to rule (the plan, step 5). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017RzZgrf7V7Zk2iczBXDRbm
40 lines
1.4 KiB
Makefile
40 lines
1.4 KiB
Makefile
# SPDX-License-Identifier: LicenseRef-Starship-1.0
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# Copyright (c) 2023-2026 Robert A. James
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#
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# The kernel host tests (docs/v4.0.0/plans/2026-11-12-kernel-host-tests.md): each test_<unit>.c
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# built on the host with the kernel source file(s) it tests and the fakes, nothing else of the
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# kernel, and run.
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#
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# make -C kernel/tests test build and run them all; fails if any check fails
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# make -C kernel/tests run-test_gpt
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#
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# A test's sources are SRC_<test>; give another on the command line to run the same test against
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# it (how a test is seen to fail against the code before a fix):
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# make -C kernel/tests run-test_gpt SRC_test_gpt=/path/to/old/gpt.c
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HERE := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))
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ROOT := $(abspath $(HERE)/../..)
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BUILD := $(ROOT)/build/kernel-tests
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CC ?= cc
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CFLAGS := -std=c99 -Wall -Wextra -Werror -O2 -g -I$(HERE) -I$(ROOT)/kernel/include \
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-I$(ROOT)/kernel/include/starkernel -I$(ROOT)/v3/include
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TESTS := test_gpt
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SRC_test_gpt := $(ROOT)/kernel/src/gpt.c
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define TEST_RULE
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$(BUILD)/$(1): $(HERE)/$(1).c $(HERE)/fakes.c $(HERE)/fakes.h $(HERE)/harness.h $$(SRC_$(1))
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@mkdir -p $(BUILD)
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$(CC) $(CFLAGS) $(HERE)/$(1).c $(HERE)/fakes.c $$(SRC_$(1)) -o $$@
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.PHONY: run-$(1)
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run-$(1): $(BUILD)/$(1)
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@echo "$(1)"
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@$(BUILD)/$(1)
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endef
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$(foreach t,$(TESTS),$(eval $(call TEST_RULE,$(t))))
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.PHONY: test
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test: $(addprefix run-,$(TESTS))
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@echo "all kernel host tests passed"
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