feat(xce-harness-component): consolidate harness_unit_test binary

Relocate the 13 test files that lived inside controller_unit_test into
src/harness/testsuite/, add a new Unity runner (harness_test.c, modeled
on controller_test.c) carrying their extern/RUN_TEST entries, and
register the new harness_unit_test executable + suite in
src/harness/meson.build with an explicit build-order dependency on
xce_test (two of its tests spawn that binary over a pty).

Finish clearing the controller side: remove test_test_cli.c/
test_xcetest_process_entry.c from controller_unit_test_src and their
extern/RUN_TEST entries from controller_test.c, and remove the
temporary xce_test_controller_link symlink bridge task 1.1 added (no
longer needed now that both binaries build as siblings under harness/).

Verified: harness suite 132 Tests 0 Failures 0 Ignored; controller suite
1199 Tests 0 Failures 0 Ignored. 1199+132=1331 matches the pre-move
controller_unit_test baseline exactly (cross-checked against buglog
bug-1798/bug-1805).

Task 2.1 of xce-harness-component.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RLSNJhNoULvVcUhXEFafQC

src/controller/meson.build

@@ -146,8 +146,6 @@ controller_unit_test_src = [
   '../harness/walcompare.c',
   '../harness/snapverify.c',
   '../harness/snapdiff.c',
-  'testsuite/test_xcetest_process_entry.c',
-  'testsuite/test_test_cli.c',
   'testsuite/test_persist_snapshot_entities.c',
   'testsuite/test_apply_seam.c',
   'testsuite/test_apply_committed_entry.c',
@@ -221,31 +219,9 @@ controller_unit_test = executable('controller_unit_test',
                                   c_args: ['-DXCE_TESTING'],
                                   install: false)
 
-# TEMPORARY (xce-harness-component task 1.1): test_test_cli.c and
-# test_xcetest_process_entry.c stay registered in controller_unit_test_src
-# above until task 2.1 relocates them into src/harness/testsuite/. Both
-# spawn the built xce_test binary as a subprocess via resolve_xce_test_path()
-# (test_xcetest_process_entry.c), which finds it by looking in the SAME
-# build directory as the running test binary (dirname(/proc/self/exe) +
-# "/xce_test") -- an assumption that held when xce_test built into this
-# same controller/ build subdir, and breaks now that xce_test builds into
-# harness/ instead (task 1.1's whole point). This symlink keeps that
-# assumption satisfied without touching either test file, both of which
-# are out of this task's boundary -- remove this custom_target and the
-# test()'s `depends:` below once task 2.1 physically relocates both files,
-# at which point they become genuine build-dir siblings of xce_test again
-# (mirroring harness_unit_test's own explicit dependency on the xce_test
-# target, per the design's System Flows).
-xce_test_controller_link = custom_target('xce_test_controller_link',
-  output: 'xce_test',
-  input: xce_test,
-  command: ['ln', '-sf', '../harness/xce_test', '@OUTPUT0@'],
-)
-
 test('controller test', controller_unit_test,
      suite: 'controller',
      timeout: 300,
-     depends: [xce_test_controller_link],
      env: ['ASAN_OPTIONS=detect_leaks=0'])
 
 # job-array-single-wal-record task 5.1: sched.c's push logic (sched_job_new_fun /

src/controller/testsuite/controller_test.c

@@ -65,8 +65,6 @@ extern void test_ctrlstatus(void);
 extern void test_ha_heartbeat_committed(void);
 extern void test_ha_vote_floor_heartbeat(void);
 extern void test_term_safety_adapter(void);
-extern void test_xcetest_process_entry(void);
-extern void test_test_cli(void);
 extern void test_drive_async_config(void);
 extern void test_slowlane(void);
 extern void test_commit_admission_pool(void);
@@ -241,8 +239,6 @@ int main(int argc, char* argv[])
     TEST(test_ha_heartbeat_committed);
     TEST(test_ha_vote_floor_heartbeat);
     TEST(test_term_safety_adapter);
-    TEST(test_xcetest_process_entry);
-    TEST(test_test_cli);
     TEST(test_drive_async_config);
     TEST(test_slowlane);
     TEST(test_commit_admission_pool);

src/harness/meson.build

@@ -45,3 +45,83 @@ xce_test = executable('xce_test',
                       include_directories: [incdir],
                       dependencies: xce_test_deps,
                       install: true)
+
+# Harness Unity test suite (xce-harness-component task 2.1): the 13 white-box
+# tests that used to live inside controller_unit_test. Task 1.1 already
+# removed their controller-side meson/controller_test.c registration but left
+# the files on disk in src/controller/testsuite/; this task physically
+# relocates them here and gives them their own Unity runner (harness_test.c)
+# and their own binary, registered under the 'harness' suite. Mirrors
+# controller_unit_test's own production+test pairing for the 10 files that
+# have one (waldump, walcompare, snapverify, snapdiff, configcompare, rcfile,
+# flagspec, interruptcall, confirm, listfmt_json) -- see git history
+# (src/controller/meson.build prior to task 1.1) for the exact pairing this
+# preserves. test_xcetest_interrupt.c needs no separate production file
+# (xcetest_install_sigint() is a `static inline` in include/xcetest_interrupt.h);
+# test_test_cli.c and test_xcetest_process_entry.c need none either -- both
+# spawn the built xce_test binary as a subprocess instead of linking any of
+# its production sources directly.
+# (unity_dep comes from src/lib/meson.build, ssl_dep from this file's own
+# top -- both already in scope, reused rather than redeclared.)
+
+harness_unit_test_src = [
+  'testsuite/harness_test.c',
+  'testsuite/test_waldump.c',
+  'waldump.c',
+  'testsuite/test_walcompare.c',
+  'walcompare.c',
+  'testsuite/test_snapverify.c',
+  'snapverify.c',
+  'testsuite/test_snapdiff.c',
+  'snapdiff.c',
+  'testsuite/test_configcompare.c',
+  'configcompare.c',
+  'testsuite/test_rcfile.c',
+  'rcfile.c',
+  'testsuite/test_flagspec.c',
+  'flagspec.c',
+  'testsuite/test_xcetest_interrupt.c',
+  'testsuite/test_interruptcall.c',
+  'interruptcall.c',
+  'testsuite/test_confirm.c',
+  'confirm.c',
+  'testsuite/test_listfmt_json.c',
+  'listfmt_json.c',
+  'testsuite/test_xcetest_process_entry.c',
+  'testsuite/test_test_cli.c',
+]
+
+harness_unit_test_deps = [
+  libxce_dep,
+  librtti_dep,
+  unity_dep,
+  tinylog_dep,
+  thread_dep,
+  zlib_dep,
+  c_capnproto_dep,
+  ssl_dep,
+  struct2json_dep, # testsuite/listfmt_json.c + test_listfmt_json.c: cJSON
+]
+
+harness_unit_test = executable('harness_unit_test',
+                               harness_unit_test_src,
+                               include_directories: [incdir],
+                               dependencies: harness_unit_test_deps,
+                               c_args: ['-DXCE_TESTING'],
+                               install: false)
+
+# harness_unit_test's two subprocess-spawning tests (test_test_cli.c,
+# test_xcetest_process_entry.c) locate xce_test as a build-dir sibling via
+# resolve_xce_test_path() (dirname(/proc/self/exe) + "/xce_test") -- true
+# naturally once both binaries build into this same harness/ subdir, with no
+# symlink bridge needed (unlike the temporary one task 1.1 added to
+# src/controller/meson.build for the period these files still lived there).
+# `depends:` below is still an explicit meson build-order dependency, not an
+# informal expectation -- design.md's System Flows names this as the intended
+# mechanism (mirrors how controller/meson.build depended on its own bridge
+# custom_target before this task removed it).
+test('harness unit test', harness_unit_test,
+     suite: 'harness',
+     timeout: 300,
+     depends: [xce_test],
+     env: ['ASAN_OPTIONS=detect_leaks=0'])

src/harness/testsuite/harness_test.c

@@ -0,0 +1,110 @@
+#include <argp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <unity/unity.h>
+
+extern void test_waldump(void);
+extern void test_walcompare(void);
+extern void test_snapverify(void);
+extern void test_snapdiff(void);
+extern void test_configcompare(void);
+extern void test_rcfile(void);
+extern void test_flagspec(void);
+extern void test_xcetest_interrupt(void);
+extern void test_interruptcall(void);
+extern void test_confirm(void);
+extern void test_listfmt_json(void);
+extern void test_xcetest_process_entry(void);
+extern void test_test_cli(void);
+
+void setUp(void) { return; }
+
+void tearDown(void)
+{
+    printf("\n-----------------------------------------------------\n");
+    return;
+}
+
+static char doc[]      = "harness_test";
+static char args_doc[] = "";
+
+#define MAX_TESTS (256)
+
+struct arguments {
+    int   ntests;
+    char* tests[MAX_TESTS];
+};
+
+static struct argp_option options[] = {
+    { "run", 't', "STR", 0, "run test" },
+    { 0 }
+};
+
+static error_t parse_opt(int key, char* arg, struct argp_state* state)
+{
+    struct arguments* arguments = state->input;
+
+    switch (key) {
+    case 't':
+        if (arguments->ntests >= MAX_TESTS) {
+            fprintf(stderr, "Too many tests\n");
+            exit(-1);
+        }
+        arguments->tests[arguments->ntests] = arg;
+        arguments->ntests++;
+        break;
+    default:
+        return ARGP_ERR_UNKNOWN;
+    }
+
+    return 0;
+}
+
+static struct argp argp = { options, parse_opt, args_doc, doc };
+struct arguments   arguments;
+
+static int check_test(struct arguments* args, char* x)
+{
+    int i;
+
+    if (args->ntests == 0) {
+        return 1;
+    }
+    for (i = 0; i < args->ntests; i++) {
+        if (strcmp(x, args->tests[i]) == 0) {
+            return 1;
+        }
+    }
+    return 0;
+}
+
+#define TEST(x)                                                                \
+    do {                                                                       \
+        if (check_test(&arguments, #x)) {                                      \
+            x();                                                               \
+        }                                                                      \
+    } while (0)
+
+int main(int argc, char* argv[])
+{
+    argp_parse(&argp, argc, argv, 0, 0, &arguments);
+
+    UNITY_BEGIN();
+    TEST(test_waldump);
+    TEST(test_walcompare);
+    TEST(test_snapverify);
+    TEST(test_snapdiff);
+    TEST(test_configcompare);
+    TEST(test_rcfile);
+    TEST(test_flagspec);
+    TEST(test_xcetest_interrupt);
+    TEST(test_interruptcall);
+    TEST(test_confirm);
+    TEST(test_listfmt_json);
+    TEST(test_xcetest_process_entry);
+    TEST(test_test_cli);
+
+    return UNITY_END();
+}