test: format C test files and fix clang-tidy warnings

It's probably not worth adding the C test files to regular formatting as
they're pretty much never touched, but ensuring the files are formatted
according to our standards and getting rid of warnings is a cheap
one-time fix.

test/functional/fixtures/shell-test.c

@@ -1,6 +1,7 @@
+#include <stdbool.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <string.h>
-#include <stdint.h>
 #ifdef _MSC_VER
 # include <Windows.h>
 # define usleep(usecs) Sleep(usecs/1000)
@@ -107,7 +108,7 @@ int main(int argc, char **argv)
       char cmd[100];
       int arg;
 
-      while (1) {
+      while (true) {
         fprintf(stderr, "interact $ ");
 
         if (fgets(input, sizeof(input), stdin) == NULL) {

test/functional/fixtures/streams-test.c

@@ -1,6 +1,5 @@
 /// Helper program to exit and keep stdout open (like "xclip -i -loops 1").
 #include <stdio.h>
-
 #include <uv.h>
 
 int main(int argc, char **argv)

test/unit/fixtures/multiqueue.c

@@ -1,8 +1,9 @@
-#include <string.h>
 #include <stdlib.h>
-#include "nvim/event/multiqueue.h"
+#include <string.h>
+
 #include "multiqueue.h"
 
+#include "nvim/event/multiqueue.h"
 
 void ut_multiqueue_put(MultiQueue *self, const char *str)
 {

test/unit/fixtures/multiqueue.h

@@ -1,4 +1,4 @@
 #include "nvim/event/multiqueue.h"
 
-void ut_multiqueue_put(MultiQueue *queue, const char *str);
-const char *ut_multiqueue_get(MultiQueue *queue);
+void ut_multiqueue_put(MultiQueue *self, const char *str);
+const char *ut_multiqueue_get(MultiQueue *self);

test/unit/fixtures/posix.h

@@ -1,8 +1,8 @@
-#include <unistd.h>
-#include <string.h>
 #include <errno.h>
-#include <sys/wait.h>
 #include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
 
 enum {
   kPOSIXErrnoEINTR = EINTR,

test/unit/fixtures/vterm_test.c

@@ -1,7 +1,7 @@
-#include "vterm_test.h"
-
 #include <stdio.h>
 
+#include "vterm_test.h"
+
 int parser_text(const char bytes[], size_t len, void *user)
 {
   FILE *f = fopen(VTERM_TEST_FILE, "a");
@@ -27,7 +27,8 @@ static void printchars(const char *s, size_t len, FILE *f)
   }
 }
 
-int parser_csi(const char *leader, const long args[], int argcount, const char *intermed, char command, void *user)
+int parser_csi(const char *leader, const long args[], int argcount, const char *intermed,
+               char command, void *user)
 {
   FILE *f = fopen(VTERM_TEST_FILE, "a");
   fprintf(f, "csi %02x", command);
@@ -283,11 +284,9 @@ void print_color(const VTermColor *col)
   FILE *f = fopen(VTERM_TEST_FILE, "a");
   if (VTERM_COLOR_IS_RGB(col)) {
     fprintf(f, "rgb(%d,%d,%d", col->rgb.red, col->rgb.green, col->rgb.blue);
-  }
-  else if (VTERM_COLOR_IS_INDEXED(col)) {
+  } else if (VTERM_COLOR_IS_INDEXED(col)) {
     fprintf(f, "idx(%d", col->indexed.idx);
-  }
-  else {
+  } else {
     fprintf(f, "invalid(%d", col->type);
   }
   if (VTERM_COLOR_IS_DEFAULT_FG(col)) {
@@ -322,7 +321,8 @@ int state_settermprop(VTermProp prop, VTermValue *val, void *user)
     goto end;
   case VTERM_VALUETYPE_STRING:
     fprintf(f, "settermprop %d %s\"%.*s\"%s\n", prop,
-          val->string.initial ? "[" : "", (int)val->string.len, val->string.str, val->string.final ? "]" : "");
+            val->string.initial ? "[" : "", (int)val->string.len, val->string.str,
+            val->string.final ? "]" : "");
     errcode = 0;
     goto end;
   case VTERM_VALUETYPE_COLOR:
@@ -422,7 +422,8 @@ int state_setpenattr(VTermAttr attr, VTermValue *val, void *user)
 }
 
 bool want_state_scrollback;
-int state_sb_clear(void *user) {
+int state_sb_clear(void *user)
+{
   if (!want_state_scrollback) {
     return 1;
   }

test/unit/fixtures/vterm_test.h

@@ -5,7 +5,8 @@
 #include "vterm/vterm.h"
 
 int parser_text(const char bytes[], size_t len, void *user);
-int parser_csi(const char *leader, const long args[], int argcount, const char *intermed, char command, void *user);
+int parser_csi(const char *leader, const long args[], int argcount, const char *intermed,
+               char command, void *user);
 int parser_osc(int command, VTermStringFragment frag, void *user);
 int parser_dcs(const char *command, size_t commandlen, VTermStringFragment frag, void *user);
 int parser_apc(VTermStringFragment frag, void *user);