✅ Unity test set up

test/test_aswm.c

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+#include "unity.h"
+#include "aswm/aswm.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/wait.h>
+
+unsigned int display_count = 100;
+char display_name[5];
+char display_fd[128];
+int xephyr_pid;
+int aswm_pid;
+Display* test_display;
+Window test_root;
+
+void run_xephyr() {
+	FILE* displayfd = fopen(display_fd, "w"); // Used to store the name of the
+											  // display on which Xephyr is
+											  // running once it's ready.
+	char dfd[256]; // File descriptor of the opened temporary file.
+	sprintf(dfd, "%i", displayfd->_fileno);
+	char* args[] = {"Xephyr", display_name, "-br", "-ac", "-screen", "1440x810", "-displayfd", dfd, "-nopn", NULL};
+	execvp(args[0], args);
+}
+
+void setUp(void) {
+	tmpnam(display_fd); // Creates a temporary file name
+	sprintf(display_name, ":%u", display_count); // Loads initial display count
+												 // in display name
+	// Tries to create the first xephyr instance
+	xephyr_pid = fork();
+	if(xephyr_pid == 0) {
+		run_xephyr();
+	} else {
+		printf("Trying to run Xephyr instance on :%u...\n", display_count);
+	}
+
+	// The following loop waits for one of those two things:
+	// 1. The display name on which Xephyr is running is loaded into content,
+	// what indicates that the X server is ready.
+	// 2. The Xephyr process as stopped, what indicates that the proposed
+	// display count was already in use. In that case, try again after
+	// incrementing display count, until valid Xephyr display is running.
+	char content[256];
+	while(strlen(content) == 0) {
+		FILE* displayfd = fopen(display_fd, "r");
+		if(displayfd != NULL) {
+			fgets(content, 256, displayfd);
+			fseek(displayfd, 0, SEEK_SET);
+			fclose(displayfd);
+		}
+
+		int stat_loc;
+		if(waitpid(xephyr_pid, &stat_loc, WNOHANG) < 0) {
+			display_count++;
+			sprintf(display_name, ":%u", display_count);
+			xephyr_pid = fork();
+			if(xephyr_pid == 0) {
+				run_xephyr();
+			} else {
+				printf("Trying to run Xephyr instance on :%u...\n", display_count);
+			}
+		}
+	}
+	sscanf(content, "%i", &display_count);
+
+	aswm_pid = fork();
+	if(aswm_pid == 0) {
+		printf("Running aswm instance on %s...\n", display_name);
+		char* args[] = {"./aswm", NULL};
+		char display_env[256];
+		sprintf(display_env, "DISPLAY=%s", display_name);
+		char* envp[] = {display_env, NULL};
+		execve(args[0], args, envp);
+	}
+	// TODO: condition in aswm to ensure it is running
+	sleep(2);
+
+	test_display = XOpenDisplay(display_name);
+	test_root = DefaultRootWindow(test_display);
+}
+
+void tearDown(void) {
+	XCloseDisplay(test_display);
+
+	kill(aswm_pid, SIGTERM);
+	kill(xephyr_pid, SIGTERM);
+}
+
+void run_aswm(void) {
+	int stat_loc;
+	// Ensures aswm is running
+	TEST_ASSERT_EQUAL_INT(0, waitpid(aswm_pid, &stat_loc, WNOHANG));
+}
+
+void create_default_top_level_window(void) {
+	Window window = XCreateSimpleWindow(test_display, test_root,
+			10 /*x*/, 10 /*y*/, 128 /*w*/, 128 /*h*/,
+			2 /*border width*/, CopyFromParent /*depth*/, 0xFF00FF00 /* background */);
+	XMapWindow(test_display, window);
+	XSelectInput(test_display, window, StructureNotifyMask | VisibilityNotify);
+
+	bool mapped = false;
+	int visibility_received = false;
+	int visibility;
+	while(!mapped && !visibility_received) {
+		XEvent e;
+		XNextEvent(test_display, &e);
+
+		switch(e.type) {
+			case MapNotify:
+				mapped = true;
+				break;
+			case VisibilityNotify:
+				visibility_received = true;
+				visibility = e.xvisibility.state;
+				break;
+			default:
+		}
+	}
+
+	TEST_ASSERT_EQUAL_INT(VisibilityUnobscured, visibility);
+}
+
+// not needed when using generate_test_runner.rb
+int main(void) {
+    UNITY_BEGIN();
+    RUN_TEST(run_aswm);
+    RUN_TEST(create_default_top_level_window);
+    return UNITY_END();
+}