Add tests for config

I have started writing tests for the config functions. This has resulted
in a few changes to the config code (tests working I guess)

I have also added a special "all" config file which (as the name
suggests) runs all test suites

In the makefile I have added the compiled test files to the clean target
and added targets for building and running tests

tests/all.test.c

@@ -0,0 +1,28 @@
+// This stops the main definintion in the sub suites
+#define MAINTEST
+
+#include "munit/munit.h"
+#include "config.test.c"
+#include <string.h>
+#include <stdio.h>
+
+
+
+
+int main (int argc, char* argv[]) {
+
+	MunitSuite all_suites[] = {
+		config_test_suite,
+		{ NULL, NULL, NULL, 0, MUNIT_SUITE_OPTION_NONE }
+	};
+
+	MunitSuite all_test_suite = {
+		"", /* name */
+		NULL, /* tests */
+		all_suites, /* suites */
+		1, /* iterations */
+		MUNIT_SUITE_OPTION_NONE /* options */
+	};
+
+	return munit_suite_main(&all_test_suite, NULL, argc, argv);
+}

tests/config.test.c

@@ -0,0 +1,113 @@
+#include "munit/munit.h"
+#include "../src/config.c"
+#include <unistd.h> //This has getcwd
+#include <stdlib.h> //This has getenv
+
+/*
+* Ensures that path_exists returns true on current working dir (should to exist)
+*/
+MunitResult path_that_exists(const MunitParameter params[],
+		void* user_data_or_fixture){
+	char cwd[500] = {'\0'};
+	getcwd(cwd,500);
+	munit_assert_true( path_exists( cwd ) );
+	return MUNIT_OK;
+}
+
+MunitResult path_that_doesnt_exist(const MunitParameter params[],
+		void* user_data_or_fixture){
+	char cwd[500] = {'\0'};
+	getcwd(cwd,500);
+	strcat( cwd, "thisshoudldnotexist" );
+	munit_assert_false( path_exists( cwd ) );
+	return MUNIT_OK;
+}
+
+MunitResult tilde_resolves_correctly(const MunitParameter params[],
+		void* user_data_or_fixture){
+	munit_assert_string_equal( getenv("HOME"), resolveTilde("~") );
+	return MUNIT_OK;
+}
+
+
+MunitResult check_config_dir_with_xdg(const MunitParameter params[],
+		void* user_data_or_fixture){
+	char directory[] =  "/testing/xdg/directory";
+	setenv( "XDG_CONFIG_HOME",directory, 1 );
+	munit_assert_string_equal( directory, getConfigDir() );
+	return MUNIT_OK;
+}
+
+MunitResult check_config_dir_without_xdg(const MunitParameter params[],
+		void* user_data_or_fixture){
+	unsetenv( "XDG_CONFIG_HOME" );
+	char dir[500] = {'\0'};
+	strcpy( dir, getenv("HOME") );
+	strcat( dir, "/.config" );
+	munit_assert_string_equal( dir, getConfigDir() );
+	return MUNIT_OK;
+}
+
+
+MunitTest tests[] = {
+  {
+    "/path_exists/yes", /* name */
+    path_that_exists, /* test */
+    NULL, /* setup */
+    NULL, /* tear_down */
+    MUNIT_TEST_OPTION_NONE, /* options */
+    NULL /* parameters */
+  },
+  {
+    "/path_exists/no", /* name */
+    path_that_doesnt_exist, /* test */
+    NULL, /* setup */
+    NULL, /* tear_down */
+    MUNIT_TEST_OPTION_NONE, /* options */
+    NULL /* parameters */
+  },
+  {
+    "/TildeResolves", /* name */
+    tilde_resolves_correctly, /* test */
+    NULL, /* setup */
+    NULL, /* tear_down */
+    MUNIT_TEST_OPTION_NONE, /* options */
+    NULL /* parameters */
+  },
+  {
+    "/ConfigDir/WithXDG", /* name */
+    check_config_dir_with_xdg, /* test */
+    NULL, /* setup */
+    NULL, /* tear_down */
+    MUNIT_TEST_OPTION_NONE, /* options */
+    NULL /* parameters */
+  },
+  {
+    "/ConfigDir/WithoutXDG", /* name */
+    check_config_dir_without_xdg, /* test */
+    NULL, /* setup */
+    NULL, /* tear_down */
+    MUNIT_TEST_OPTION_NONE, /* options */
+    NULL /* parameters */
+  },
+  /* Mark the end of the array with an entry where the test
+   * function is NULL */
+  { NULL, NULL, NULL, NULL, MUNIT_TEST_OPTION_NONE, NULL }
+};
+
+MunitSuite config_test_suite = {
+  "/config", /* name */
+  tests, /* tests */
+  NULL, /* suites */
+  1, /* iterations */
+  MUNIT_SUITE_OPTION_NONE /* options */
+};
+
+#ifndef MAINTEST
+#define MAINTEST
+
+int main (int argc, char* argv[]) {
+  return munit_suite_main(&config_test_suite, NULL, argc, argv);
+}
+
+#endif /* ifndef MAINTEST */