feat(expansion): parse_subshell_str and tests

tests/unit/expansion/parse_subshell.c

@@ -0,0 +1,72 @@
+#include <criterion/criterion.h>
+#include <criterion/new/assert.h>
+
+#include "../../../src/expansion/expansion.h"
+
+TestSuite(parse_subshell_str);
+
+Test(parse_subshell_str, basic_subshell)
+{
+    char *input = "(ls -l)";
+    char *extracted_var = NULL;
+    size_t r = parse_subshell_str(input, &extracted_var);
+
+    cr_expect(r == 7);
+    cr_expect_str_eq(extracted_var, "ls -l");
+    free(extracted_var);
+}
+
+Test(parse_subshell_str, multi_basic_subshell)
+{
+    char *input = "(echo hello) and (echo world)";
+    char *extracted_var = NULL;
+    size_t r = parse_subshell_str(input, &extracted_var);
+
+    cr_expect(r == 12);
+    cr_expect_str_eq(extracted_var, "echo hello");
+    free(extracted_var);
+
+    input += r + 5; // skip " and "
+    r = parse_subshell_str(input, &extracted_var);
+
+    cr_expect(r == 12);
+    cr_expect_str_eq(extracted_var, "echo world");
+    free(extracted_var);
+}
+
+Test(parse_subshell_str, incomplete_braces)
+{
+    char *input = "(echo hello";
+    char *extracted_var = NULL;
+    size_t r = parse_subshell_str(input, &extracted_var);
+
+    cr_expect(r == 0);
+    cr_expect(extracted_var == NULL);
+}
+
+Test(parse_subshell_str, empty_braces)
+{
+    char *input = "()";
+    char *extracted_var = NULL;
+    size_t r = parse_subshell_str(input, &extracted_var);
+
+    cr_expect(r == 0);
+    cr_expect(extracted_var == NULL);
+}
+
+Test(parse_subshell_str, nested_subshell)
+{
+    char *input = "(echo (nested))";
+    char *extracted_var = NULL;
+    size_t r = parse_subshell_str(input, &extracted_var);
+
+    cr_expect(r == 15);
+    cr_expect_str_eq(extracted_var, "echo (nested)");
+    free(extracted_var);
+
+    char *nested = input + 6; // point to the nested subshell
+    r = parse_subshell_str(nested, &extracted_var);
+    cr_expect(r == 8);
+    cr_expect_str_eq(extracted_var, "nested");
+    free(extracted_var);
+}

tests/unit/expansion/parse_var.c

@@ -1,6 +1,5 @@
 #include <criterion/criterion.h>
 #include <criterion/new/assert.h>
-#include <criterion/redirect.h>
 
 #include "../../../src/expansion/expansion.h"