1 files changed, 87 insertions, 0 deletions
diff --git a/src/01/06/min_stack_test.c b/src/01/06/min_stack_test.c
new file mode 100644
index 0000000..a02c163
--- /dev/null
+++ b/src/01/06/min_stack_test.c
@@ -0,0 +1,87 @@
+#include <cgreen/cgreen.h>
+#include "min_stack.h"
+
+Describe(MinStack);
+BeforeEach(MinStack){ }
+AfterEach(MinStack){ }
+
+Ensure(MinStack, when_empty) {
+  Stack *stack = initialize();
+
+  assert_that(size(stack), is_equal_to(0));
+  assert_that(min(stack), is_equal_to(NULL));
+  assert_that(pop(stack), is_equal_to(NULL));
+
+  free(stack);
+}
+
+Ensure(MinStack, when_pushing_a_single_integer) {
+  Stack *stack = initialize();
+
+  push(stack, 1);
+
+  assert_that(size(stack), is_equal_to(1));
+  assert_that(min(stack), is_equal_to(1));
+  assert_that(pop(stack), is_equal_to(1));
+  assert_that(size(stack), is_equal_to(0));
+
+  free(stack);
+}
+
+Ensure(MinStack, when_pushing_multiple_integers_out_of_order) {
+  Stack *stack = initialize();
+
+  push(stack, 2);
+  push(stack, 3);
+  push(stack, 1);
+
+  assert_that(size(stack), is_equal_to(3));
+  assert_that(min(stack), is_equal_to(1));
+
+  assert_that(pop(stack), is_equal_to(1));
+  assert_that(size(stack), is_equal_to(2));
+
+  assert_that(pop(stack), is_equal_to(2));
+  assert_that(size(stack), is_equal_to(1));
+
+  assert_that(pop(stack), is_equal_to(3));
+  assert_that(size(stack), is_equal_to(0));
+
+  assert_that(pop(stack), is_equal_to(NULL));
+  assert_that(size(stack), is_equal_to(0));
+
+  free(stack);
+}
+
+Ensure(MinStack, when_pushing_duplicate_values_on_to_the_stack) {
+  Stack *stack = initialize();
+
+  push(stack, 2);
+  push(stack, 1);
+  push(stack, 2);
+
+  assert_that(size(stack), is_equal_to(3));
+  assert_that(min(stack), is_equal_to(1));
+
+  assert_that(pop(stack), is_equal_to(1));
+  assert_that(pop(stack), is_equal_to(2));
+  assert_that(pop(stack), is_equal_to(2));
+  assert_that(pop(stack), is_equal_to(NULL));
+
+  free(stack);
+}
+
+TestSuite *min_stack_tests() {
+  TestSuite *suite = create_test_suite();
+
+  add_test_with_context(suite, MinStack, when_empty);
+  add_test_with_context(suite, MinStack, when_pushing_a_single_integer);
+  add_test_with_context(suite, MinStack, when_pushing_multiple_integers_out_of_order);
+  return suite;
+}
+
+int main(int argc, char **argv) {
+  TestSuite *suite = create_test_suite();
+  add_suite(suite, min_stack_tests());
+  return run_test_suite(suite, create_text_reporter());
+}