1 files changed, 130 insertions, 0 deletions
diff --git a/test_history.c b/test_history.c
new file mode 100644
index 00000000..14fbe564
--- /dev/null
+++ b/test_history.c
@@ -0,0 +1,130 @@
+#include <stdlib.h>
+#include <head-unit.h>
+#include "history.h"
+
+static void beforetest(void)
+{
+    history_init();
+}
+
+static void previous_returns_null_after_init(void)
+{
+    char *prev = history_previous();
+    assert_true(prev == NULL);
+}
+
+static void next_returns_null_after_init(void)
+{
+    char *next = history_next();
+    assert_true(next == NULL);
+}
+
+static void append_after_init_doesnt_fail(void)
+{
+    history_append("try append");
+    assert_true(1);
+}
+
+static void append_then_previous_returns_appended(void)
+{
+    history_append("try append");
+    char *prev = history_previous();
+    assert_string_equals(prev, "try append"); 
+}
+
+static void append_then_next_returns_null(void)
+{
+    history_append("try append");
+    char *next = history_next();
+    assert_true(next == NULL);
+}
+
+static void hits_null_at_top(void)
+{
+    history_append("cmd1");
+    history_append("cmd2");
+    history_previous(); // cmd2
+    history_previous(); // cmd1
+    char *prev = history_previous();
+    assert_true(prev == NULL);
+}
+
+static void navigate_to_correct_item(void)
+{
+    history_append("cmd1");
+    history_append("cmd2");
+    history_append("cmd3");
+    history_append("cmd4");
+    history_append("cmd5");
+    history_append("cmd6");
+
+    history_previous(); // cmd6
+    history_previous(); // cmd5
+    history_previous(); // cmd4
+    history_previous(); // cmd3
+    history_next(); // cmd4
+    history_previous(); // cmd3
+    history_previous(); // cmd2
+    char *str = history_next(); // cmd3
+
+    assert_string_equals(str, "cmd3");
+}
+
+static void append_previous_item(void)
+{
+    history_append("cmd1");
+    history_append("cmd2");
+    history_append("cmd3");
+    history_append("cmd4");
+    history_append("cmd5");
+    history_append("cmd6");
+
+    history_previous(); // cmd6
+    history_previous(); // cmd5
+    history_previous(); // cmd4
+    history_previous(); // cmd3
+    history_next(); // cmd4
+    history_previous(); // cmd3
+    history_previous(); // cmd2
+    char *str = history_next(); // cmd3
+
+    history_append(str);
+
+    char *cmd3_1 = history_previous();
+    assert_string_equals(cmd3_1, "cmd3");
+
+    char *cmd6 = history_previous();
+    assert_string_equals(cmd6, "cmd6");
+
+    char *cmd5 = history_previous();
+    assert_string_equals(cmd5, "cmd5");
+
+    char *cmd4 = history_previous();
+    assert_string_equals(cmd4, "cmd4");
+
+    char *cmd3 = history_previous();
+    assert_string_equals(cmd3, "cmd3");
+
+    char *cmd2 = history_previous();
+    assert_string_equals(cmd2, "cmd2");
+
+    char *cmd1 = history_previous();
+    assert_string_equals(cmd1, "cmd1");
+
+    char *end = history_previous();
+    assert_true(end == NULL);
+}
+
+void register_history_tests(void)
+{
+    TEST_MODULE("history tests");
+    BEFORETEST(beforetest);
+    TEST(previous_returns_null_after_init);
+    TEST(next_returns_null_after_init);
+    TEST(append_after_init_doesnt_fail);
+    TEST(append_then_previous_returns_appended);
+    TEST(append_then_next_returns_null);
+    TEST(hits_null_at_top);
+    TEST(navigate_to_correct_item);
+    TEST(append_previous_item);
+}