test_history.c


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#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_is_null(prev);
}

static void next_returns_null_after_init(void)
{
    char *next = history_next();
    assert_is_null(next);
}

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("try append", prev); 
}

static void append_then_next_returns_null(void)
{
    history_append("try append");
    char *next = history_next();
    assert_is_null(next);
}

static void hits_null_at_top(void)
{
    history_append("cmd1");
    history_append("cmd2");
    history_previous(); // cmd2
    history_previous(); // cmd1
    char *prev = history_previous();
    assert_is_null(prev);
}

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("cmd3", str);
}

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", cmd3_1);

    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_is_null(end);
}

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);
}