ncplot: fix unit tests following #457 (#464)

CHANGELOG.md

@@ -1,7 +1,11 @@
 This document attempts to list user-visible changes and any major internal
 rearrangements of Notcurses.
 
-* 1.2.6 (not yet released)
+* 1.2.7 (not yet released)
+  * Plots now always keep the most recent data to their far right (i.e., the
+    gap that is initially filled is on the left, rather than the right).
+
+* 1.2.6
   * `ncplane_putsimple_yx()` and `ncplane_putstr_yx()` have been exported as
     static inline functions.
   * `ncplane_set_scrolling()` has been added, allowing control over whether a
@@ -21,6 +25,7 @@ rearrangements of Notcurses.
     have been read to suggest otherwise. If you're in a long block on input, and
     get an `NCKEY_RESIZE`, just call `notcurses_refresh()` (which now calls
     `notcurses_resize()` internally, as `notcurses_render()` always has).
+  * First Fedora packaging.
 
 * 1.2.5
   * Add ncplot, with support for sliding-windowed horizontal histograms.

tests/plot.cpp

@@ -79,7 +79,7 @@ TEST_CASE("Plot") {
     CHECK(0 == ncplot_add_sample(p, 4, 6));
     CHECK(6 == p->slots[4]);
     CHECK(2 == p->slots[0]);
-    CHECK(0 == p->slotx);
+    CHECK(4 == p->slotx);
     ncplot_destroy(p);
   }
 
@@ -104,11 +104,11 @@ TEST_CASE("Plot") {
     CHECK(0 == ncplot_add_sample(p, 3, 4));
     CHECK(9 == p->slots[0]);
     CHECK(4 == p->slots[1]);
-    CHECK(2 == p->slotx);
+    CHECK(3 == p->slotx);
     CHECK(0 == ncplot_add_sample(p, 5, 1));
-    CHECK(0 == p->slots[0]);
-    CHECK(1 == p->slots[1]);
-    CHECK(4 == p->slotx);
+    CHECK(1 == p->slots[0]);
+    CHECK(0 == p->slots[1]);
+    CHECK(5 == p->slotx);
     ncplot_destroy(p);
   }
 
@@ -129,17 +129,15 @@ TEST_CASE("Plot") {
     }
     CHECK(4 == p->slots[4]);
     CHECK(0 == ncplot_add_sample(p, 10, 5));
-fprintf(stderr, "SLOT 0: %ju\n", p->slots[0]);
     CHECK(5 == p->slots[0]);
     for(int x = 1 ; x < 4 ; ++x){
-fprintf(stderr, "SLOT %d: %ju\n", x, p->slots[x]);
       CHECK(0 == p->slots[x]);
     }
     CHECK(0 == ncplot_add_sample(p, 24, 7));
-    for(int x = 0 ; x < 4 ; ++x){
+    CHECK(7 == p->slots[0]);
+    for(int x = 1 ; x < 5 ; ++x){
       CHECK(0 == p->slots[x]);
     }
-    CHECK(7 == p->slots[4]);
     CHECK(0 == ncplot_add_sample(p, 100, 0));
     for(int x = 0 ; x < 5 ; ++x){
       CHECK(0 == p->slots[x]);