diff --git a/tests/progbar.cpp b/tests/progbar.cpp
index 18a83a615..615504290 100644
--- a/tests/progbar.cpp
+++ b/tests/progbar.cpp
@@ -76,5 +76,84 @@ TEST_CASE("ProgressBar") {
     }
     ncprogbar_destroy(pbar);
   }
+
+  SUBCASE("DualCellLeft") {
+    struct ncplane_options nopts = {
+      .y = 0,
+      .x = 0,
+      .rows = 1,
+      .cols = 2,
+      .userptr = nullptr,
+      .name = "pbar",
+      .resizecb = nullptr,
+      .flags = 0,
+    };
+    const char* egcs[] = { " ", "▏", "▎", "▍", "▌", "▋", "▊", "▉" };
+    auto n = ncplane_create(n_, &nopts);
+    REQUIRE(nullptr != n);
+    struct ncprogbar_options popts = {
+      .ulchannel = 0,
+      .urchannel = 0,
+      .blchannel = 0,
+      .brchannel = 0,
+      .flags = 0,
+    };
+    auto pbar = ncprogbar_create(n, &popts);
+    double p = 0;
+    int i = 0;
+    do{
+      CHECK(0 == ncprogbar_set_progress(pbar, p));
+      CHECK(0 == notcurses_render(nc_));
+      uint16_t smask;
+      uint64_t channels;
+      char* egc = notcurses_at_yx(nc_, 0, i / 8, &smask, &channels);
+      REQUIRE(nullptr != egc);
+      CHECK(0 == strcmp(egc, egcs[i % 8]));
+      free(egc);
+      p += 0.0625;
+      ++i;
+    }while(p < 1);
+    ncprogbar_destroy(pbar);
+  }
+
+  SUBCASE("DualCellRight") {
+    struct ncplane_options nopts = {
+      .y = 0,
+      .x = 0,
+      .rows = 1,
+      .cols = 2,
+      .userptr = nullptr,
+      .name = "pbar",
+      .resizecb = nullptr,
+      .flags = 0,
+    };
+    const char* egcs[] = { " ", "🮇", "🮇", "🮈", "▐", "🮉", "🮊", "🮋" };
+    auto n = ncplane_create(n_, &nopts);
+    REQUIRE(nullptr != n);
+    struct ncprogbar_options popts = {
+      .ulchannel = 0,
+      .urchannel = 0,
+      .blchannel = 0,
+      .brchannel = 0,
+      .flags = NCPROGBAR_OPTION_RETROGRADE,
+    };
+    auto pbar = ncprogbar_create(n, &popts);
+    double p = 0;
+    int i = 0;
+    do{
+      CHECK(0 == ncprogbar_set_progress(pbar, p));
+      CHECK(0 == notcurses_render(nc_));
+      uint16_t smask;
+      uint64_t channels;
+      char* egc = notcurses_at_yx(nc_, 0, 1 - i / 8, &smask, &channels);
+      REQUIRE(nullptr != egc);
+      CHECK(0 == strcmp(egc, egcs[i % 8]));
+      free(egc);
+      p += 0.0625;
+      ++i;
+    }while(p < 1);
+    ncprogbar_destroy(pbar);
+  }
+
   CHECK(0 == notcurses_stop(nc_));
 }