libgimp: new unit tests around GimpImage and item API.

Right now, it only tests a few API, such as creating an image, then a
text layer, then inserting it in the image.

This is a test to avoid regression bug after having fixed #9923 in a
previous commit.

libgimp/tests/meson.build

@@ -8,6 +8,7 @@ endif
 
 tests = [
   'color-parser',
+  'image',
   'palette',
   'selection-float',
   'unit',

libgimp/tests/test-image.c

@@ -0,0 +1,39 @@
+/* Sometimes odd dimensions may create weird situations. It's usually a
+ * good idea to test both even and odd dimensions.
+ */
+#define NEW_IMAGE_WIDTH  1920
+#define NEW_IMAGE_HEIGHT 2001
+
+static GimpValueArray *
+gimp_c_test_run (GimpProcedure        *procedure,
+                 GimpRunMode           run_mode,
+                 GimpImage            *image,
+                 gint                  n_drawables,
+                 GimpDrawable        **drawables,
+                 GimpProcedureConfig  *config,
+                 gpointer              run_data)
+{
+  GimpImage     **images;
+  GimpImage      *new_image;
+  GimpTextLayer  *text_layer;
+  gint            n_images;
+
+  GIMP_TEST_START("gimp_image_new()");
+  new_image = gimp_image_new (NEW_IMAGE_WIDTH, NEW_IMAGE_HEIGHT, GIMP_RGB);
+  GIMP_TEST_END(GIMP_IS_IMAGE (new_image));
+
+  GIMP_TEST_START("gimp_get_images()");
+  images = gimp_get_images (&n_images);
+  GIMP_TEST_END(n_images == 1 && images[0] == new_image);
+  g_free (images);
+
+  GIMP_TEST_START("gimp_text_layer_new()");
+  text_layer = gimp_text_layer_new (new_image, "hello world", gimp_context_get_font (),
+                                    20, gimp_unit_point ());
+  GIMP_TEST_END(GIMP_IS_TEXT_LAYER (text_layer));
+
+  GIMP_TEST_START("gimp_image_insert_layer()");
+  GIMP_TEST_END(gimp_image_insert_layer (new_image, GIMP_LAYER (text_layer), NULL, 0));
+
+  GIMP_TEST_RETURN
+}

libgimp/tests/test-image.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+
+NEW_IMAGE_WIDTH=1920
+NEW_IMAGE_HEIGHT=2001
+
+image = Gimp.Image.new(NEW_IMAGE_WIDTH, NEW_IMAGE_HEIGHT, Gimp.ImageBaseType.RGB)
+gimp_assert('Gimp.Image.new()', type(image) == Gimp.Image)
+
+images = Gimp.get_images()
+gimp_assert('Gimp.get_images()', len(images) == 1 and images[0] == image)
+
+text_layer = Gimp.TextLayer.new(image, "hello world", Gimp.context_get_font(), 20, Gimp.Unit.point())
+gimp_assert('Gimp.TextLayer.new()', type(text_layer) == Gimp.TextLayer)
+
+gimp_assert('Gimp.Image.InsertLayer()', image.insert_layer(text_layer, None, 0))