Add edge detection tests for wipesides

These should be nice and robust to small changes that are still valid, as they don't depend on the output not changing, only on the detected sides being within appropriate limits.

2 files changed, 40 insertions, 5 deletions

diff --git a/testdata/0002.png b/testdata/0002.png
new file mode 100644
index 0000000..fb40761
--- /dev/null
+++ b/testdata/0002.png
diff --git a/wipesides_test.go b/wipesides_test.go
index 4906c5b..36d884e 100644
--- a/wipesides_test.go
+++ b/wipesides_test.go
@@ -13,23 +13,24 @@ import (
 	"image/png"
 	"os"
 	"testing"
+
+	"rescribe.xyz/integralimg"
 )
 
 func TestWipeSides(t *testing.T) {
 	cases := []struct {
-		name   string
 		orig   string
 		golden string
 		thresh float64
 		wsize  int
 	}{
-		{"integralwipesides", "testdata/pg2.png", "testdata/pg2_integralwipesides_t0.02_w5.png", 0.02, 5},
-		{"integralwipesides", "testdata/pg2.png", "testdata/pg2_integralwipesides_t0.05_w5.png", 0.05, 5},
-		{"integralwipesides", "testdata/pg2.png", "testdata/pg2_integralwipesides_t0.05_w25.png", 0.05, 25},
+		{"testdata/pg2.png", "testdata/pg2_integralwipesides_t0.02_w5.png", 0.02, 5},
+		{"testdata/pg2.png", "testdata/pg2_integralwipesides_t0.05_w5.png", 0.05, 5},
+		{"testdata/pg2.png", "testdata/pg2_integralwipesides_t0.05_w25.png", 0.05, 25},
 	}
 
 	for _, c := range cases {
-		t.Run(fmt.Sprintf("%s_%0.2f_%d", c.name, c.thresh, c.wsize), func(t *testing.T) {
+		t.Run(fmt.Sprintf("Exact/%s_%0.2f_%d", c.orig, c.thresh, c.wsize), func(t *testing.T) {
 			var actual *image.Gray
 			orig, err := decode(c.orig)
 			if err != nil {
@@ -56,4 +57,38 @@ func TestWipeSides(t *testing.T) {
 			}
 		})
 	}
+	testedgecases := []struct {
+		filename string
+		minleft  int
+		maxleft  int
+		minright int
+		maxright int
+		thresh   float64
+		wsize    int
+	}{
+		{"testdata/0002.png", 36, 250, 967, 998, 0.02, 5},
+	}
+
+	for _, c := range testedgecases {
+		t.Run(fmt.Sprintf("Edge/%s_%0.2f_%d", c.filename, c.thresh, c.wsize), func(t *testing.T) {
+			img, err := decode(c.filename)
+			if err != nil {
+				t.Fatalf("Could not open file %s: %v\n", c.filename, err)
+			}
+			integral := integralimg.ToIntegralImg(img)
+			leftedge, rightedge := findedges(integral, c.wsize, c.thresh)
+			if leftedge < c.minleft {
+				t.Errorf("Left edge %d < minimum %d", leftedge, c.minleft)
+			}
+			if leftedge > c.maxleft {
+				t.Errorf("Left edge %d > maximum %d", leftedge, c.maxleft)
+			}
+			if rightedge < c.minright {
+				t.Errorf("Right edge %d < minimum %d", rightedge, c.minright)
+			}
+			if rightedge > c.maxright {
+				t.Errorf("Right edge %d > maximum %d", rightedge, c.maxright)
+			}
+		})
+	}
 }