pkg/stringid: replace TestShortenIdXXX with TestTruncateID table test

These tests were named confusingly as they're testing `TruncateID`.
While renaming, let's also combine them into a single test using
a test-table, so that the test-cases can carry some description
what they're testing.

Signed-off-by: Sebastiaan van Stijn <[email protected]>

pkg/stringid/stringid_test.go

@@ -13,35 +13,46 @@ func TestGenerateRandomID(t *testing.T) {
 	}
 }
 
-func TestShortenId(t *testing.T) {
-	id := "90435eec5c4e124e741ef731e118be2fc799a68aba0466ec17717f24ce2ae6a2"
-	truncID := TruncateID(id)
-	if truncID != "90435eec5c4e" {
-		t.Fatalf("Id returned is incorrect: truncate on %s returned %s", id, truncID)
+func TestTruncateID(t *testing.T) {
+	tests := []struct {
+		doc, id, expected string
+	}{
+		{
+			doc:      "empty ID",
+			id:       "",
+			expected: "",
+		},
+		{
+			// IDs are expected to be 12 (short) or 64 characters, and not be numeric only,
+			// but TruncateID should handle these gracefully.
+			doc:      "invalid ID",
+			id:       "1234",
+			expected: "1234",
+		},
+		{
+			doc:      "full ID",
+			id:       "90435eec5c4e124e741ef731e118be2fc799a68aba0466ec17717f24ce2ae6a2",
+			expected: "90435eec5c4e",
+		},
+		{
+			doc:      "digest",
+			id:       "sha256:90435eec5c4e124e741ef731e118be2fc799a68aba0466ec17717f24ce2ae6a2",
+			expected: "90435eec5c4e",
+		},
+		{
+			doc:      "very long ID",
+			id:       "90435eec5c4e124e741ef731e118be2fc799a68aba0466ec17717f24ce2ae6a290435eec5c4e124e741ef731e118be2fc799a68aba0466ec17717f24ce2ae6a2",
+			expected: "90435eec5c4e",
+		},
 	}
-}
-
-func TestShortenSha256Id(t *testing.T) {
-	id := "sha256:4e38e38c8ce0b8d9041a9c4fefe786631d1416225e13b0bfe8cfa2321aec4bba"
-	truncID := TruncateID(id)
-	if truncID != "4e38e38c8ce0" {
-		t.Fatalf("Id returned is incorrect: truncate on %s returned %s", id, truncID)
-	}
-}
-
-func TestShortenIdEmpty(t *testing.T) {
-	id := ""
-	truncID := TruncateID(id)
-	if len(truncID) > len(id) {
-		t.Fatalf("Id returned is incorrect: truncate on %s returned %s", id, truncID)
-	}
-}
 
-func TestShortenIdInvalid(t *testing.T) {
-	id := "1234"
-	truncID := TruncateID(id)
-	if len(truncID) != len(id) {
-		t.Fatalf("Id returned is incorrect: truncate on %s returned %s", id, truncID)
+	for _, tc := range tests {
+		t.Run(tc.doc, func(t *testing.T) {
+			actual := TruncateID(tc.id)
+			if actual != tc.expected {
+				t.Errorf("expected: %q, got: %q", tc.expected, actual)
+			}
+		})
 	}
 }