Added CSV to ASCII table

textfilters_test.go

@@ -0,0 +1,92 @@
+package main
+
+import (
+	"context"
+	"testing"
+)
+
+func TestCSVToASCIITable(t *testing.T) {
+	filter := TextFilters["csv-to-ascii-table"].Filter
+
+	tests := []struct {
+		name    string
+		input   string
+		want    string
+		wantErr bool
+	}{
+		{
+			name: "basic table with quoted value",
+			input: "alpha,bravo\n" +
+				"1,b\n" +
+				"\"long value\",something\n",
+			want: "alpha      bravo\n" +
+				"---------- ---------\n" +
+				"1          b\n" +
+				"long value something\n" +
+				"---------- ---------\n",
+		},
+		{
+			name:  "no trailing newline",
+			input: "a,b\n1,2",
+			want: "a b\n" +
+				"- -\n" +
+				"1 2\n" +
+				"- -",
+		},
+		{
+			name:  "quoted field containing comma",
+			input: "name,desc\n\"x, y\",z\n",
+			want: "name desc\n" +
+				"---- ----\n" +
+				"x, y z\n" +
+				"---- ----\n",
+		},
+		{
+			name:  "ragged rows padded with empty cells",
+			input: "a,b,c\n1\n2,3\n",
+			want: "a b c\n" +
+				"- - -\n" +
+				"1\n" +
+				"2 3\n" +
+				"- - -\n",
+		},
+		{
+			name:  "header only",
+			input: "one,two\n",
+			want: "one two\n" +
+				"--- ---\n" +
+				"--- ---\n",
+		},
+		{
+			name:  "empty input unchanged",
+			input: "",
+			want:  "",
+		},
+		{
+			name:    "invalid CSV returns error",
+			input:   "a,\"b\nc",
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			resp, err := filter(context.Background(), tt.input)
+			if tt.wantErr {
+				if err == nil {
+					t.Fatalf("expected error, got output %q", resp.Output)
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if resp.Output != tt.want {
+				t.Errorf("output mismatch\ngot:\n%s\nwant:\n%s", resp.Output, tt.want)
+			}
+			if resp.Append {
+				t.Errorf("Append should be false")
+			}
+		})
+	}
+}