test: add table-driven unit tests for post, processor, generator

Cover NewID; txt autolink helpers; markdown local image discovery;
pagination, page filenames, JSON script literals, time formatting,
and buildPageData nav links.

Made-with: Cursor

1 files changed, 90 insertions, 0 deletions

diff --git a/internal/processor/markdown_test.go b/internal/processor/markdown_test.go
new file mode 100644
index 0000000..a17b704
--- /dev/null
+++ b/internal/processor/markdown_test.go
@@ -0,0 +1,90 @@
+package processor
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestFindLocalImages(t *testing.T) {
+	t.Parallel()
+
+	t.Run("remote skipped", func(t *testing.T) {
+		t.Parallel()
+		dir := t.TempDir()
+		got := findLocalImages(`![](https://cdn.example/p.png) ![](http://x/y.jpg)`, dir)
+		if len(got) != 0 {
+			t.Fatalf("expected no locals, got %v", got)
+		}
+	})
+
+	t.Run("missing file ignored", func(t *testing.T) {
+		t.Parallel()
+		dir := t.TempDir()
+		got := findLocalImages(`![](nope.png)`, dir)
+		if len(got) != 0 {
+			t.Fatalf("expected no locals, got %v", got)
+		}
+	})
+
+	t.Run("picks existing basename", func(t *testing.T) {
+		t.Parallel()
+		dir := t.TempDir()
+		if err := os.WriteFile(filepath.Join(dir, "shot.png"), []byte("x"), 0o644); err != nil {
+			t.Fatal(err)
+		}
+		got := findLocalImages(`![alt](shot.png)`, dir)
+		if len(got) != 1 || got[0] != "shot.png" {
+			t.Fatalf("got %v; want [shot.png]", got)
+		}
+	})
+
+	tests := []struct {
+		name    string
+		md      string
+		files   []string
+		want    []string
+		wantLen int
+	}{
+		{
+			name:    "multiple locals order",
+			md:      `![](a.png) ![](b.png)`,
+			files:   []string{"a.png", "b.png"},
+			wantLen: 2,
+		},
+		{
+			name:    "alt with spaces",
+			md:      `![my photo](z.gif)`,
+			files:   []string{"z.gif"},
+			want:    []string{"z.gif"},
+			wantLen: 1,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			dir := t.TempDir()
+			for _, f := range tt.files {
+				if err := os.WriteFile(filepath.Join(dir, f), []byte("x"), 0o644); err != nil {
+					t.Fatal(err)
+				}
+			}
+			got := findLocalImages(tt.md, dir)
+			if tt.want != nil {
+				if len(got) != len(tt.want) {
+					t.Fatalf("got %v; want %v", got, tt.want)
+				}
+				for i := range tt.want {
+					if got[i] != tt.want[i] {
+						t.Fatalf("got %v; want %v", got, tt.want)
+					}
+				}
+				return
+			}
+			if len(got) != tt.wantLen {
+				t.Fatalf("len(got)=%d; want %d (%v)", len(got), tt.wantLen, got)
+			}
+		})
+	}
+}