1 files changed, 381 insertions, 0 deletions
diff --git a/internal/ui/widgets/textviewentry_test.go b/internal/ui/widgets/textviewentry_test.go
new file mode 100644
index 0000000..bbb20ef
--- /dev/null
+++ b/internal/ui/widgets/textviewentry_test.go
@@ -0,0 +1,381 @@
+package widgets
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func newTVE() *TextViewEntry {
+	e := &TextViewEntry{}
+	e.ExtendBaseWidget(e)
+	return e
+}
+
+// ── splitRaw ─────────────────────────────────────────────────────────────────
+
+func TestSplitRaw(t *testing.T) {
+	tests := []struct {
+		input string
+		want  []string
+	}{
+		{"", []string{""}},
+		{"a\nb", []string{"a", "b"}},
+		{"a\r\nb", []string{"a", "b"}},
+		{"a\rb", []string{"a", "b"}},
+		{"a\nb\nc", []string{"a", "b", "c"}},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			got := splitRaw(tt.input)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
+
+// ── buildVisualLines ─────────────────────────────────────────────────────────
+
+func TestBuildVisualLines_NoWrap(t *testing.T) {
+	lines := buildVisualLines([]string{"GET /foo HTTP/1.1", "Host: example.com"}, 80)
+	assert.Len(t, lines, 2)
+}
+
+func TestBuildVisualLines_Wraps(t *testing.T) {
+	long := strings.Repeat("x", 100)
+	lines := buildVisualLines([]string{long}, 40)
+
+	assert.Greater(t, len(lines), 2, "expected ≥3 visual lines for 100-char line at width 40")
+
+	for _, vl := range lines {
+		assert.Equal(t, 0, vl.logicalIdx, "all chunks should map to logicalIdx 0")
+	}
+
+	expected := 0
+	for _, vl := range lines {
+		assert.Equal(t, expected, vl.colOffset)
+		expected += len([]rune(vl.raw))
+	}
+}
+
+func TestBuildVisualLines_EmptyLine(t *testing.T) {
+	lines := buildVisualLines([]string{"GET /foo HTTP/1.1", "", `{"key":"val"}`}, 80)
+	assert.Len(t, lines, 3)
+}
+
+func TestBuildVisualLines_EmptyInput(t *testing.T) {
+	lines := buildVisualLines([]string{""}, 80)
+	assert.Len(t, lines, 1)
+}
+
+// ── logicalToVisual ──────────────────────────────────────────────────────────
+
+func TestLogicalToVisual_Simple(t *testing.T) {
+	visual := buildVisualLines([]string{"hello", "world"}, 80)
+
+	v, col := logicalToVisual(visual, 0, 0)
+	assert.Equal(t, 0, v)
+	assert.Equal(t, 0, col)
+
+	v, col = logicalToVisual(visual, 1, 3)
+	assert.Equal(t, 1, visual[v].logicalIdx)
+	assert.Equal(t, 3, col)
+}
+
+func TestLogicalToVisual_EndOfLine(t *testing.T) {
+	visual := buildVisualLines([]string{"hello"}, 80)
+
+	v, col := logicalToVisual(visual, 0, 5)
+	assert.Equal(t, 0, v)
+	assert.Equal(t, 5, col)
+}
+
+func TestLogicalToVisual_WrappedLine(t *testing.T) {
+	// "01234567890123456789" wrapped at 10 → chunks [0:10] [10:20]
+	visual := buildVisualLines([]string{"01234567890123456789"}, 10)
+
+	v, col := logicalToVisual(visual, 0, 11)
+	assert.Equal(t, 10, visual[v].colOffset, "col 11 should land in chunk starting at offset 10")
+	assert.Equal(t, 1, col)
+}
+
+func TestLogicalToVisual_EndOfWrappedLine(t *testing.T) {
+	// "01234567890123456789" wrapped at 10 → chunks [0:10] [10:20]
+	visual := buildVisualLines([]string{"01234567890123456789"}, 10)
+
+	v, _ := logicalToVisual(visual, 0, 20)
+	assert.Equal(t, visual[len(visual)-1].colOffset, visual[v].colOffset, "col at end should land in last chunk")
+}
+
+// ── normaliseSelection ───────────────────────────────────────────────────────
+
+func TestNormaliseSelection_Forward(t *testing.T) {
+	e := newTVE()
+	e.selAnchorLine, e.selAnchorCol = 0, 2
+	e.selLine, e.selCol = 1, 5
+
+	sl, sc, el, ec := e.normaliseSelection()
+	assert.Equal(t, 0, sl)
+	assert.Equal(t, 2, sc)
+	assert.Equal(t, 1, el)
+	assert.Equal(t, 5, ec)
+}
+
+func TestNormaliseSelection_Reversed(t *testing.T) {
+	e := newTVE()
+	e.selAnchorLine, e.selAnchorCol = 1, 5
+	e.selLine, e.selCol = 0, 2
+
+	sl, sc, el, ec := e.normaliseSelection()
+	assert.Equal(t, 0, sl)
+	assert.Equal(t, 2, sc)
+	assert.Equal(t, 1, el)
+	assert.Equal(t, 5, ec)
+}
+
+func TestNormaliseSelection_SamePosition(t *testing.T) {
+	e := newTVE()
+	e.selAnchorLine, e.selAnchorCol = 0, 3
+	e.selLine, e.selCol = 0, 3
+
+	sl, sc, el, ec := e.normaliseSelection()
+	assert.Equal(t, 0, sl)
+	assert.Equal(t, 3, sc)
+	assert.Equal(t, 0, el)
+	assert.Equal(t, 3, ec)
+}
+
+// ── selectedText ─────────────────────────────────────────────────────────────
+
+func TestSelectedText_SameLine(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "hello world"
+	e.mu.Unlock()
+	e.selAnchorLine, e.selAnchorCol = 0, 0
+	e.selLine, e.selCol = 0, 5
+	e.hasSelection = true
+
+	assert.Equal(t, "hello", e.selectedText())
+}
+
+func TestSelectedText_MultiLine(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "line one\nline two"
+	e.mu.Unlock()
+	e.selAnchorLine, e.selAnchorCol = 0, 5
+	e.selLine, e.selCol = 1, 4
+	e.hasSelection = true
+
+	assert.Equal(t, "one\nline", e.selectedText())
+}
+
+func TestSelectedText_NoSelection(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "hello"
+	e.mu.Unlock()
+	e.hasSelection = false
+
+	assert.Equal(t, "", e.selectedText())
+}
+
+// ── deleteSelection ──────────────────────────────────────────────────────────
+
+func TestDeleteSelection_SameLine(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "hello world"
+	e.mu.Unlock()
+	e.selAnchorLine, e.selAnchorCol = 0, 6
+	e.selLine, e.selCol = 0, 11
+	e.hasSelection = true
+
+	lines := e.logicalLines()
+	lines = e.deleteSelection(lines)
+	e.commitLines(lines)
+
+	assert.Equal(t, "hello ", e.GetText())
+	assert.Equal(t, 6, e.cursorCol)
+	assert.False(t, e.hasSelection)
+}
+
+func TestDeleteSelection_MultiLine(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "line one\nline two\nline three"
+	e.mu.Unlock()
+	e.selAnchorLine, e.selAnchorCol = 0, 5
+	e.selLine, e.selCol = 2, 4
+	e.hasSelection = true
+
+	lines := e.logicalLines()
+	lines = e.deleteSelection(lines)
+	e.commitLines(lines)
+
+	assert.Equal(t, "line  three", e.GetText())
+}
+
+func TestDeleteSelection_ReversedAnchor(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "hello world"
+	e.mu.Unlock()
+	e.selAnchorLine, e.selAnchorCol = 0, 11
+	e.selLine, e.selCol = 0, 6
+	e.hasSelection = true
+
+	lines := e.logicalLines()
+	lines = e.deleteSelection(lines)
+	e.commitLines(lines)
+
+	assert.Equal(t, "hello ", e.GetText())
+}
+
+func TestDeleteSelection_NoSelection(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "hello"
+	e.mu.Unlock()
+	e.hasSelection = false
+
+	lines := e.logicalLines()
+	lines = e.deleteSelection(lines)
+	e.commitLines(lines)
+
+	assert.Equal(t, "hello", e.GetText())
+}
+
+// ── pushUndo / undo ──────────────────────────────────────────────────────────
+
+func TestPushUndo_StoresCursorPosition(t *testing.T) {
+	e := newTVE()
+	e.pushUndo("hello", 0, 3)
+
+	require.Len(t, e.undoStack, 1)
+	assert.Equal(t, "hello", e.undoStack[0].raw)
+	assert.Equal(t, 0, e.undoStack[0].cursorLine)
+	assert.Equal(t, 3, e.undoStack[0].cursorCol)
+}
+
+func TestPushUndo_StackLimit(t *testing.T) {
+	e := newTVE()
+	for i := 0; i < 110; i++ {
+		e.pushUndo("x", 0, 0)
+	}
+	assert.LessOrEqual(t, len(e.undoStack), 100)
+}
+
+func TestUndo_RestoresTextAndCursor(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "hello"
+	e.mu.Unlock()
+	e.cursorLine, e.cursorCol = 0, 5
+
+	e.pushUndo("hello", 0, 5)
+
+	e.mu.Lock()
+	e.rawFull = "hello world"
+	e.visualCacheRaw = ""
+	e.cursorLine = 0
+	e.cursorCol = 11
+	e.mu.Unlock()
+
+	e.mu.Lock()
+	undo := e.undoStack[len(e.undoStack)-1]
+	e.undoStack = e.undoStack[:len(e.undoStack)-1]
+	e.rawFull = undo.raw
+	e.visualCacheRaw = ""
+	e.cursorLine = undo.cursorLine
+	e.cursorCol = undo.cursorCol
+	e.mu.Unlock()
+
+	assert.Equal(t, "hello", e.GetText())
+	assert.Equal(t, 0, e.cursorLine)
+	assert.Equal(t, 5, e.cursorCol)
+}
+
+// ── visual cache ─────────────────────────────────────────────────────────────
+
+func TestVisualCache_InvalidatedOnCommit(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "hello"
+	e.mu.Unlock()
+
+	e.mu.Lock()
+	e.visualCache = buildVisualLines([]string{"hello"}, 80)
+	e.visualCacheRaw = "hello"
+	e.visualCacheWidth = 80
+	e.mu.Unlock()
+
+	e.commitLines([]string{"world"})
+
+	e.mu.Lock()
+	cacheRaw := e.visualCacheRaw
+	e.mu.Unlock()
+
+	assert.Equal(t, "", cacheRaw, "commitLines should invalidate visual cache")
+}
+
+func TestVisualCache_HitOnSecondCall(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "GET /foo HTTP/1.1\nHost: example.com"
+	e.visualCacheRaw = ""
+	e.mu.Unlock()
+
+	// Prime the cache manually without needing a renderer.
+	cpl := 80
+	e.mu.Lock()
+	built := buildVisualLines(splitRaw(e.rawFull), cpl)
+	e.visualCache = built
+	e.visualCacheRaw = e.rawFull
+	e.visualCacheWidth = cpl
+	e.mu.Unlock()
+
+	e.mu.Lock()
+	c1 := e.visualCache
+	c2 := e.visualCache
+	e.mu.Unlock()
+
+	require.NotEmpty(t, c1)
+	assert.Equal(t, &c1[0], &c2[0], "expected same slice on repeated access")
+}
+
+func TestVisualCache_MissAfterMutation(t *testing.T) {
+	e := newTVE()
+	e.mu.Lock()
+	e.rawFull = "hello"
+	cpl := 80
+	e.visualCache = buildVisualLines([]string{"hello"}, cpl)
+	e.visualCacheRaw = "hello"
+	e.visualCacheWidth = cpl
+	e.mu.Unlock()
+
+	e.commitLines([]string{"world"})
+
+	e.mu.Lock()
+	cacheRaw := e.visualCacheRaw
+	e.mu.Unlock()
+
+	assert.Equal(t, "", cacheRaw, "cache should be invalidated after mutation")
+}
+
+// ── commitLines ──────────────────────────────────────────────────────────────
+
+func TestCommitLines_UpdatesText(t *testing.T) {
+	e := newTVE()
+	e.commitLines([]string{"new text"})
+	assert.Equal(t, "new text", e.GetText())
+}
+
+func TestCommitLines_MultiLine(t *testing.T) {
+	e := newTVE()
+	e.commitLines([]string{"line one", "line two"})
+	assert.Equal(t, "line one\nline two", e.GetText())
+}