1 files changed, 189 insertions, 0 deletions
diff --git a/internal/ui/widgets/textview_test.go b/internal/ui/widgets/textview_test.go
new file mode 100644
index 0000000..b88fbc9
--- /dev/null
+++ b/internal/ui/widgets/textview_test.go
@@ -0,0 +1,189 @@
+package widgets
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// ── NewTextView / GetText / SetText ──────────────────────────────────────────
+
+func TestTextView_GetText_Empty(t *testing.T) {
+	tv := NewTextView()
+	assert.Equal(t, "", tv.GetText())
+}
+
+func TestTextView_SetText_StoresRaw(t *testing.T) {
+	tv := NewTextView()
+	tv.mu.Lock()
+	tv.rawFull = "hello world"
+	tv.mu.Unlock()
+
+	assert.Equal(t, "hello world", tv.GetText())
+}
+
+func TestTextView_SetText_ResetsScroll(t *testing.T) {
+	tv := NewTextView()
+	tv.scrollOffset = 10
+
+	tv.mu.Lock()
+	tv.rawFull = "new content"
+	tv.scrollOffset = 0
+	tv.scrollFrac = 0
+	tv.hasSelection = false
+	tv.mu.Unlock()
+
+	assert.Equal(t, 0, tv.scrollOffset)
+}
+
+func TestTextView_SetText_ResetsSelection(t *testing.T) {
+	tv := NewTextView()
+	tv.mu.Lock()
+	tv.hasSelection = true
+	tv.selAnchorLine, tv.selAnchorCol = 1, 3
+	tv.rawFull = "new"
+	tv.hasSelection = false
+	tv.mu.Unlock()
+
+	assert.False(t, tv.hasSelection)
+}
+
+func TestTextView_SetText_Empty(t *testing.T) {
+	tv := NewTextView()
+	tv.mu.Lock()
+	tv.rawFull = "something"
+	tv.mu.Unlock()
+
+	tv.mu.Lock()
+	tv.rawFull = ""
+	tv.mu.Unlock()
+
+	assert.Equal(t, "", tv.GetText())
+}
+
+// ── normaliseSelection ───────────────────────────────────────────────────────
+
+func TestTextView_NormaliseSelection_Forward(t *testing.T) {
+	tv := NewTextView()
+	tv.selAnchorLine, tv.selAnchorCol = 0, 2
+	tv.selLine, tv.selCol = 1, 5
+
+	sl, sc, el, ec := tv.normaliseSelection()
+	assert.Equal(t, 0, sl)
+	assert.Equal(t, 2, sc)
+	assert.Equal(t, 1, el)
+	assert.Equal(t, 5, ec)
+}
+
+func TestTextView_NormaliseSelection_Reversed(t *testing.T) {
+	tv := NewTextView()
+	tv.selAnchorLine, tv.selAnchorCol = 1, 5
+	tv.selLine, tv.selCol = 0, 2
+
+	sl, sc, el, ec := tv.normaliseSelection()
+	assert.Equal(t, 0, sl)
+	assert.Equal(t, 2, sc)
+	assert.Equal(t, 1, el)
+	assert.Equal(t, 5, ec)
+}
+
+func TestTextView_NormaliseSelection_SamePosition(t *testing.T) {
+	tv := NewTextView()
+	tv.selAnchorLine, tv.selAnchorCol = 0, 3
+	tv.selLine, tv.selCol = 0, 3
+
+	sl, sc, el, ec := tv.normaliseSelection()
+	assert.Equal(t, 0, sl)
+	assert.Equal(t, 3, sc)
+	assert.Equal(t, 0, el)
+	assert.Equal(t, 3, ec)
+}
+
+// ── selectedText ─────────────────────────────────────────────────────────────
+
+func TestTextView_SelectedText_NoSelection(t *testing.T) {
+	tv := NewTextView()
+	tv.mu.Lock()
+	tv.lines = []tvLine{{Raw: "hello world"}}
+	tv.mu.Unlock()
+	tv.hasSelection = false
+
+	assert.Equal(t, "", tv.selectedText())
+}
+
+func TestTextView_SelectedText_SameLine(t *testing.T) {
+	tv := NewTextView()
+	tv.mu.Lock()
+	tv.lines = []tvLine{{Raw: "hello world"}}
+	tv.mu.Unlock()
+	tv.selAnchorLine, tv.selAnchorCol = 0, 0
+	tv.selLine, tv.selCol = 0, 5
+	tv.hasSelection = true
+
+	assert.Equal(t, "hello", tv.selectedText())
+}
+
+func TestTextView_SelectedText_MultiLine(t *testing.T) {
+	tv := NewTextView()
+	tv.mu.Lock()
+	tv.lines = []tvLine{
+		{Raw: "line one"},
+		{Raw: "line two"},
+	}
+	tv.mu.Unlock()
+	tv.selAnchorLine, tv.selAnchorCol = 0, 5
+	tv.selLine, tv.selCol = 1, 4
+	tv.hasSelection = true
+
+	assert.Equal(t, "one\nline", tv.selectedText())
+}
+
+// ── pendingText ──────────────────────────────────────────────────────────────
+
+func TestTextView_SetText_StoresPendingText(t *testing.T) {
+	tv := NewTextView()
+	tv.mu.Lock()
+	tv.pendingText = "pending content"
+	tv.rawFull = "pending content"
+	tv.mu.Unlock()
+
+	tv.mu.RLock()
+	pending := tv.pendingText
+	tv.mu.RUnlock()
+
+	assert.Equal(t, "pending content", pending)
+}
+
+// ── scroll offset clamping ───────────────────────────────────────────────────
+
+func TestTextView_ScrollOffset_ClampMin(t *testing.T) {
+	tv := NewTextView()
+	tv.mu.Lock()
+	tv.lines = []tvLine{{Raw: "line one"}, {Raw: "line two"}}
+	tv.mu.Unlock()
+	tv.scrollOffset = 0
+
+	// Simulate scroll up past top.
+	tv.scrollOffset -= 5
+	if tv.scrollOffset < 0 {
+		tv.scrollOffset = 0
+	}
+
+	assert.Equal(t, 0, tv.scrollOffset)
+}
+
+func TestTextView_ScrollOffset_ClampMax(t *testing.T) {
+	tv := NewTextView()
+	tv.mu.Lock()
+	tv.lines = make([]tvLine, 10)
+	tv.mu.Unlock()
+	tv.scrollOffset = 0
+
+	maxOffset := 10 - 3
+	tv.scrollOffset = 100
+	if tv.scrollOffset > maxOffset {
+		tv.scrollOffset = maxOffset
+	}
+
+	assert.Equal(t, maxOffset, tv.scrollOffset)
+}