test+docs: add editor tests; document HEXAI_EDITOR/EDITOR and Custom prompt; seam client in CLI for tests

1 files changed, 39 insertions, 0 deletions

diff --git a/internal/editor/editor_test.go b/internal/editor/editor_test.go
new file mode 100644
index 0000000..df6dec7
--- /dev/null
+++ b/internal/editor/editor_test.go
@@ -0,0 +1,39 @@
+package editor
+
+import (
+    "os"
+    "path/filepath"
+    "testing"
+)
+
+func TestResolve_EnvPriority(t *testing.T) {
+    t.Setenv("HEXAI_EDITOR", "ed1")
+    t.Setenv("EDITOR", "ed2")
+    ed, err := Resolve()
+    if err != nil || ed != "ed1" {
+        t.Fatalf("Resolve failed: %v %q", err, ed)
+    }
+    t.Setenv("HEXAI_EDITOR", "")
+    ed, err = Resolve()
+    if err != nil || ed != "ed2" {
+        t.Fatalf("Resolve fallback failed: %v %q", err, ed)
+    }
+}
+
+func TestOpenTempAndEdit_UsesRunEditor(t *testing.T) {
+    old := RunEditor
+    t.Cleanup(func(){ RunEditor = old })
+    // Ensure Resolve() succeeds
+    t.Setenv("HEXAI_EDITOR", "dummy")
+    var capturedPath string
+    RunEditor = func(editor, path string) error {
+        capturedPath = path
+        // simulate user writing content
+        return os.WriteFile(path, []byte("Hello\nWorld\n"), 0o600)
+    }
+    out, err := OpenTempAndEdit([]byte("# Start\n\n"))
+    if err != nil { t.Fatalf("OpenTempAndEdit: %v", err) }
+    if out != "Hello\nWorld" { t.Fatalf("unexpected content: %q", out) }
+    if filepath.Ext(capturedPath) != ".md" { t.Fatalf("expected .md suffix: %s", capturedPath) }
+}
+