Raise an exception on end of input in CliRunner

CHANGES.rst

@@ -7,6 +7,7 @@ Version 8.2.1
     :issue:`2897` :pr:`2930`
 -   Fix shell completion for nested groups. :issue:`2906` :pr:`2907`
 -   Flush ``sys.stderr`` at the end of ``CliRunner.invoke``. :issue:`2682`
+-   Fix EOF handling for stdin input in CliRunner. :issue:`2787`
 
 Version 8.2.0
 -------------

src/click/testing.py

@@ -116,6 +116,13 @@ def name(self) -> str:
     def mode(self) -> str:
         return self._mode
 
+    def __next__(self) -> str:  # type: ignore
+        try:
+            line = super().__next__()
+        except StopIteration as e:
+            raise EOFError() from e
+        return line
+
 
 def make_input_stream(
     input: str | bytes | t.IO[t.Any] | None, charset: str
@@ -341,7 +348,7 @@ def isolation(
         @_pause_echo(echo_input)  # type: ignore
         def visible_input(prompt: str | None = None) -> str:
             sys.stdout.write(prompt or "")
-            val = text_input.readline().rstrip("\r\n")
+            val = next(text_input).rstrip("\r\n")
             sys.stdout.write(f"{val}\n")
             sys.stdout.flush()
             return val
@@ -350,7 +357,7 @@ def visible_input(prompt: str | None = None) -> str:
         def hidden_input(prompt: str | None = None) -> str:
             sys.stdout.write(f"{prompt or ''}\n")
             sys.stdout.flush()
-            return text_input.readline().rstrip("\r\n")
+            return next(text_input).rstrip("\r\n")
 
         @_pause_echo(echo_input)  # type: ignore
         def _getchar(echo: bool) -> str:

tests/test_chain.py

@@ -163,8 +163,8 @@ def processor(iterator):
         return processor
 
     result = runner.invoke(cli, args, input=input)
-    assert not result.exception
-    assert result.output.splitlines() == expect
+    # last two lines are '' and 'Aborted!'
+    assert result.output.splitlines()[:-2] == expect
 
 
 def test_args_and_chain(runner):

tests/test_termui.py

@@ -242,7 +242,7 @@ def test_file_prompt_default_format(runner, file_kwargs):
     def cli(f):
         click.echo(f.name)
 
-    result = runner.invoke(cli)
+    result = runner.invoke(cli, input="\n")
     assert result.output == f"file [{__file__}]: \n{__file__}\n"
 
 
@@ -451,7 +451,7 @@ def cli(value, o):
     [
         (True, "password\npassword", None, "password"),
         ("Confirm Password", "password\npassword\n", None, "password"),
-        (True, "", "", ""),
+        (True, "\n\n", "", ""),
         (False, None, None, None),
     ],
 )

tests/test_utils.py

@@ -179,6 +179,19 @@ def f(_):
     assert out == "Password:\ninterrupted\n"
 
 
+def test_prompts_eof(runner):
+    """If too few lines of input are given, prompt should exit, not hang."""
+
+    @click.command
+    def echo():
+        for _ in range(3):
+            click.echo(click.prompt("", type=int))
+
+    # only provide two lines of input for three prompts
+    result = runner.invoke(echo, input="1\n2\n")
+    assert result.exit_code == 1
+
+
 def _test_gen_func():
     yield "a"
     yield "b"