Fixup tests

tests/groups.rs

@@ -45,8 +45,13 @@ fn required_group_missing_arg() {
     assert_eq!(err.kind, ErrorKind::MissingRequiredArgument);
 }
 
+// This tests a programmer error and will only succeed with debug_assertions
+// #[cfg(debug_assertions)]
 #[test]
-#[should_panic]
+// This used to provide a nice, programmer-friendly error.
+// Now the error directs the programmer to file a bug report with clap.
+// #[should_panic(expected = "The group 'req' contains the arg 'flg' that doesn't actually exist.")]
+#[should_panic(expected = "internal error")]
 fn non_existing_arg() {
     let _ = App::new("group")
         .arg("-f, --flag 'some flag'")

tests/help.rs

@@ -4,7 +4,7 @@ extern crate regex;
 
 include!("../clap-test.rs");
 
-use clap::{App, AppSettings, Arg, ArgSettings, ErrorKind};
+use clap::{App, AppSettings, Arg, ArgGroup, ArgSettings, ErrorKind};
 
 static REQUIRE_DELIM_HELP: &'static str = "test 1.3
 Kevin K.
@@ -532,6 +532,22 @@ OPTIONS:
 NETWORKING:
     -n, --no-proxy    Do not use system proxy settings";
 
+static ISSUE_1487: &'static str = "test 
+
+USAGE:
+    ctest <arg1|arg2>
+
+ARGS:
+    <arg1>    
+    <arg2>    
+
+FLAGS:
+    -h, --help       Prints help information
+    -V, --version    Prints version information
+";
+
+
+
 fn setup() -> App<'static> {
     App::new("test")
         .author("Kevin K.")
@@ -1505,3 +1521,16 @@ fn show_short_about_issue_897() {
         false
     ));
 }
+
+#[test]
+fn issue_1487() {
+    let app = App::new("test")
+        .arg(Arg::with_name("arg1")
+            .group("group1"))
+        .arg(Arg::with_name("arg2")
+            .group("group1"))
+        .group(ArgGroup::with_name("group1")
+            .args(&["arg1", "arg2"])
+            .required(true));
+    assert!(test::compare_output(app, "ctest -h", ISSUE_1487, false));
+} 

tests/multiple_values.rs

@@ -963,8 +963,13 @@ fn req_delimiter_complex() {
     );
 }
 
+// This tests a programmer error and will only succeed with debug_assertions
+#[cfg(debug_assertions)]
 #[test]
-#[should_panic]
+#[should_panic(expected = "When using a positional argument with \
+.multiple(true) that is *not the last* positional argument, the last \
+positional argument (i.e the one with the highest index) *must* have \
+.required(true) or .last(true) set.")]
 fn low_index_positional_not_required() {
     let _ = App::new("lip")
         .arg(
@@ -974,11 +979,14 @@ fn low_index_positional_not_required() {
                 .multiple(true),
         )
         .arg(Arg::with_name("target").index(2))
-        .try_get_matches_from(vec!["lip", "file1", "file2", "file3", "target"]);
+        .try_get_matches_from(vec![""]);
 }
 
+// This tests a programmer error and will only succeed with debug_assertions
+#[cfg(debug_assertions)]
 #[test]
-#[should_panic]
+#[should_panic(expected = "Only one positional argument with .multiple(true) \
+set is allowed per command, unless the second one also has .last(true) set")]
 fn low_index_positional_last_multiple_too() {
     let _ = App::new("lip")
         .arg(
@@ -993,11 +1001,14 @@ fn low_index_positional_last_multiple_too() {
                 .required(true)
                 .multiple(true),
         )
-        .try_get_matches_from(vec!["lip", "file1", "file2", "file3", "target"]);
+        .try_get_matches_from(vec![""]);
 }
 
+// This tests a programmer error and will only succeed with debug_assertions
+#[cfg(debug_assertions)]
 #[test]
-#[should_panic]
+#[should_panic(expected = "Only the last positional argument, or second to \
+last positional argument may be set to .multiple(true)")]
 fn low_index_positional_too_far_back() {
     let _ = App::new("lip")
         .arg(
@@ -1008,7 +1019,7 @@ fn low_index_positional_too_far_back() {
         )
         .arg(Arg::with_name("target").required(true).index(2))
         .arg(Arg::with_name("target2").required(true).index(3))
-        .try_get_matches_from(vec!["lip", "file1", "file2", "file3", "target"]);
+        .try_get_matches_from(vec![""]);
 }
 
 #[test]

tests/positionals.rs

@@ -218,15 +218,16 @@ fn single_positional_required_usage_string() {
     assert_eq!(app.generate_usage(), "USAGE:\n    test <FILE>");
 }
 
+// This tests a programmer error and will only succeed with debug_assertions
+#[cfg(debug_assertions)]
 #[test]
-#[should_panic]
+#[should_panic(expected = "Found positional argument which is not required \
+with a lower index than a required positional argument")]
 fn missing_required() {
-    let r = App::new("test")
+    let _ = App::new("test")
         .arg("[FILE1] 'some file'")
         .arg("<FILE2> 'some file'")
-        .try_get_matches_from(vec!["test", "file"]);
-    assert!(r.is_err());
-    assert_eq!(r.unwrap_err().kind, ErrorKind::MissingRequiredArgument);
+        .try_get_matches_from(vec![""]);
 }
 
 #[test]

tests/unique_args.rs

@@ -2,19 +2,23 @@ extern crate clap;
 
 use clap::{App, Arg};
 
+// This tests a programmer error and will only succeed with debug_assertions
+#[cfg(debug_assertions)]
 #[test]
-#[should_panic]
+#[should_panic(expected = "Arg names must be unique")]
 fn unique_arg_names() {
     let _ = App::new("some")
         .args(&[
-            Arg::with_name("arg").short('a'),
-            Arg::with_name("arg").short('b'),
+            Arg::with_name("arg1").short('a'),
+            Arg::with_name("arg1").short('b'),
         ])
         .try_get_matches();
 }
 
+// This tests a programmer error and will only succeed with debug_assertions
+#[cfg(debug_assertions)]
 #[test]
-#[should_panic]
+#[should_panic(expected = "Argument short must be unique")]
 fn unique_arg_shorts() {
     let _ = App::new("some")
         .args(&[
@@ -24,8 +28,10 @@ fn unique_arg_shorts() {
         .try_get_matches();
 }
 
+// This tests a programmer error and will only succeed with debug_assertions
+#[cfg(debug_assertions)]
 #[test]
-#[should_panic]
+#[should_panic(expected = "Argument long must be unique")]
 fn unique_arg_longs() {
     let _ = App::new("some")
         .args(&[