Port "test1" to littlecheck

This, together with the other testX, really just tests some basic
syntax. So let's just call it "basic".

Note that this file uses escaped newlines on purpose, so restyling it
would currently break it. I'm not sure what the best thing to do here is.

tests/checks/basic.fish

@@ -0,0 +1,174 @@
+#RUN: %fish %s
+#
+# Test function, loops, conditionals and some basic elements
+#
+
+# Comments in odd places don't cause problems
+for i in 1 2 # Comment on same line as command
+# Comment inside loop
+    for j in a b
+		# Double loop
+        echo $i$j
+	end;
+end
+#CHECK: 1a
+#CHECK: 1b
+#CHECK: 2a
+#CHECK: 2b
+
+# Escaped newlines
+echo foo\ bar
+echo foo\
+bar
+echo "foo\
+bar"
+echo 'foo\
+bar'
+#CHECK: foo bar
+#CHECK: foobar
+#CHECK: foobar
+#CHECK: foo\
+#CHECK: bar
+
+for i in \
+    a b c
+    echo $i
+end
+#CHECK: a
+#CHECK: b
+#CHECK: c
+
+
+# Simple function tests
+
+function foo
+    echo >../test/temp/fish_foo.txt $argv
+end
+
+foo hello
+
+cat ../test/temp/fish_foo.txt |read foo
+
+if test $foo = hello;
+  echo Test 2 pass
+else
+  echo Test 2 fail
+end
+#CHECK: Test 2 pass
+
+function foo
+    printf 'Test %s' $argv[1]; echo ' pass'
+end
+
+foo 3a
+#CHECK: Test 3a pass
+
+for i in Test for continue break and switch builtins problems;
+	switch $i
+		case Test
+			printf "%s " $i
+		case "for"
+			printf "%s " 3b
+		case "c*"
+			echo pass
+		case break
+			continue
+			echo fail
+		case and
+			break
+			echo fail
+		case "*"
+			echo fail
+	end
+end
+#CHECK: Test 3b pass
+
+set -l sta
+if eval true
+	if eval false
+		set sta fail
+	else
+		set sta pass
+	end
+else
+	set sta fail
+end
+echo Test 4 $sta
+#CHECK: Test 4 pass
+
+# Testing builtin status
+
+function test_builtin_status
+	return 1
+end
+test_builtin_status
+if [ $status -eq 1 ]
+	set sta pass
+else
+	set sta fail
+end
+echo Test 5 $sta
+#CHECK: Test 5 pass
+
+####################
+# echo tests
+echo 'abc\ndef'
+#CHECK: abc\ndef
+echo -e 'abc\ndef'
+#CHECK: abc
+#CHECK: def
+echo -e 'abc\zdef'
+#CHECK: abc\zdef
+echo -e 'abc\41def'
+echo -e 'abc\041def'
+#CHECK: abc!def
+#CHECK: abc!def
+echo -e 'abc\121def'
+echo -e 'abc\1212def'
+#CHECK: abcQdef
+#CHECK: abcQ2def
+echo -e 'abc\cdef' # won't output a newline!
+#CHECK: abc
+echo ''
+echo -
+#CHECK: -
+echo -h
+#CHECK: -h
+echo -ne '\376' | display_bytes
+#CHECK: 0000000 376
+#CHECK: 0000001
+echo -e 'abc\x21def'
+echo -e 'abc\x211def'
+#CHECK: abc!def
+#CHECK: abc!1def
+
+# Comments allowed in between lines (#1987)
+echo before comment \
+  # comment
+  after comment
+#CHECK: before comment after comment
+
+# Backslashes are part of comments and do not join lines (#1255)
+# This should execute false, not echo it
+echo -n # comment\
+false
+
+function always_fails
+    if true
+        return 1
+    end
+end
+
+# Verify $argv set correctly in sourced scripts (#139)
+echo 'echo "source argv {$argv}"' | source
+#CHECK: source argv {}
+echo 'echo "source argv {$argv}"' | source -
+#CHECK: source argv {}
+echo 'echo "source argv {$argv}"' | source - abc
+#CHECK: source argv {abc}
+echo 'echo "source argv {$argv}"' | source - abc def
+#CHECK: source argv {abc def}
+
+always_fails
+echo $status
+#CHECK: 1