Port most of the invocation tests to littlecheck

This is a bit weird sometimes, e.g. to test the return status (that
fish actually *returns $status*), we use a #RUN line with %fish
invoking %fish, so we can use the substitution.

Still much nicer.

The missing scripts are those that rely on config.

tests/checks/command-1.fish

@@ -0,0 +1,2 @@
+#RUN: %fish -c "echo 1.2.3.4."
+# CHECK: 1.2.3.4.

tests/checks/command-2.fish

@@ -0,0 +1,3 @@
+#RUN: %fish -c "echo 1.2.3.4." -c "echo 5.6.7.8."
+# CHECK: 1.2.3.4.
+# CHECK: 5.6.7.8.

tests/checks/command-vars-persist.fish

@@ -0,0 +1,2 @@
+#RUN: %fish -c 'set foo bar' -c 'echo $foo'
+# CHECK: bar

tests/checks/features-nocaret1.fish

@@ -0,0 +1,2 @@
+#RUN: %fish --features 'no-stderr-nocaret' -c 'status test-feature stderr-nocaret; echo nocaret: $status'
+# CHECK: nocaret: 1

tests/checks/features-nocaret2.fish

@@ -0,0 +1,2 @@
+#RUN: %fish --features    'stderr-nocaret' -c 'status test-feature stderr-nocaret; echo nocaret: $status'
+# CHECK: nocaret: 0

tests/checks/features-nocaret3.fish

@@ -0,0 +1,2 @@
+#RUN: %fish --features 'no-stderr-nocaret' -c 'echo -n careton:; echo ^/dev/null'
+# CHECK: careton:

tests/checks/features-nocaret4.fish

@@ -0,0 +1,2 @@
+#RUN: %fish --features '   stderr-nocaret' -c 'echo -n "caretoff: "; echo ^/dev/null'
+# CHECK: caretoff: ^/dev/null

tests/checks/features-qmark2.fish

@@ -0,0 +1,2 @@
+#RUN: %fish --features 'qmark-noglob' -C 'string match --quiet "??" ab ; echo "qmarkoff: $status"'
+# CHECK: qmarkoff: 1

tests/checks/features-string-backslashes-off.fish

@@ -0,0 +1,2 @@
+#RUN: %fish --features 'no-string-replace-fewer-backslashes' -C 'string replace -ra "\\\\" "\\\\\\\\" -- "a\b\c"'
+# CHECK: a\b\c

tests/checks/features-string-backslashes.fish

@@ -0,0 +1,2 @@
+#RUN: %fish --features 'string-replace-fewer-backslashes' -C 'string replace -ra "\\\\" "\\\\\\\\" -- "a\b\c"'
+# CHECK: a\\b\\c

tests/checks/init-command-2.fish

@@ -0,0 +1,3 @@
+#RUN: %fish -C 'echo init-command' -C 'echo 2nd init-command'
+# CHECK: init-command
+# CHECK: 2nd init-command

tests/checks/init-command-mix-ordering.fish

@@ -0,0 +1,3 @@
+#RUN: %fish -c 'echo command' -C 'echo init-command'
+# CHECK: init-command
+# CHECK: command

tests/checks/init-command-mix.fish

@@ -0,0 +1,3 @@
+#RUN: %fish -C 'echo init-command' -c 'echo command'
+# CHECK: init-command
+# CHECK: command

tests/checks/init-command.fish

@@ -0,0 +1,2 @@
+#RUN: %fish -C 'echo init-command'
+# CHECK: init-command

tests/checks/interactive.fish

@@ -0,0 +1,3 @@
+#RUN: %fish -c 'if status --is-login ; echo login shell ; else ; echo not login shell ; end; if status --is-interactive ; echo interactive ; else ; echo not interactive ; end' -i
+# CHECK: not login shell
+# CHECK: interactive

tests/checks/invocation.fish

@@ -0,0 +1,2 @@
+#RUN: %fish -c "echo 1.2.3.4."
+# CHECK: 1.2.3.4.

tests/checks/login-interactive.fish

@@ -0,0 +1,3 @@
+#RUN: %fish -c 'if status --is-login ; echo login shell ; else ; echo not login shell ; end; if status --is-interactive ; echo interactive ; else ; echo not interactive ; end' -l -i
+# CHECK: login shell
+# CHECK: interactive

tests/checks/login.fish

@@ -0,0 +1,3 @@
+#RUN: %fish -c 'if status --is-login ; echo login shell ; else ; echo not login shell ; end; if status --is-interactive ; echo interactive ; else ; echo not interactive ; end' -l
+# CHECK: login shell
+# CHECK: not interactive

tests/checks/no-login-no-interactive.fish

@@ -0,0 +1,4 @@
+#RUN: %fish -c 'if status --is-login ; echo login shell ; else ; echo not login shell ; end; if status --is-interactive ; echo interactive ; else ; echo not interactive ; end'
+
+# CHECK: not login shell
+# CHECK: not interactive

tests/checks/rc-returned.fish

@@ -0,0 +1,2 @@
+#RUN: %fish -c '%fish -c false; echo RC: $status'
+# CHECK: RC: 1

tests/checks/version.fish

@@ -0,0 +1,2 @@
+#RUN: %fish -v
+# CHECK: fish, version {{[-.ga-f0-9]*(irty)?}}