testsuite: Add some make test cases.

test/fixtures/make/Makefile

@@ -0,0 +1,16 @@
+NAME := sample
+
+.PHONY: all
+all: $(NAME)
+
+$(NAME): sample.c
+	cc -o $@ $^
+
+.PHONY: install
+install: all
+	mkdir -p /usr/bin
+	install -m 755 $(NAME) /usr/bin
+
+.PHONY: clean
+clean:
+	-rm -f $(NAME)

test/fixtures/make/sample.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(void)
+{
+	puts("Hello, world!");
+	return 0;
+}

test/lib/completions/make.exp

@@ -4,14 +4,33 @@ proc setup {} {
 
 
 proc teardown {} {
-    assert_env_unmodified
+    assert_env_unmodified {/OLDPWD=/d}
 }
 
 
 setup
 
 
-assert_complete_any "make "
+set test "-f Ma<TAB> should complete \"Makefile\""
+set dir $::srcdir/fixtures/make
+assert_complete_dir "Makefile" "make -f Ma" $dir $test
+
+
+sync_after_int
+
+
+set test "\"make <TAB>\" should complete targets"
+set dir $::srcdir/fixtures/make
+set targets "all sample install clean"
+assert_complete_dir $targets "make " $dir $test
+
+
+sync_after_int
+
+
+set test "\"make <TAB>\" should not show anything in directory without makefile"
+set dir $::srcdir/fixtures/make/empty_dir
+assert_complete_dir "" "make " $dir $test
 
 
 sync_after_int