diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index 11ca288..3097daf 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -162,21 +162,44 @@
   call assert_equal('  +123', printf('%+6d', 123))
   call assert_equal('   123', printf('% 6d', 123))
   call assert_equal('  -123', printf('% 6d', -123))
+
+  " Test left adjusted.
+  call assert_equal('123   ', printf('%-6d', 123))
   call assert_equal('+123  ', printf('%-+6d', 123))
   call assert_equal(' 123  ', printf('%- 6d', 123))
   call assert_equal('-123  ', printf('%- 6d', -123))
 
+  call assert_equal('  00123', printf('%7.5d', 123))
+  call assert_equal(' -00123', printf('%7.5d', -123))
+  call assert_equal(' +00123', printf('%+7.5d', 123))
+  " Precision field should not be used when combined with %0
+  call assert_equal('  00123', printf('%07.5d', 123))
+  call assert_equal(' -00123', printf('%07.5d', -123))
+
+  call assert_equal('  123', printf('%*d', 5, 123))
+  call assert_equal('123  ', printf('%*d', -5, 123))
   call assert_equal('00123', printf('%.*d', 5, 123))
   call assert_equal('  123', printf('% *d', 5, 123))
   call assert_equal(' +123', printf('%+ *d', 5, 123))
 
-  call assert_equal('123  ', printf('%-5d', 123))
+  " Simple quote (thousand grouping char) is ignored.
+  call assert_equal('+00123456', printf("%+'09d", 123456))
+
+  " Unrecognized format specifier kept as-is.
+  call assert_equal('_123', printf("%_%d", 123))
+
+  " Test alternate forms.
   call assert_equal('0x7b', printf('%#x', 123))
   call assert_equal('0X7B', printf('%#X', 123))
   call assert_equal('0173', printf('%#o', 123))
   call assert_equal('0173', printf('%#O', 123))
   call assert_equal('abc', printf('%#s', 'abc'))
   call assert_equal('abc', printf('%#S', 'abc'))
+  call assert_equal('  0173', printf('%#6o', 123))
+  call assert_equal(' 00173', printf('%#6.5o', 123))
+  call assert_equal('  0173', printf('%#6.2o', 123))
+  call assert_equal('  0173', printf('%#6.2o', 123))
+  call assert_equal('0173', printf('%#2.2o', 123))
 
   call assert_equal(' 00123', printf('%6.5d', 123))
   call assert_equal(' 0007b', printf('%6.5x', 123))
@@ -201,6 +224,7 @@
 
 function Test_printf_float()
   if has('float')
+    call assert_equal('1.000000', printf('%f', 1))
     call assert_equal('1.230000', printf('%f', 1.23))
     call assert_equal('1.230000', printf('%F', 1.23))
     call assert_equal('9999999.9', printf('%g', 9999999.9))
@@ -215,10 +239,31 @@
     call assert_equal('  0.33', printf('%6.2f', 1.0/3.0))
     call assert_equal(' -0.33', printf('%6.2f', -1.0/3.0))
     call assert_equal('000.33', printf('%06.2f', 1.0/3.0))
-    " FIXME: call assert_equal('-00.33', printf('%06.2f', -1.0/3.0))
-    " FIXME: call assert_equal('-00.33', printf('%+06.2f', -1.0/3.0))
-    " FIXME: call assert_equal('+00.33', printf('%+06.2f', 1.0/3.0))
-    " FIXME: call assert_equal(' 00.33', printf('% 06.2f', 1.0/3.0))
+    call assert_equal('-00.33', printf('%06.2f', -1.0/3.0))
+    call assert_equal('-00.33', printf('%+06.2f', -1.0/3.0))
+    call assert_equal('+00.33', printf('%+06.2f', 1.0/3.0))
+    call assert_equal(' 00.33', printf('% 06.2f', 1.0/3.0))
+    call assert_equal('000.33', printf('%06.2g', 1.0/3.0))
+    call assert_equal('-00.33', printf('%06.2g', -1.0/3.0))
+    call assert_equal('0.33', printf('%3.2f', 1.0/3.0))
+    call assert_equal('003.33e-01', printf('%010.2e', 1.0/3.0))
+    call assert_equal(' 03.33e-01', printf('% 010.2e', 1.0/3.0))
+    call assert_equal('+03.33e-01', printf('%+010.2e', 1.0/3.0))
+    call assert_equal('-03.33e-01', printf('%010.2e', -1.0/3.0))
+
+    " When precision is 0, the dot should be omitted.
+    call assert_equal('  2', printf('%3.f', 7.0/3.0))
+    call assert_equal('  2', printf('%3.g', 7.0/3.0))
+    call assert_equal('  2e+00', printf('%7.e', 7.0/3.0))
+
+    " Float zero can be signed.
+    call assert_equal('+0.000000', printf('%+f', 0.0))
+    call assert_equal('0.000000', printf('%f', 1.0/(1.0/0.0)))
+    call assert_equal('-0.000000', printf('%f', 1.0/(-1.0/0.0)))
+    call assert_equal('0.0', printf('%s', 1.0/(1.0/0.0)))
+    call assert_equal('-0.0', printf('%s', 1.0/(-1.0/0.0)))
+    call assert_equal('0.0', printf('%S', 1.0/(1.0/0.0)))
+    call assert_equal('-0.0', printf('%S', 1.0/(-1.0/0.0)))
 
     " Float infinity can be signed.
     call assert_equal('inf', printf('%f', 1.0/0.0))
@@ -227,6 +272,8 @@
     call assert_equal('-inf', printf('%g', -1.0/0.0))
     call assert_equal('inf', printf('%e', 1.0/0.0))
     call assert_equal('-inf', printf('%e', -1.0/0.0))
+    call assert_equal('INF', printf('%F', 1.0/0.0))
+    call assert_equal('-INF', printf('%F', -1.0/0.0))
     call assert_equal('INF', printf('%E', 1.0/0.0))
     call assert_equal('-INF', printf('%E', -1.0/0.0))
     call assert_equal('INF', printf('%E', 1.0/0.0))
@@ -245,6 +292,9 @@
     call assert_equal('-inf  ', printf('%-6f', -1.0/0.0))
     call assert_equal('+inf  ', printf('%-+6f', 1.0/0.0))
     call assert_equal(' inf  ', printf('%- 6f', 1.0/0.0))
+    call assert_equal('-INF  ', printf('%-6F', -1.0/0.0))
+    call assert_equal('+INF  ', printf('%-+6F', 1.0/0.0))
+    call assert_equal(' INF  ', printf('%- 6F', 1.0/0.0))
     call assert_equal('INF   ', printf('%-6G', 1.0/0.0))
     call assert_equal('-INF  ', printf('%-6G', -1.0/0.0))
     call assert_equal('INF   ', printf('%-6E', 1.0/0.0))
@@ -252,22 +302,16 @@
     call assert_equal('inf', printf('%s', 1.0/0.0))
     call assert_equal('-inf', printf('%s', -1.0/0.0))
 
-    " Float zero can be signed.
-    call assert_equal('0.000000', printf('%f', 1.0/(1.0/0.0)))
-    call assert_equal('-0.000000', printf('%f', 1.0/(-1.0/0.0)))
-    call assert_equal('0.0', printf('%s', 1.0/(1.0/0.0)))
-    call assert_equal('-0.0', printf('%s', 1.0/(-1.0/0.0)))
-    call assert_equal('0.0', printf('%S', 1.0/(1.0/0.0)))
-    call assert_equal('-0.0', printf('%S', 1.0/(-1.0/0.0)))
-
     " Float nan (not a number) has no sign.
     call assert_equal('nan', printf('%f', sqrt(-1.0)))
     call assert_equal('nan', printf('%f', 0.0/0.0))
     call assert_equal('nan', printf('%f', -0.0/0.0))
     call assert_equal('nan', printf('%g', 0.0/0.0))
     call assert_equal('nan', printf('%e', 0.0/0.0))
+    call assert_equal('NAN', printf('%F', 0.0/0.0))
     call assert_equal('NAN', printf('%G', 0.0/0.0))
     call assert_equal('NAN', printf('%E', 0.0/0.0))
+    call assert_equal('NAN', printf('%F', -0.0/0.0))
     call assert_equal('NAN', printf('%G', -0.0/0.0))
     call assert_equal('NAN', printf('%E', -0.0/0.0))
     call assert_equal('   nan', printf('%6f', 0.0/0.0))