12 files changed, 118 insertions, 0 deletions
diff --git a/t/t4018/fortran-block-data b/t/t4018/fortran-block-data
new file mode 100644
index 0000000000..63d4e21d0a
--- /dev/null
+++ b/t/t4018/fortran-block-data
@@ -0,0 +1,5 @@
+       BLOCK DATA RIGHT
+       
+       COMMON /B/ C, ChangeMe
+       DATA C, ChangeMe  / 2.0, 6.0 / 
+       END 
diff --git a/t/t4018/fortran-comment b/t/t4018/fortran-comment
new file mode 100644
index 0000000000..7b10d17658
--- /dev/null
+++ b/t/t4018/fortran-comment
@@ -0,0 +1,13 @@
+      module a
+
+      contains
+
+      ! subroutine wrong
+      subroutine RIGHT
+      ! subroutine wrong
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/t/t4018/fortran-comment-keyword b/t/t4018/fortran-comment-keyword
new file mode 100644
index 0000000000..e9206a5379
--- /dev/null
+++ b/t/t4018/fortran-comment-keyword
@@ -0,0 +1,14 @@
+      module a
+
+      contains
+
+      subroutine RIGHT (funcA, funcB)
+
+      real funcA  ! grid function a
+      real funcB  ! grid function b
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/t/t4018/fortran-comment-legacy b/t/t4018/fortran-comment-legacy
new file mode 100644
index 0000000000..53cd062c1e
--- /dev/null
+++ b/t/t4018/fortran-comment-legacy
@@ -0,0 +1,13 @@
+      module a
+
+      contains
+
+C subroutine wrong
+      subroutine RIGHT
+C subroutine wrong
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/t/t4018/fortran-comment-legacy-star b/t/t4018/fortran-comment-legacy-star
new file mode 100644
index 0000000000..2cbcdc3d8a
--- /dev/null
+++ b/t/t4018/fortran-comment-legacy-star
@@ -0,0 +1,13 @@
+      module a
+
+      contains
+
+* subroutine wrong
+      subroutine RIGHT
+* subroutine wrong
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/t/t4018/fortran-external-function b/t/t4018/fortran-external-function
new file mode 100644
index 0000000000..5a2d85d3aa
--- /dev/null
+++ b/t/t4018/fortran-external-function
@@ -0,0 +1,9 @@
+function RIGHT(a, b) result(c)
+
+integer, intent(in) :: ChangeMe
+integer, intent(in) :: b
+integer, intent(out) :: c
+
+c = a+b
+
+end function RIGHT
diff --git a/t/t4018/fortran-external-subroutine b/t/t4018/fortran-external-subroutine
new file mode 100644
index 0000000000..4ce85fea13
--- /dev/null
+++ b/t/t4018/fortran-external-subroutine
@@ -0,0 +1,5 @@
+subroutine RIGHT
+
+real ChangeMe
+
+end subroutine RIGHT
diff --git a/t/t4018/fortran-module b/t/t4018/fortran-module
new file mode 100644
index 0000000000..c4b737dac3
--- /dev/null
+++ b/t/t4018/fortran-module
@@ -0,0 +1,5 @@
+module RIGHT
+
+use ChangeMe
+
+end module RIGHT
diff --git a/t/t4018/fortran-module-procedure b/t/t4018/fortran-module-procedure
new file mode 100644
index 0000000000..1ce6d854c2
--- /dev/null
+++ b/t/t4018/fortran-module-procedure
@@ -0,0 +1,13 @@
+ module RIGHT
+
+   implicit none
+   private
+
+   interface letters  ! generic interface
+      module procedure aaaa, &
+                       bbbb, &
+                       ChangeMe, &
+                       dddd
+   end interface
+   
+end module RIGHT
diff --git a/t/t4018/fortran-program b/t/t4018/fortran-program
new file mode 100644
index 0000000000..4616895e4b
--- /dev/null
+++ b/t/t4018/fortran-program
@@ -0,0 +1,5 @@
+program RIGHT
+
+call ChangeMe
+
+end program RIGHT
diff --git a/t/t4018/markdown-heading-indented b/t/t4018/markdown-heading-indented
new file mode 100644
index 0000000000..1991c2bd45
--- /dev/null
+++ b/t/t4018/markdown-heading-indented
@@ -0,0 +1,6 @@
+Indented headings are allowed, as long as the indent is no more than 3 spaces.
+
+   ### RIGHT
+
+- something
+- ChangeMe
diff --git a/t/t4018/markdown-heading-non-headings b/t/t4018/markdown-heading-non-headings
new file mode 100644
index 0000000000..c479c1a3f1
--- /dev/null
+++ b/t/t4018/markdown-heading-non-headings
@@ -0,0 +1,17 @@
+Headings can be right next to other lines of the file:
+# RIGHT
+Indents of four or more spaces make a code block:
+
+    # code comment, not heading
+
+If there's no space after the final hash, it's not a heading:
+
+#hashtag
+
+Sequences of more than 6 hashes don't make a heading:
+
+####### over-enthusiastic heading
+
+So the detected heading should be right up at the start of this file.
+
+ChangeMe