Backfill test cases depending on current file

Add some missing test cases and remove some superfluous ones:

  1. Remove references to last_spec_line
  2. Add a Spec for RunCurrentSpecFile when in a spec file
  3. Spec for RunNearestSpec when in a spec file
  4. Test that RunAllSpecs runs all specs

Detail:

1. Remove references to last_spec_line

The test for RunCurrentSpecFile included references to a variable
'last_spec_line', and two contexts to handle the case where it is set or
not set.

This variable seems to have never been referenced in the code. It looks
like it was introduced in 6a39ba7, but only in the specs. My guess is
that this was used in a previous attempted implementation of that PR
(thoughtbot#79) and committed by
mistake.

2. Add a Spec for RunCurrentSpecFile when in a spec file

Approach: Create a new buffer and name it differently to the last_spec_file

:bdelete! is used in the after block (as opposed to e.g. :close!) so
that the buffer is actually deleted and new buffers can be created with
the same name in other tests.

Note: previously only the fallback case (calling RunCurrentSpecFile when
not currently in a spec file) was covered by specs.

3. Spec for RunNearestSpec when in a spec file

Approach:
- Set up a spec buffer with a different file name to last_spec_file and
  last_spec_file_with_line
- Write some lines into that buffer
- Jump to some point in the middle of that file

4. Test that RunAllSpecs runs all specs

Previously there was no test case for this.

Approach: regardless of anything else which might be set (e.g.
last_spec) this always runs 'spec'

NOTE: we need to explicitly set g:rspec_command when asserting the
resulting command, because by default the command differs depending on
environment - e.g. the default terminal command first calls 'clear' in
the terminal.

t/rspec_test.vim

@@ -94,48 +94,100 @@ describe "RunSpecs"
 end
 
 describe "RunCurrentSpecFile"
-  context "when not in a spec file"
+  before
+    let g:rspec_command = "!rspec {spec}"
+  end
+
+  after
+    unlet g:rspec_command
+  end
+
+  context "when in a spec file"
     before
-      let g:rspec_command = "!rspec {spec}"
+      new
+      file controller_spec.rb
     end
 
     after
-      unlet g:rspec_command
+      bdelete!
     end
 
-    context "when line number is not set"
-      it "runs the last spec file"
-        call Set("s:last_spec_file", "model_spec.rb")
+    it "runs the current spec file"
+      call Set("s:last_spec_file", "model_spec.rb")
 
-        call Call("RunCurrentSpecFile")
+      call Call("RunCurrentSpecFile")
 
-        Expect Ref("s:rspec_command") == "!rspec model_spec.rb"
-      end
+      Expect Ref("s:rspec_command") == "!rspec controller_spec.rb"
     end
 
-    context "when line number is set"
-      it "runs the last spec file"
-        call Set("s:last_spec_file", "model_spec.rb")
-        call Set("s:last_spec_line", 42)
+    it "sets last_spec_file to the current file"
+      call Set("s:last_spec_file", "model_spec.rb")
 
-        call Call("RunCurrentSpecFile")
+      call Call("RunCurrentSpecFile")
 
-        Expect Ref("s:rspec_command") == "!rspec model_spec.rb"
-      end
+      Expect Ref("s:last_spec_file") ==  "controller_spec.rb"
+    end
+  end
+
+  context "when not in a spec file"
+    it "runs the last spec file"
+      call Set("s:last_spec_file", "model_spec.rb")
+
+      call Call("RunCurrentSpecFile")
+
+      Expect Ref("s:rspec_command") == "!rspec model_spec.rb"
     end
   end
 end
 
 describe "RunNearestSpec"
-  context "not in a spec file"
+  before
+    let g:rspec_command = "!rspec {spec}"
+  end
+
+  after
+    unlet g:rspec_command
+  end
+
+  context "when in a spec file"
     before
-      let g:rspec_command = "!rspec {spec}"
+      new
+      file controller_spec.rb
+      put =[
+          \   'it \"is tautological\" do',
+          \   '  expect(true).to eq',
+          \   'end',
+          \   '',
+          \   'it \"is optimistic\" do',
+          \   '  expect(1 + 1).to eq 3',
+          \   'end',
+          \ ]
+      5 " jump to the start of the second spec
     end
 
     after
-      unlet g:rspec_command
+      bdelete!
+    end
+
+    it "runs the current spec file at the current line"
+      call Set("s:last_spec_file_with_line", "model_spec.rb:42")
+      call Set("s:last_spec_file", "model_spec.rb")
+
+      call Call("RunNearestSpec")
+
+      Expect Ref("s:rspec_command") == "!rspec controller_spec.rb:5"
     end
 
+    it "sets last_spec_file to the current file"
+      call Set("s:last_spec_file", "model_spec.rb")
+
+      call Call("RunNearestSpec")
+
+      Expect Ref("s:last_spec_file") ==  "controller_spec.rb"
+    end
+  end
+
+  context "not in a spec file"
     it "runs the last spec file with line"
       call Set("s:last_spec_file_with_line", "model_spec.rb:42")
 
@@ -167,6 +219,24 @@ describe "RunLastSpec"
 end
 
 describe "RunAllSpecs"
+  before
+    let g:rspec_command = "!rspec {spec}"
+  end
+
+  after
+    unlet g:rspec_command
+  end
+
+  it "runs all specs"
+    call Set("s:last_spec", "model_spec.rb:42")
+    call Set("s:last_spec_file", "model_spec.rb")
+    call Set("s:last_spec_file_with_line", "model_spec.rb:42")
+
+    call Call("RunAllSpecs")
+
+    Expect Ref("s:rspec_command") == "!rspec spec"
+  end
+
   it "sets s:last_spec to 'spec'"
     call Call("RunAllSpecs")