Add more tests to increase coverage.

.github/workflows/main.yml

@@ -3,7 +3,7 @@ on:
     tags:
     - v*
     branches:
-    - master
+    - main
   pull_request:
 name: Test and Lint
 jobs:
@@ -21,14 +21,14 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v2
     - name: Test
-      run: go test ./...
+      run: go test -v  -coverprofile=coverage.txt -covermode=atomic ./...
   lint:
     name: lint
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
     - name: golangci-lint
-      uses: golangci/golangci-lint-action@v1
+      uses: golangci/golangci-lint-action@v2
       with:
         # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-        version: v1.28
+        version: v1.28

README.md

@@ -1,4 +1,4 @@
-# go-patchutils [![GoDoc](https://godoc.org/github.com/google/go-patchutils?status.svg)](https://godoc.org/github.com/google/go-patchutils) [![Go Report Card](https://goreportcard.com/badge/github.com/google/go-patchutils)](https://goreportcard.com/report/github.com/google/go-patchutils)
+# go-patchutils [![GoDoc](https://godoc.org/github.com/google/go-patchutils?status.svg)](https://godoc.org/github.com/google/go-patchutils) [![Go Report Card](https://goreportcard.com/badge/github.com/google/go-patchutils)](https://goreportcard.com/report/github.com/google/go-patchutils) [![Coverage](https://gocover.io/_badge/github.com/google/go-patchutils)](https://gocover.io/github.com/google/go-patchutils)
 Package patchutils provides tools to compute the diff between source and diff files.
 
 Works with diff files in [unified format](http://gnu.org/software/diffutils/manual/html_node/Unified-Format.html).
@@ -282,12 +282,12 @@ go build
 
 **Interdiff mode**
 ```shell
-./cli interdiff -olddiff=<path_to_old_diff> -newdiff=<path_to_new_diff>
+./cli interdiff -olddiff=<FILENAME> -newdiff=<FILENAME>
 ```
 
 **Mixed mode**
 ```shell
-./cli mixed -oldsource=<path_to_old_source> -olddiff=<path_to_old_diff> 
--newsource=<path_to_new_source> -newdiff=<path_to_new_diff>
+./cli mixed -oldsource=<PATHNAME> -olddiff=<FILENAME> 
+-newsource=<PATHNAME> -newdiff=<FILENAME>
 ```
 

go.mod

@@ -4,6 +4,7 @@ go 1.14
 
 require (
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+	github.com/google/go-cmp v0.5.2
 	github.com/google/subcommands v1.2.0
 	github.com/kylelemons/godebug v1.1.0
 	github.com/sourcegraph/go-diff v0.6.0