Add missing test files

cmd/show_test.go

@@ -0,0 +1,56 @@
+package cmd
+
+import (
+	"bytes"
+	"io/ioutil"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestShowCmd(t *testing.T) {
+	changelog, err := ioutil.ReadFile("testdata/show-changelog.md")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := `### Added
+- Item 1
+- Item 2
+
+### Changed
+- Item 3
+`
+
+	out := new(bytes.Buffer)
+	iostreams := &IOStreams{
+		In:  bytes.NewBuffer(changelog),
+		Out: out,
+	}
+
+	cmd := newShowCmd(iostreams)
+	cmd.SetArgs([]string{"1.0.0"})
+	_, err = cmd.ExecuteC()
+
+	assert.Nil(t, err)
+	assert.Equal(t, expected, string(out.Bytes()))
+}
+
+func TestShowCmdUnknownVersion(t *testing.T) {
+	changelog, err := ioutil.ReadFile("testdata/show-changelog.md")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	out := new(bytes.Buffer)
+	iostreams := &IOStreams{
+		In:  bytes.NewBuffer(changelog),
+		Out: out,
+	}
+
+	cmd := newShowCmd(iostreams)
+	cmd.SetArgs([]string{"9.9.9"})
+	_, err = cmd.ExecuteC()
+
+	assert.NotNil(t, err)
+}

cmd/testdata/show-changelog.md

@@ -0,0 +1,21 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+### Removed
+- Item 4
+
+## [1.0.0] - 2020-01-08
+### Added
+- Item 1
+- Item 2
+
+### Changed
+- Item 3
+
+[Unreleased]: https://github.com/rcmachado/changelog/compare/1.0.0...HEAD
+[1.0.0]: https://github.com/rcmachado/changelog/compare/ae761ff...1.0.0