feat: Adds 'Custom' sort_type to CommitGroup (#69)

Closes #60

commit_extractor_test.go

@@ -135,3 +135,134 @@ func TestCommitExtractor(t *testing.T) {
 		},
 	}, noteGroups)
 }
+
+func TestCommitOrderExtractor(t *testing.T) {
+	assert := assert.New(t)
+
+	extractor := newCommitExtractor(&Options{
+		CommitSortBy:          "Scope",
+		CommitGroupBy:         "Type",
+		CommitGroupSortBy:     "Custom",
+		CommitGroupTitleOrder: []string{"foo", "bar"},
+		CommitGroupTitleMaps: map[string]string{
+			"bar": "BAR",
+		},
+	})
+
+	fixtures := []*Commit{
+		// [0]
+		{
+			Type:   "foo",
+			Scope:  "c",
+			Header: "1",
+			Notes:  []*Note{},
+		},
+		// [1]
+		{
+			Type:   "foo",
+			Scope:  "b",
+			Header: "2",
+			Notes: []*Note{
+				{"note1-title", "note1-body"},
+				{"note2-title", "note2-body"},
+			},
+		},
+		// [2]
+		{
+			Type:   "bar",
+			Scope:  "d",
+			Header: "3",
+			Notes: []*Note{
+				{"note1-title", "note1-body"},
+				{"note3-title", "note3-body"},
+			},
+		},
+		// [3]
+		{
+			Type:   "foo",
+			Scope:  "a",
+			Header: "4",
+			Notes: []*Note{
+				{"note4-title", "note4-body"},
+			},
+		},
+		// [4]
+		{
+			Type:   "",
+			Scope:  "",
+			Header: "Merge1",
+			Notes:  []*Note{},
+			Merge: &Merge{
+				Ref:    "123",
+				Source: "merges/merge1",
+			},
+		},
+		// [5]
+		{
+			Type:   "",
+			Scope:  "",
+			Header: "Revert1",
+			Notes:  []*Note{},
+			Revert: &Revert{
+				Header: "REVERT1",
+			},
+		},
+	}
+
+	commitGroups, mergeCommits, revertCommits, noteGroups := extractor.Extract(fixtures)
+
+	assert.Equal([]*CommitGroup{
+		{
+			RawTitle: "foo",
+			Title:    "Foo",
+			Commits: []*Commit{
+				fixtures[3],
+				fixtures[1],
+				fixtures[0],
+			},
+		},
+		{
+			RawTitle: "bar",
+			Title:    "BAR",
+			Commits: []*Commit{
+				fixtures[2],
+			},
+		},
+	}, commitGroups)
+
+	assert.Equal([]*Commit{
+		fixtures[4],
+	}, mergeCommits)
+
+	assert.Equal([]*Commit{
+		fixtures[5],
+	}, revertCommits)
+
+	assert.Equal([]*NoteGroup{
+		{
+			Title: "note1-title",
+			Notes: []*Note{
+				fixtures[1].Notes[0],
+				fixtures[2].Notes[0],
+			},
+		},
+		{
+			Title: "note2-title",
+			Notes: []*Note{
+				fixtures[1].Notes[1],
+			},
+		},
+		{
+			Title: "note3-title",
+			Notes: []*Note{
+				fixtures[2].Notes[1],
+			},
+		},
+		{
+			Title: "note4-title",
+			Notes: []*Note{
+				fixtures[3].Notes[0],
+			},
+		},
+	}, noteGroups)
+}