add tests

2 files changed, 40 insertions, 0 deletions

diff --git a/cmd/git-extract-issue/main_test.go b/cmd/git-extract-issue/main_test.go
new file mode 100644
index 0000000..dbf88c5
--- /dev/null
+++ b/cmd/git-extract-issue/main_test.go
@@ -0,0 +1,35 @@
+package main
+
+import "testing"
+
+func TestExtractIssueNumberFromBranchName(t *testing.T) {
+	tests := []struct {
+		name       string
+		branchName string
+		expected   string
+	}{
+		{"numeric only", "123", "#123"},
+		{"numeric with suffix", "123-suffix", "#123"},
+
+		{"feature prefix", "feature/123", "#123"},
+		{"feature prefix with suffix", "feature/123-suffix", "#123"},
+
+		{"project prefix", "feature/prefix-123", "prefix-123"},
+		{"project prefix with suffix", "feature/prefix-123-suffix", "prefix-123"},
+
+		{"bugfix prefix", "bugfix/123", "#123"},
+		{"hotfix prefix", "hotfix/456-fix", "#456"},
+
+		{"no number", "feature/no-number", ""},
+		{"empty string", "", ""},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			actual := extractIssueNumberFromBranchName(tt.branchName)
+			if actual != tt.expected {
+				t.Errorf("extractIssueNumberFromBranchName(%q) = %q, expected %q", tt.branchName, actual, tt.expected)
+			}
+		})
+	}
+}
diff --git a/justfile b/justfile
new file mode 100644
index 0000000..a14db65
--- /dev/null
+++ b/justfile
@@ -0,0 +1,5 @@
+build:
+    go build ./...
+
+test:
+    go test ./...