test: add tests for the version command (#15)

Author: ns-vasilev

pkg/cmd/version/version_test.go

@@ -0,0 +1,47 @@
+package version
+
+import "testing"
+
+func TestFormat(t *testing.T) {
+	expects := "linkctl version 1.4.0\nhttps://github.com/space-code/linkctl/releases/tag/v1.4.0\n"
+	if got := Format("1.4.0"); got != expects {
+		t.Errorf("Format() = %q, wants %q", got, expects)
+	}
+}
+
+func TestChangelogURL(t *testing.T) {
+	tag := "0.3.2"
+	url := "https://github.com/space-code/linkctl/releases/tag/v0.3.2"
+	result := changelogURL(tag)
+	if result != url {
+		t.Errorf("expected %s to create url %s but got %s", tag, url, result)
+	}
+
+	tag = "v0.3.2"
+	url = "https://github.com/space-code/linkctl/releases/tag/v0.3.2"
+	result = changelogURL(tag)
+	if result != url {
+		t.Errorf("expected %s to create url %s but got %s", tag, url, result)
+	}
+
+	tag = "0.3.2-pre.1"
+	url = "https://github.com/space-code/linkctl/releases/tag/v0.3.2-pre.1"
+	result = changelogURL(tag)
+	if result != url {
+		t.Errorf("expected %s to create url %s but got %s", tag, url, result)
+	}
+
+	tag = "0.3.5-90-gdd3f0e0"
+	url = "https://github.com/space-code/linkctl/releases/latest"
+	result = changelogURL(tag)
+	if result != url {
+		t.Errorf("expected %s to create url %s but got %s", tag, url, result)
+	}
+
+	tag = "deadbeef"
+	url = "https://github.com/space-code/linkctl/releases/latest"
+	result = changelogURL(tag)
+	if result != url {
+		t.Errorf("expected %s to create url %s but got %s", tag, url, result)
+	}
+}