diff --git a/src/configurations/__snapshots__/environments.test.ts.snap b/src/configurations/__snapshots__/environments.test.ts.snap
new file mode 100644
index 0000000..a23bdca
--- /dev/null
+++ b/src/configurations/__snapshots__/environments.test.ts.snap
@@ -0,0 +1,37 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`EnvironmentCategory 1`] = `
+Object {
+  "DEVELOPMENT": "development",
+  "FEATURE": "feature",
+  "MOCK": "mock",
+  "STABLE": "stable",
+  "VERIFICATION": "verification",
+}
+`;
+
+exports[`EnvironmentLabel 1`] = `
+Object {
+  "DEVELOPMENT": "development",
+  "FEATURE": "feature/[/a-zA-z0-9-]+",
+  "MOCK": "mock[0-9]",
+  "PREPRODUCTION": "preproduction",
+  "PRODUCTION": "production",
+  "QA": "qa[0-9]",
+  "STAGING": "staging",
+  "TEST": "test",
+}
+`;
+
+exports[`labelToCategory 1`] = `
+Object {
+  "development": "development",
+  "feature/[/a-zA-z0-9-]+": "feature",
+  "mock[0-9]": "mock",
+  "preproduction": "verification",
+  "production": "stable",
+  "qa[0-9]": "verification",
+  "staging": "stable",
+  "test": "verification",
+}
+`;
diff --git a/src/configurations/environments.test.ts b/src/configurations/environments.test.ts
new file mode 100644
index 0000000..5cf95d2
--- /dev/null
+++ b/src/configurations/environments.test.ts
@@ -0,0 +1,87 @@
+import {
+  EnvironmentCategory,
+  EnvironmentLabel,
+  labelToCategory,
+  ENV_REGEXP_MOCK,
+  ENV_REGEXP_FEATURE,
+  ENV_REGEXP_QA,
+  getLabelByName,
+  getCategoryByLabel,
+} from "./environments";
+
+test("EnvironmentCategory", () => {
+  expect(EnvironmentCategory).toMatchSnapshot();
+});
+
+test("EnvironmentLabel", () => {
+  expect(EnvironmentLabel).toMatchSnapshot();
+});
+
+test("labelToCategory", () => {
+  expect(labelToCategory).toMatchSnapshot();
+});
+
+describe("ENV_REGEXP_*", () => {
+  test("ENV_REGEXP_MOCK", () => {
+    expect(ENV_REGEXP_MOCK.test("mock1")).toBe(true);
+    expect(ENV_REGEXP_MOCK.test("mock2")).toBe(true);
+    expect(ENV_REGEXP_MOCK.test("mock3")).toBe(true);
+    expect(ENV_REGEXP_MOCK.test("mock4")).toBe(true);
+    expect(ENV_REGEXP_MOCK.test("mock5")).toBe(true);
+  });
+
+  test("ENV_REGEXP_FEATURE", () => {
+    expect(ENV_REGEXP_FEATURE.test("feature/foo")).toBe(true);
+    expect(ENV_REGEXP_FEATURE.test("feature/ticket-123/foobar")).toBe(true);
+  });
+
+  test("ENV_REGEXP_QA", () => {
+    expect(ENV_REGEXP_QA.test("qa1")).toBe(true);
+    expect(ENV_REGEXP_QA.test("qa2")).toBe(true);
+    expect(ENV_REGEXP_QA.test("qa3")).toBe(true);
+    expect(ENV_REGEXP_QA.test("qa4")).toBe(true);
+    expect(ENV_REGEXP_QA.test("qa5")).toBe(true);
+  });
+});
+
+describe("getLabelByName", () => {
+  test.each([
+    { name: "mock1", expected: EnvironmentLabel.MOCK },
+    { name: "feature/foo", expected: EnvironmentLabel.FEATURE },
+    { name: "qa1", expected: EnvironmentLabel.QA },
+    { name: "development", expected: EnvironmentLabel.DEVELOPMENT },
+    { name: "test", expected: EnvironmentLabel.TEST },
+    { name: "staging", expected: EnvironmentLabel.STAGING },
+    { name: "preproduction", expected: EnvironmentLabel.PREPRODUCTION },
+    { name: "production", expected: EnvironmentLabel.PRODUCTION },
+  ])("$name", ({ name, expected }) => {
+    expect(getLabelByName(name)).toBe(expected);
+  });
+});
+
+describe("getCategoryByLabel", () => {
+  test.each([
+    { label: EnvironmentLabel.MOCK, expected: EnvironmentCategory.MOCK },
+    {
+      label: EnvironmentLabel.DEVELOPMENT,
+      expected: EnvironmentCategory.DEVELOPMENT,
+    },
+    { label: EnvironmentLabel.FEATURE, expected: EnvironmentCategory.FEATURE },
+    {
+      label: EnvironmentLabel.TEST,
+      expected: EnvironmentCategory.VERIFICATION,
+    },
+    { label: EnvironmentLabel.STAGING, expected: EnvironmentCategory.STABLE },
+    { label: EnvironmentLabel.QA, expected: EnvironmentCategory.VERIFICATION },
+    {
+      label: EnvironmentLabel.PREPRODUCTION,
+      expected: EnvironmentCategory.VERIFICATION,
+    },
+    {
+      label: EnvironmentLabel.PRODUCTION,
+      expected: EnvironmentCategory.STABLE,
+    },
+  ])("$label", ({ label, expected }) => {
+    expect(getCategoryByLabel(label)).toBe(expected);
+  });
+});
diff --git a/src/configurations/environments.ts b/src/configurations/environments.ts
index 4e8cae5..002c611 100644
--- a/src/configurations/environments.ts
+++ b/src/configurations/environments.ts
@@ -59,9 +59,9 @@ export const labelToCategory: Record<EnvironmentLabel, EnvironmentCategory> = {
   [EnvironmentLabel.PRODUCTION]: EnvironmentCategory.STABLE,
 };
 
-const ENV_REGEXP_MOCK = new EnvRegExp(EnvironmentLabel.MOCK);
-const ENV_REGEXP_FEATURE = new EnvRegExp(EnvironmentLabel.FEATURE);
-const ENV_REGEXP_QA = new EnvRegExp(EnvironmentLabel.QA);
+export const ENV_REGEXP_MOCK = new EnvRegExp(EnvironmentLabel.MOCK);
+export const ENV_REGEXP_FEATURE = new EnvRegExp(EnvironmentLabel.FEATURE);
+export const ENV_REGEXP_QA = new EnvRegExp(EnvironmentLabel.QA);
 
 /**
  * TODO document