chore: add integration tests

Signed-off-by: Todd Baert <toddbaert@gmail.com>

.github/workflows/pr-checks.yaml

@@ -13,18 +13,27 @@ jobs:
   build-test-lint:
     runs-on: ubuntu-latest
 
+    services:
+      flagd:
+        image: ghcr.io/open-feature/flagd-testbed:latest
+        ports:
+          - 8013:8013
+
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
 
       - name: Install
         run: npm ci
 
+      - name: Build
+        run: npm run build
+
       - name: Lint
         run: npm run lint
 
-      - name: Build
-        run: npm run build
+      - name: Integration
+        run: npm run integration
 
       - name: Test
         run: npm run test

.gitignore

@@ -102,3 +102,7 @@ dist
 
 # TernJS port file
 .tern-port
+
+# yalc stuff
+yalc.lock
+.yalc/

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "test-harness"]
+	path = test-harness
+	url = https://github.com/open-feature/test-harness.git

README.md

@@ -48,6 +48,10 @@ We value having as few runtime dependencies as possible. The addition of any dep
 
 Run tests with `npm test`.
 
+### Integration tests
+
+The continuous integration runs a set of [gherkin integration tests](https://github.com/open-feature/test-harness/blob/main/features/evaluation.feature) using [`flagd`](https://github.com/open-feature/flagd). These tests run with the "integration" npm script. If you'd like to run them locally, you can start the flagd testbed with `docker run -p 8013:8013 ghcr.io/open-feature/flagd-testbed:latest` and then run `npm run integration`.
+
 ### Packaging
 
 Both ES modules and CommonJS modules are supported, so consumers can use both `require` and `import` functions to utilize this module. This is accomplished by building 2 variations of the output, under `dist/esm` and `dist/cjs`, respectively. To force resolution of the `dist/esm/**.js*` files as modules, a package json with only the context `{"type": "module"}` is included at a in a `postbuild` step. Type declarations are included at `/dist/types/`

integration/features/.gitignore

@@ -0,0 +1 @@
+evaluation.feature

integration/step-definitions/evaluation.spec.ts

@@ -0,0 +1,320 @@
+import { defineFeature, loadFeature } from 'jest-cucumber';
+import { OpenFeature } from '../../src/open-feature';
+import {
+  EvaluationContext,
+  EvaluationDetails,
+  JsonObject,
+  JsonValue,
+  ResolutionDetails,
+  ResolutionReason,
+  StandardResolutionReasons
+} from '../../src/types';
+
+// load the feature file.
+const feature = loadFeature('integration/features/evaluation.feature');
+
+// get a client (flagd provider registered in setup)
+const client = OpenFeature.getClient();
+
+defineFeature(feature, (test) => {
+  test('Resolves boolean value', ({ when, then }) => {
+    let value: boolean;
+    let flagKey: string;
+
+    when(
+      /^a boolean flag with key '(.*)' is evaluated with default value '(.*)'$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        value = await client.getBooleanValue(flagKey, defaultValue === 'true');
+      }
+    );
+
+    then(/^the resolved boolean value should be '(.*)'$/, (expectedValue: string) => {
+      expect(value).toEqual(expectedValue === 'true');
+    });
+  });
+
+  test('Resolves string value', ({ when, then }) => {
+    let value: string;
+    let flagKey: string;
+
+    when(
+      /^a string flag with key '(.*)' is evaluated with default value '(.*)'$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        value = await client.getStringValue(flagKey, defaultValue);
+      }
+    );
+
+    then(/^the resolved string value should be '(.*)'$/, (expectedValue: string) => {
+      expect(value).toEqual(expectedValue);
+    });
+  });
+
+  test('Resolves integer value', ({ when, then }) => {
+    let value: number;
+    let flagKey: string;
+
+    when(
+      /^an integer flag with key '(.*)' is evaluated with default value (\d+)$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        value = await client.getNumberValue(flagKey, Number.parseInt(defaultValue));
+      }
+    );
+
+    then(/^the resolved integer value should be (\d+)$/, (expectedValue: string) => {
+      expect(value).toEqual(Number.parseInt(expectedValue));
+    });
+  });
+
+  test('Resolves float value', ({ when, then }) => {
+    let value: number;
+    let flagKey: string;
+
+    when(
+      /^a float flag with key '(.*)' is evaluated with default value (\d+\.?\d*)$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        value = await client.getNumberValue(flagKey, Number.parseFloat(defaultValue));
+      }
+    );
+
+    then(/^the resolved float value should be (\d+\.?\d*)$/, (expectedValue: string) => {
+      expect(value).toEqual(Number.parseFloat(expectedValue));
+    });
+  });
+
+  test('Resolves object value', ({ when, then }) => {
+    let value: JsonValue;
+    let flagKey: string;
+
+    when(/^an object flag with key '(.*)' is evaluated with a null default value$/, async (key: string) => {
+      flagKey = key;
+      value = await client.getObjectValue(flagKey, {});
+    });
+
+    then(
+      /^the resolved object value should be contain fields '(.*)', '(.*)', and '(.*)', with values '(.*)', '(.*)' and (\d+), respectively$/,
+      (field1: string, field2: string, field3: string, boolValue: string, stringValue: string, intValue: string) => {
+        const jsonObject = value as JsonObject;
+        expect(jsonObject[field1]).toEqual(boolValue === 'true');
+        expect(jsonObject[field2]).toEqual(stringValue);
+        expect(jsonObject[field3]).toEqual(Number.parseInt(intValue));
+      }
+    );
+  });
+
+  test('Resolves boolean details', ({ when, then }) => {
+    let details: EvaluationDetails<boolean>;
+    let flagKey: string;
+
+    when(
+      /^a boolean flag with key '(.*)' is evaluated with details and default value '(.*)'$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        details = await client.getBooleanDetails(flagKey, defaultValue === 'true');
+      }
+    );
+
+    then(
+      /^the resolved boolean details value should be '(.*)', the variant should be '(.*)', and the reason should be '(.*)'$/,
+      (expectedValue: string, expectedVariant: string, expectedReason: string) => {
+        expect(details.value).toEqual(expectedValue === 'true');
+        expect(details.variant).toEqual(expectedVariant);
+        expect(details.reason).toEqual(convertExpectationToStatic(expectedReason));
+      }
+    );
+  });
+
+  test('Resolves string details', ({ when, then }) => {
+    let details: EvaluationDetails<string>;
+    let flagKey: string;
+
+    when(
+      /^a string flag with key '(.*)' is evaluated with details and default value '(.*)'$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        details = await client.getStringDetails(flagKey, defaultValue);
+      }
+    );
+
+    then(
+      /^the resolved string details value should be '(.*)', the variant should be '(.*)', and the reason should be '(.*)'$/,
+      (expectedValue: string, expectedVariant: string, expectedReason: string) => {
+        expect(details.value).toEqual(expectedValue);
+        expect(details.variant).toEqual(expectedVariant);
+        expect(details.reason).toEqual(convertExpectationToStatic(expectedReason));
+      }
+    );
+  });
+
+  test('Resolves integer details', ({ when, then }) => {
+    let details: EvaluationDetails<number>;
+    let flagKey: string;
+
+    when(
+      /^an integer flag with key '(.*)' is evaluated with details and default value (\d+)$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        details = await client.getNumberDetails(flagKey, Number.parseInt(defaultValue));
+      }
+    );
+
+    then(
+      /^the resolved integer details value should be (\d+), the variant should be '(.*)', and the reason should be '(.*)'$/,
+      (expectedValue: string, expectedVariant: string, expectedReason: string) => {
+        expect(details.value).toEqual(Number.parseInt(expectedValue));
+        expect(details.variant).toEqual(expectedVariant);
+        expect(details.reason).toEqual(convertExpectationToStatic(expectedReason));
+      }
+    );
+  });
+
+  test('Resolves float details', ({ when, then }) => {
+    let details: EvaluationDetails<number>;
+    let flagKey: string;
+
+    when(
+      /^a float flag with key '(.*)' is evaluated with details and default value (\d+\.?\d*)$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        details = await client.getNumberDetails(flagKey, Number.parseFloat(defaultValue));
+      }
+    );
+
+    then(
+      /^the resolved float details value should be (\d+\.?\d*), the variant should be '(.*)', and the reason should be '(.*)'$/,
+      (expectedValue: string, expectedVariant: string, expectedReason: string) => {
+        expect(details.value).toEqual(Number.parseFloat(expectedValue));
+        expect(details.variant).toEqual(expectedVariant);
+        expect(details.reason).toEqual(convertExpectationToStatic(expectedReason));
+      }
+    );
+  });
+
+  test('Resolves object details', ({ when, then, and }) => {
+    let details: EvaluationDetails<JsonValue>; // update this after merge
+    let flagKey: string;
+
+    when(/^an object flag with key '(.*)' is evaluated with details and a null default value$/, async (key: string) => {
+      flagKey = key;
+      details = await client.getObjectDetails(flagKey, {}); // update this after merge
+    });
+
+    then(
+      /^the resolved object details value should be contain fields '(.*)', '(.*)', and '(.*)', with values '(.*)', '(.*)' and (\d+), respectively$/,
+      (field1: string, field2: string, field3: string, boolValue: string, stringValue: string, intValue: string) => {
+        const jsonObject = details.value as JsonObject;
+
+        expect(jsonObject[field1]).toEqual(boolValue === 'true');
+        expect(jsonObject[field2]).toEqual(stringValue);
+        expect(jsonObject[field3]).toEqual(Number.parseInt(intValue));
+      }
+    );
+
+    and(
+      /^the variant should be '(.*)', and the reason should be '(.*)'$/,
+      (expectedVariant: string, expectedReason: string) => {
+        expect(details.variant).toEqual(expectedVariant);
+        expect(details.reason).toEqual(convertExpectationToStatic(expectedReason));
+      }
+    );
+  });
+
+  test('Resolves based on context', ({ when, and, then }) => {
+    const context: EvaluationContext = {};
+    let value: string;
+    let flagKey: string;
+
+    when(
+      /^context contains keys '(.*)', '(.*)', '(.*)', '(.*)' with values '(.*)', '(.*)', (\d+), '(.*)'$/,
+      (
+        stringField1: string,
+        stringField2: string,
+        intField: string,
+        boolField: string,
+        stringValue1: string,
+        stringValue2: string,
+        intValue: string,
+        boolValue: string
+      ) => {
+        context[stringField1] = stringValue1;
+        context[stringField2] = stringValue2;
+        context[intField] = Number.parseInt(intValue);
+        context[boolField] = boolValue === 'true';
+      }
+    );
+
+    and(/^a flag with key '(.*)' is evaluated with default value '(.*)'$/, async (key: string, defaultValue: string) => {
+      flagKey = key;
+      value = await client.getStringValue(flagKey, defaultValue, context);
+    });
+
+    then(/^the resolved string response should be '(.*)'$/, (expectedValue: string) => {
+      expect(value).toEqual(expectedValue);
+    });
+
+    and(/^the resolved flag value is '(.*)' when the context is empty$/, async (expectedValue) => {
+      const emptyContextValue = await client.getStringValue(flagKey, 'nope', {});
+      expect(emptyContextValue).toEqual(expectedValue);
+    });
+  });
+
+  test('Flag not found', ({ when, then, and }) => {
+    let flagKey: string;
+    let fallbackValue: string;
+    let details: ResolutionDetails<string>;
+
+    when(
+      /^a non-existent string flag with key '(.*)' is evaluated with details and a default value '(.*)'$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        fallbackValue = defaultValue;
+        details = await client.getStringDetails(flagKey, defaultValue);
+      }
+    );
+
+    then(/^then the default string value should be returned$/, () => {
+      expect(details.value).toEqual(fallbackValue);
+    });
+
+    and(
+      /^the reason should indicate an error and the error code should indicate a missing flag with '(.*)'$/,
+      (errorCode: string) => {
+        expect(details.reason).toEqual(StandardResolutionReasons.ERROR);
+        expect(details.errorCode).toEqual(errorCode);
+      }
+    );
+  });
+
+  test('Type error', ({ when, then, and }) => {
+    let flagKey: string;
+    let fallbackValue: number;
+    let details: ResolutionDetails<number>;
+
+    when(
+      /^a string flag with key '(.*)' is evaluated as an integer, with details and a default value (\d+)$/,
+      async (key: string, defaultValue: string) => {
+        flagKey = key;
+        fallbackValue = Number.parseInt(defaultValue);
+        details = await client.getNumberDetails(flagKey, Number.parseInt(defaultValue));
+      }
+    );
+
+    then(/^then the default integer value should be returned$/, () => {
+      expect(details.value).toEqual(fallbackValue);
+    });
+
+    and(
+      /^the reason should indicate an error and the error code should indicate a type mismatch with '(.*)'$/,
+      (errorCode: string) => {
+        expect(details.reason).toEqual(StandardResolutionReasons.ERROR);
+        expect(details.errorCode).toEqual(errorCode);
+      }
+    );
+  });
+});
+
+const convertExpectationToStatic = (reason: ResolutionReason) =>
+  reason === StandardResolutionReasons.DEFAULT ? StandardResolutionReasons.STATIC : undefined;

integration/step-definitions/jest.config.ts

@@ -0,0 +1,16 @@
+export default {
+  clearMocks: true,
+  collectCoverage: true,
+  coverageDirectory: 'coverage',
+  coverageProvider: 'v8',
+  globals: {
+    'ts-jest': {
+      tsConfig: 'integration/step-definitions/tsconfig.json',
+    },
+  },
+  moduleNameMapper: {
+    '^(.*)\\.js$': ['$1', '$1.js'],
+  },
+  setupFiles: ['./setup.ts'],
+  preset: 'ts-jest',
+};