diff --git a/awx/ui_next/src/api/models/CredentialTypes.js b/awx/ui_next/src/api/models/CredentialTypes.js
index dab1676231..39247b5ebc 100644
--- a/awx/ui_next/src/api/models/CredentialTypes.js
+++ b/awx/ui_next/src/api/models/CredentialTypes.js
@@ -27,6 +27,10 @@ class CredentialTypes extends Base {
       .concat(nextResults)
       .filter(type => acceptableKinds.includes(type.kind));
   }
+
+  test(id, data) {
+    return this.http.post(`${this.baseUrl}${id}/test/`, data);
+  }
 }
 
 export default CredentialTypes;
diff --git a/awx/ui_next/src/api/models/Credentials.js b/awx/ui_next/src/api/models/Credentials.js
index 95e954fc0c..13ee1f8a9c 100644
--- a/awx/ui_next/src/api/models/Credentials.js
+++ b/awx/ui_next/src/api/models/Credentials.js
@@ -25,6 +25,10 @@ class Credentials extends Base {
       params,
     });
   }
+
+  test(id, data) {
+    return this.http.post(`${this.baseUrl}${id}/test/`, data);
+  }
 }
 
 export default Credentials;
diff --git a/awx/ui_next/src/screens/Credential/shared/CredentialForm.jsx b/awx/ui_next/src/screens/Credential/shared/CredentialForm.jsx
index bc486bb8b1..5a76a76271 100644
--- a/awx/ui_next/src/screens/Credential/shared/CredentialForm.jsx
+++ b/awx/ui_next/src/screens/Credential/shared/CredentialForm.jsx
@@ -1,16 +1,19 @@
-import React from 'react';
+import React, { useState } from 'react';
 import { Formik, useField } from 'formik';
 import { withI18n } from '@lingui/react';
 import { t } from '@lingui/macro';
 import { arrayOf, func, object, shape } from 'prop-types';
-import { Form, FormGroup } from '@patternfly/react-core';
+import { ActionGroup, Button, Form, FormGroup } from '@patternfly/react-core';
 import FormField, { FormSubmitError } from '../../../components/FormField';
-import FormActionGroup from '../../../components/FormActionGroup/FormActionGroup';
+import {
+  FormColumnLayout,
+  FormFullWidthLayout,
+} from '../../../components/FormLayout';
 import AnsibleSelect from '../../../components/AnsibleSelect';
 import { required } from '../../../util/validators';
 import OrganizationLookup from '../../../components/Lookup/OrganizationLookup';
-import { FormColumnLayout } from '../../../components/FormLayout';
 import TypeInputsSubForm from './TypeInputsSubForm';
+import ExternalTestModal from './ExternalTestModal';
 
 function CredentialFormFields({
   i18n,
@@ -139,6 +142,7 @@ function CredentialFormFields({
 }
 
 function CredentialForm({
+  i18n,
   credential = {},
   credentialTypes,
   inputSources,
@@ -147,6 +151,7 @@ function CredentialForm({
   submitError,
   ...rest
 }) {
+  const [showExternalTestModal, setShowExternalTestModal] = useState(false);
   const initialValues = {
     name: credential.name || '',
     description: credential.description || '',
@@ -205,21 +210,61 @@ function CredentialForm({
       }}
     >
       {formik => (
-        <Form autoComplete="off" onSubmit={formik.handleSubmit}>
-          <FormColumnLayout>
-            <CredentialFormFields
-              formik={formik}
-              initialValues={initialValues}
-              credentialTypes={credentialTypes}
-              {...rest}
+        <>
+          <Form autoComplete="off" onSubmit={formik.handleSubmit}>
+            <FormColumnLayout>
+              <CredentialFormFields
+                formik={formik}
+                initialValues={initialValues}
+                credentialTypes={credentialTypes}
+                i18n={i18n}
+                {...rest}
+              />
+              <FormSubmitError error={submitError} />
+              <FormFullWidthLayout>
+                <ActionGroup>
+                  <Button
+                    aria-label={i18n._(t`Save`)}
+                    variant="primary"
+                    type="button"
+                    onClick={formik.handleSubmit}
+                  >
+                    {i18n._(t`Save`)}
+                  </Button>
+                  {formik?.values?.credential_type &&
+                    credentialTypes[formik.values.credential_type]?.kind ===
+                      'external' && (
+                      <Button
+                        aria-label={i18n._(t`Test`)}
+                        variant="secondary"
+                        type="button"
+                        onClick={() => setShowExternalTestModal(true)}
+                        isDisabled={!formik.isValid}
+                      >
+                        {i18n._(t`Test`)}
+                      </Button>
+                    )}
+                  <Button
+                    aria-label={i18n._(t`Cancel`)}
+                    variant="secondary"
+                    type="button"
+                    onClick={onCancel}
+                  >
+                    {i18n._(t`Cancel`)}
+                  </Button>
+                </ActionGroup>
+              </FormFullWidthLayout>
+            </FormColumnLayout>
+          </Form>
+          {showExternalTestModal && (
+            <ExternalTestModal
+              credential={credential}
+              credentialType={credentialTypes[formik.values.credential_type]}
+              credentialFormValues={formik.values}
+              onClose={() => setShowExternalTestModal(false)}
             />
-            <FormSubmitError error={submitError} />
-            <FormActionGroup
-              onCancel={onCancel}
-              onSubmit={formik.handleSubmit}
-            />
-          </FormColumnLayout>
-        </Form>
+          )}
+        </>
       )}
     </Formik>
   );
diff --git a/awx/ui_next/src/screens/Credential/shared/CredentialForm.test.jsx b/awx/ui_next/src/screens/Credential/shared/CredentialForm.test.jsx
index d23e5347ee..f4360e75ba 100644
--- a/awx/ui_next/src/screens/Credential/shared/CredentialForm.test.jsx
+++ b/awx/ui_next/src/screens/Credential/shared/CredentialForm.test.jsx
@@ -99,6 +99,9 @@ describe('<CredentialForm />', () => {
     test('should display form fields on add properly', async () => {
       addFieldExpects();
     });
+    test('should hide Test button initially', () => {
+      expect(wrapper.find('Button[children="Test"]').length).toBe(0);
+    });
     test('should update form values', async () => {
       // name and description change
       await act(async () => {
@@ -221,6 +224,18 @@ describe('<CredentialForm />', () => {
         'There was an error parsing the file. Please check the file formatting and try again.'
       );
     });
+    test('should show Test button when external credential type is selected', async () => {
+      await act(async () => {
+        await wrapper
+          .find('AnsibleSelect[id="credential_type"]')
+          .invoke('onChange')(null, 21);
+      });
+      wrapper.update();
+      expect(wrapper.find('Button[children="Test"]').length).toBe(1);
+      expect(wrapper.find('Button[children="Test"]').props().isDisabled).toBe(
+        true
+      );
+    });
     test('should call handleCancel when Cancel button is clicked', async () => {
       expect(onCancel).not.toHaveBeenCalled();
       wrapper.find('button[aria-label="Cancel"]').invoke('onClick')();
diff --git a/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialField.jsx b/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialField.jsx
index aafa1c74fe..51c9dfa02d 100644
--- a/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialField.jsx
+++ b/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialField.jsx
@@ -110,7 +110,7 @@ function CredentialField({ credentialType, fieldOptions, i18n }) {
       >
         <AnsibleSelect
           {...subFormField}
-          id="credential_type"
+          id={`credential-${fieldOptions.id}`}
           data={selectOptions}
           onChange={(event, value) => {
             helpers.setValue(value);
diff --git a/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialPlugins/CredentialPluginTestAlert.jsx b/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialPlugins/CredentialPluginTestAlert.jsx
new file mode 100644
index 0000000000..f1c4a4ae97
--- /dev/null
+++ b/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialPlugins/CredentialPluginTestAlert.jsx
@@ -0,0 +1,91 @@
+import React, { useEffect, useState } from 'react';
+import { withI18n } from '@lingui/react';
+import { t } from '@lingui/macro';
+import { string, shape } from 'prop-types';
+import {
+  Alert,
+  AlertActionCloseButton,
+  AlertGroup,
+} from '@patternfly/react-core';
+
+function CredentialPluginTestAlert({
+  i18n,
+  credentialName,
+  successResponse,
+  errorResponse,
+}) {
+  const [testMessage, setTestMessage] = useState('');
+  const [testVariant, setTestVariant] = useState(false);
+
+  useEffect(() => {
+    if (errorResponse) {
+      if (errorResponse?.response?.data?.inputs) {
+        if (errorResponse.response.data.inputs.startsWith('HTTP')) {
+          const [
+            errorCode,
+            errorStr,
+          ] = errorResponse.response.data.inputs.split('\n');
+          try {
+            const errorJSON = JSON.parse(errorStr);
+            setTestMessage(
+              `${errorCode}${
+                errorJSON?.errors[0] ? `: ${errorJSON.errors[0]}` : ''
+              }`
+            );
+          } catch {
+            setTestMessage(errorResponse.response.data.inputs);
+          }
+        } else {
+          setTestMessage(errorResponse.response.data.inputs);
+        }
+      } else {
+        setTestMessage(
+          i18n._(
+            t`Something went wrong with the request to test this credential and metadata.`
+          )
+        );
+      }
+      setTestVariant('danger');
+    } else if (successResponse) {
+      setTestMessage(i18n._(t`Test passed`));
+      setTestVariant('success');
+    }
+  }, [i18n, successResponse, errorResponse]);
+
+  return (
+    <AlertGroup isToast>
+      {testMessage && testVariant && (
+        <Alert
+          actionClose={
+            <AlertActionCloseButton
+              onClose={() => {
+                setTestMessage(null);
+                setTestVariant(null);
+              }}
+            />
+          }
+          title={
+            <>
+              <b id="credential-plugin-test-name">{credentialName}</b>
+              <p id="credential-plugin-test-message">{testMessage}</p>
+            </>
+          }
+          variant={testVariant}
+        />
+      )}
+    </AlertGroup>
+  );
+}
+
+CredentialPluginTestAlert.propTypes = {
+  credentialName: string.isRequired,
+  successResponse: shape({}),
+  errorResponse: shape({}),
+};
+
+CredentialPluginTestAlert.defaultProps = {
+  successResponse: null,
+  errorResponse: null,
+};
+
+export default withI18n()(CredentialPluginTestAlert);
diff --git a/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialPlugins/index.js b/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialPlugins/index.js
index 033586567f..3799206eb4 100644
--- a/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialPlugins/index.js
+++ b/awx/ui_next/src/screens/Credential/shared/CredentialFormFields/CredentialPlugins/index.js
@@ -1,2 +1,3 @@
 export { default as CredentialPluginSelected } from './CredentialPluginSelected';
 export { default as CredentialPluginField } from './CredentialPluginField';
+export { default as CredentialPluginTestAlert } from './CredentialPluginTestAlert';
diff --git a/awx/ui_next/src/screens/Credential/shared/ExternalTestModal.jsx b/awx/ui_next/src/screens/Credential/shared/ExternalTestModal.jsx
new file mode 100644
index 0000000000..fda8bc4492
--- /dev/null
+++ b/awx/ui_next/src/screens/Credential/shared/ExternalTestModal.jsx
@@ -0,0 +1,198 @@
+import React, { useCallback } from 'react';
+import { withI18n } from '@lingui/react';
+import { t } from '@lingui/macro';
+import styled from 'styled-components';
+import { func, shape } from 'prop-types';
+import { Formik } from 'formik';
+import {
+  Button,
+  Form,
+  FormGroup,
+  Modal,
+  Tooltip,
+} from '@patternfly/react-core';
+import { QuestionCircleIcon as PFQuestionCircleIcon } from '@patternfly/react-icons';
+import { CredentialsAPI, CredentialTypesAPI } from '../../../api';
+import AnsibleSelect from '../../../components/AnsibleSelect';
+import FormField from '../../../components/FormField';
+import { FormFullWidthLayout } from '../../../components/FormLayout';
+import { required } from '../../../util/validators';
+import useRequest from '../../../util/useRequest';
+import { CredentialPluginTestAlert } from './CredentialFormFields/CredentialPlugins';
+
+const QuestionCircleIcon = styled(PFQuestionCircleIcon)`
+  margin-left: 10px;
+`;
+
+function ExternalTestModal({
+  i18n,
+  credential,
+  credentialType,
+  credentialFormValues,
+  onClose,
+}) {
+  const {
+    result: testPluginSuccess,
+    error: testPluginError,
+    request: testPluginMetadata,
+  } = useRequest(
+    useCallback(
+      async values => {
+        const payload = {
+          inputs: credentialType.inputs.fields.reduce(
+            (filteredInputs, field) => {
+              filteredInputs[field.id] = credentialFormValues.inputs[field.id];
+              return filteredInputs;
+            },
+            {}
+          ),
+          metadata: values,
+        };
+
+        if (credential && credential.credential_type === credentialType.id) {
+          return CredentialsAPI.test(credential.id, payload);
+        }
+        return CredentialTypesAPI.test(credentialType.id, payload);
+      },
+      [
+        credential,
+        credentialType.id,
+        credentialType.inputs.fields,
+        credentialFormValues.inputs,
+      ]
+    ),
+    null
+  );
+
+  const handleTest = async values => {
+    await testPluginMetadata(values);
+  };
+
+  return (
+    <>
+      <Formik
+        initialValues={credentialType.inputs.metadata.reduce(
+          (initialValues, field) => {
+            if (field.type === 'string' && field.choices) {
+              initialValues[field.id] = field.default || field.choices[0];
+            } else {
+              initialValues[field.id] = '';
+            }
+            return initialValues;
+          },
+          {}
+        )}
+        onSubmit={values => handleTest(values)}
+      >
+        {({ handleSubmit, setFieldValue }) => (
+          <Modal
+            title={i18n._(t`Test External Credential`)}
+            isOpen
+            onClose={() => onClose()}
+            variant="small"
+            actions={[
+              <Button
+                id="run-external-credential-test"
+                key="confirm"
+                variant="primary"
+                onClick={() => handleSubmit()}
+              >
+                {i18n._(t`Run`)}
+              </Button>,
+              <Button
+                id="cancel-external-credential-test"
+                key="cancel"
+                variant="link"
+                onClick={() => onClose()}
+              >
+                {i18n._(t`Cancel`)}
+              </Button>,
+            ]}
+          >
+            <Form>
+              <FormFullWidthLayout>
+                {credentialType.inputs.metadata.map(field => {
+                  const isRequired = credentialType.inputs?.required.includes(
+                    field.id
+                  );
+                  if (field.type === 'string') {
+                    if (field.choices) {
+                      return (
+                        <FormGroup
+                          key={field.id}
+                          fieldId={`credential-${field.id}`}
+                          label={field.label}
+                          labelIcon={
+                            field.help_text && (
+                              <Tooltip
+                                content={field.help_text}
+                                position="right"
+                              >
+                                <QuestionCircleIcon />
+                              </Tooltip>
+                            )
+                          }
+                          isRequired={isRequired}
+                        >
+                          <AnsibleSelect
+                            name={field.id}
+                            value={field.default}
+                            id={`credential-${field.id}`}
+                            data={field.choices.map(choice => {
+                              return {
+                                value: choice,
+                                key: choice,
+                                label: choice,
+                              };
+                            })}
+                            onChange={(event, value) => {
+                              setFieldValue(field.id, value);
+                            }}
+                            validate={isRequired ? required(null, i18n) : null}
+                          />
+                        </FormGroup>
+                      );
+                    }
+
+                    return (
+                      <FormField
+                        key={field.id}
+                        id={`credential-${field.id}`}
+                        label={field.label}
+                        tooltip={field.help_text}
+                        name={field.id}
+                        type={field.multiline ? 'textarea' : 'text'}
+                        isRequired={isRequired}
+                        validate={isRequired ? required(null, i18n) : null}
+                      />
+                    );
+                  }
+
+                  return null;
+                })}
+              </FormFullWidthLayout>
+            </Form>
+          </Modal>
+        )}
+      </Formik>
+      <CredentialPluginTestAlert
+        credentialName={credentialFormValues.name}
+        successResponse={testPluginSuccess}
+        errorResponse={testPluginError}
+      />
+    </>
+  );
+}
+
+ExternalTestModal.proptype = {
+  credential: shape({}),
+  credentialType: shape({}).isRequired,
+  credentialFormValues: shape({}).isRequired,
+  onClose: func.isRequired,
+};
+
+ExternalTestModal.defaultProps = {
+  credential: null,
+};
+
+export default withI18n()(ExternalTestModal);
diff --git a/awx/ui_next/src/screens/Credential/shared/ExternalTestModal.test.jsx b/awx/ui_next/src/screens/Credential/shared/ExternalTestModal.test.jsx
new file mode 100644
index 0000000000..91677795aa
--- /dev/null
+++ b/awx/ui_next/src/screens/Credential/shared/ExternalTestModal.test.jsx
@@ -0,0 +1,180 @@
+import React from 'react';
+import { act } from 'react-dom/test-utils';
+import { mountWithContexts } from '../../../../testUtils/enzymeHelpers';
+import { CredentialsAPI, CredentialTypesAPI } from '../../../api';
+import ExternalTestModal from './ExternalTestModal';
+import credentialTypesArr from './data.credentialTypes.json';
+
+jest.mock('../../../api/models/Credentials');
+jest.mock('../../../api/models/CredentialTypes');
+
+const credentialType = credentialTypesArr.find(
+  credType => credType.namespace === 'hashivault_kv'
+);
+
+const credentialFormValues = {
+  name: 'Foobar',
+  credential_type: credentialType.id,
+  inputs: {
+    api_version: 'v2',
+    token: '$encrypted$',
+    url: 'http://hashivault:8200',
+  },
+};
+
+const credential = {
+  id: 1,
+  name: 'A credential',
+  credential_type: credentialType.id,
+};
+
+describe('<ExternalTestModal />', () => {
+  let wrapper;
+  afterEach(() => wrapper.unmount());
+  test('should display metadata fields correctly', async () => {
+    wrapper = mountWithContexts(
+      <ExternalTestModal
+        credentialType={credentialType}
+        credentialFormValues={credentialFormValues}
+        onClose={jest.fn()}
+      />
+    );
+    expect(wrapper.find('FormField').length).toBe(5);
+    expect(wrapper.find('input#credential-secret_backend').length).toBe(1);
+    expect(wrapper.find('input#credential-secret_path').length).toBe(1);
+    expect(wrapper.find('input#credential-auth_path').length).toBe(1);
+    expect(wrapper.find('input#credential-secret_key').length).toBe(1);
+    expect(wrapper.find('input#credential-secret_version').length).toBe(1);
+  });
+  test('should make the test request correctly when testing an existing credential', async () => {
+    wrapper = mountWithContexts(
+      <ExternalTestModal
+        credential={credential}
+        credentialType={credentialType}
+        credentialFormValues={credentialFormValues}
+        onClose={jest.fn()}
+      />
+    );
+    await act(async () => {
+      wrapper.find('input#credential-secret_path').simulate('change', {
+        target: { value: '/secret/foo/bar/baz', name: 'secret_path' },
+      });
+      wrapper.find('input#credential-secret_key').simulate('change', {
+        target: { value: 'password', name: 'secret_key' },
+      });
+    });
+    wrapper.update();
+    await act(async () => {
+      wrapper.find('Button[children="Run"]').simulate('click');
+    });
+    expect(CredentialsAPI.test).toHaveBeenCalledWith(1, {
+      inputs: {
+        api_version: 'v2',
+        cacert: undefined,
+        role_id: undefined,
+        secret_id: undefined,
+        token: '$encrypted$',
+        url: 'http://hashivault:8200',
+      },
+      metadata: {
+        auth_path: '',
+        secret_backend: '',
+        secret_key: 'password',
+        secret_path: '/secret/foo/bar/baz',
+        secret_version: '',
+      },
+    });
+  });
+  test('should make the test request correctly when testing a new credential', async () => {
+    wrapper = mountWithContexts(
+      <ExternalTestModal
+        credentialType={credentialType}
+        credentialFormValues={credentialFormValues}
+        onClose={jest.fn()}
+      />
+    );
+    await act(async () => {
+      wrapper.find('input#credential-secret_path').simulate('change', {
+        target: { value: '/secret/foo/bar/baz', name: 'secret_path' },
+      });
+      wrapper.find('input#credential-secret_key').simulate('change', {
+        target: { value: 'password', name: 'secret_key' },
+      });
+    });
+    wrapper.update();
+    await act(async () => {
+      wrapper.find('Button[children="Run"]').simulate('click');
+    });
+    expect(CredentialTypesAPI.test).toHaveBeenCalledWith(21, {
+      inputs: {
+        api_version: 'v2',
+        cacert: undefined,
+        role_id: undefined,
+        secret_id: undefined,
+        token: '$encrypted$',
+        url: 'http://hashivault:8200',
+      },
+      metadata: {
+        auth_path: '',
+        secret_backend: '',
+        secret_key: 'password',
+        secret_path: '/secret/foo/bar/baz',
+        secret_version: '',
+      },
+    });
+  });
+  test('should display the alert after a successful test', async () => {
+    CredentialTypesAPI.test.mockResolvedValue({});
+    wrapper = mountWithContexts(
+      <ExternalTestModal
+        credentialType={credentialType}
+        credentialFormValues={credentialFormValues}
+        onClose={jest.fn()}
+      />
+    );
+    await act(async () => {
+      wrapper.find('input#credential-secret_path').simulate('change', {
+        target: { value: '/secret/foo/bar/baz', name: 'secret_path' },
+      });
+      wrapper.find('input#credential-secret_key').simulate('change', {
+        target: { value: 'password', name: 'secret_key' },
+      });
+    });
+    wrapper.update();
+    await act(async () => {
+      wrapper.find('Button[children="Run"]').simulate('click');
+    });
+    wrapper.update();
+    expect(wrapper.find('Alert').length).toBe(1);
+    expect(wrapper.find('Alert').props().variant).toBe('success');
+  });
+  test('should display the alert after a failed test', async () => {
+    CredentialTypesAPI.test.mockRejectedValue({
+      inputs: `HTTP 404
+        {"errors":["no handler for route '/secret/foo/bar/baz'"]}
+      `,
+    });
+    wrapper = mountWithContexts(
+      <ExternalTestModal
+        credentialType={credentialType}
+        credentialFormValues={credentialFormValues}
+        onClose={jest.fn()}
+      />
+    );
+    await act(async () => {
+      wrapper.find('input#credential-secret_path').simulate('change', {
+        target: { value: '/secret/foo/bar/baz', name: 'secret_path' },
+      });
+      wrapper.find('input#credential-secret_key').simulate('change', {
+        target: { value: 'password', name: 'secret_key' },
+      });
+    });
+    wrapper.update();
+    await act(async () => {
+      wrapper.find('Button[children="Run"]').simulate('click');
+    });
+    wrapper.update();
+    expect(wrapper.find('Alert').length).toBe(1);
+    expect(wrapper.find('Alert').props().variant).toBe('danger');
+  });
+});
diff --git a/awx/ui_next/src/screens/Credential/shared/index.js b/awx/ui_next/src/screens/Credential/shared/index.js
index ad01a03c29..28dda5128a 100644
--- a/awx/ui_next/src/screens/Credential/shared/index.js
+++ b/awx/ui_next/src/screens/Credential/shared/index.js
@@ -1,2 +1,3 @@
 export { default as mockCredentials } from './data.credentials.json';
 export { default as mockCredentialType } from './data.credential_type.json';
+export { default as ExternalTestModal } from './ExternalTestModal';
diff --git a/awx/ui_next/src/util/useRequest.js b/awx/ui_next/src/util/useRequest.js
index 0e95be4a69..027e82f86f 100644
--- a/awx/ui_next/src/util/useRequest.js
+++ b/awx/ui_next/src/util/useRequest.js
@@ -38,6 +38,9 @@ export default function useRequest(makeRequest, initialValue) {
     request: useCallback(
       async (...args) => {
         setIsLoading(true);
+        if (isMounted.current) {
+          setError(null);
+        }
         try {
           const response = await makeRequest(...args);
           if (isMounted.current) {