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diff --git a/spec/frontend/ci/pipeline_mini_graph/legacy_pipeline_mini_graph_spec.js b/spec/frontend/ci/pipeline_mini_graph/legacy_pipeline_mini_graph_spec.js
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+++ b/spec/frontend/ci/pipeline_mini_graph/legacy_pipeline_mini_graph_spec.js
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+import { mount } from '@vue/test-utils';
+import { pipelines } from 'test_fixtures/pipelines/pipelines.json';
+import LegacyPipelineMiniGraph from '~/ci/pipeline_mini_graph/legacy_pipeline_mini_graph.vue';
+import PipelineStages from '~/ci/pipeline_mini_graph/pipeline_stages.vue';
+import mockLinkedPipelines from './linked_pipelines_mock_data';
+
+const mockStages = pipelines[0].details.stages;
+
+describe('Legacy Pipeline Mini Graph', () => {
+  let wrapper;
+
+  const findLegacyPipelineMiniGraph = () => wrapper.findComponent(LegacyPipelineMiniGraph);
+  const findPipelineStages = () => wrapper.findComponent(PipelineStages);
+
+  const findLinkedPipelineUpstream = () =>
+    wrapper.findComponent('[data-testid="pipeline-mini-graph-upstream"]');
+  const findLinkedPipelineDownstream = () =>
+    wrapper.findComponent('[data-testid="pipeline-mini-graph-downstream"]');
+  const findDownstreamArrowIcon = () => wrapper.find('[data-testid="downstream-arrow-icon"]');
+  const findUpstreamArrowIcon = () => wrapper.find('[data-testid="upstream-arrow-icon"]');
+
+  const createComponent = (props = {}) => {
+    wrapper = mount(LegacyPipelineMiniGraph, {
+      propsData: {
+        stages: mockStages,
+        ...props,
+      },
+    });
+  };
+
+  describe('rendered state without upstream or downstream pipelines', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('should render the pipeline stages', () => {
+      expect(findPipelineStages().exists()).toBe(true);
+    });
+
+    it('should have the correct props', () => {
+      expect(findLegacyPipelineMiniGraph().props()).toMatchObject({
+        downstreamPipelines: [],
+        isMergeTrain: false,
+        pipelinePath: '',
+        stages: expect.any(Array),
+        updateDropdown: false,
+        upstreamPipeline: undefined,
+      });
+    });
+
+    it('should have no linked pipelines', () => {
+      expect(findLinkedPipelineDownstream().exists()).toBe(false);
+      expect(findLinkedPipelineUpstream().exists()).toBe(false);
+    });
+
+    it('should not render arrow icons', () => {
+      expect(findUpstreamArrowIcon().exists()).toBe(false);
+      expect(findDownstreamArrowIcon().exists()).toBe(false);
+    });
+  });
+
+  describe('rendered state with upstream pipeline', () => {
+    beforeEach(() => {
+      createComponent({
+        upstreamPipeline: mockLinkedPipelines.triggered_by,
+      });
+    });
+
+    it('should have the correct props', () => {
+      expect(findLegacyPipelineMiniGraph().props()).toMatchObject({
+        downstreamPipelines: [],
+        isMergeTrain: false,
+        pipelinePath: '',
+        stages: expect.any(Array),
+        updateDropdown: false,
+        upstreamPipeline: expect.any(Object),
+      });
+    });
+
+    it('should render the upstream linked pipelines mini list only', () => {
+      expect(findLinkedPipelineUpstream().exists()).toBe(true);
+      expect(findLinkedPipelineDownstream().exists()).toBe(false);
+    });
+
+    it('should render an upstream arrow icon only', () => {
+      expect(findDownstreamArrowIcon().exists()).toBe(false);
+      expect(findUpstreamArrowIcon().exists()).toBe(true);
+      expect(findUpstreamArrowIcon().props('name')).toBe('long-arrow');
+    });
+  });
+
+  describe('rendered state with downstream pipelines', () => {
+    beforeEach(() => {
+      createComponent({
+        downstreamPipelines: mockLinkedPipelines.triggered,
+        pipelinePath: 'my/pipeline/path',
+      });
+    });
+
+    it('should have the correct props', () => {
+      expect(findLegacyPipelineMiniGraph().props()).toMatchObject({
+        downstreamPipelines: expect.any(Array),
+        isMergeTrain: false,
+        pipelinePath: 'my/pipeline/path',
+        stages: expect.any(Array),
+        updateDropdown: false,
+        upstreamPipeline: undefined,
+      });
+    });
+
+    it('should render the downstream linked pipelines mini list only', () => {
+      expect(findLinkedPipelineDownstream().exists()).toBe(true);
+      expect(findLinkedPipelineUpstream().exists()).toBe(false);
+    });
+
+    it('should render a downstream arrow icon only', () => {
+      expect(findUpstreamArrowIcon().exists()).toBe(false);
+      expect(findDownstreamArrowIcon().exists()).toBe(true);
+      expect(findDownstreamArrowIcon().props('name')).toBe('long-arrow');
+    });
+  });
+});