Simplify and generalize template processing

"For the unit tests. For the unit tests!"

1 files changed, 47 insertions, 0 deletions

diff --git a/src/templates.test.ts b/src/templates.test.ts
new file mode 100644
index 0000000..1fb88b7
--- /dev/null
+++ b/src/templates.test.ts
@@ -0,0 +1,47 @@
+import processTemplate, { Template } from "./templates";
+import path from "path";
+import fs from "fs";
+
+const genTemplate = (filename: string): Template =>
+  ({
+    inputFile: path.join(__dirname, "..", "example_reports", filename),
+    outputFile: path.join(
+      __dirname,
+      "..",
+      "build",
+      filename.replace(/template/, "txt")
+    ),
+    context: { that: "this", potential: "resolved" }
+  } as Template);
+
+describe("processTemplate", () => {
+  beforeAll(() =>
+    fs.promises.mkdir(path.join(__dirname, "..", "build")).catch(() => null)
+  );
+
+  it("should process the template file with the given context", async () => {
+    // Arrange
+    const template = genTemplate("ex.template");
+
+    // Act
+    const result = await processTemplate(template);
+
+    // Assert
+    expect(result.data).not.toBeNull();
+    expect(result.data).toEqual("But what is this other than resolved?");
+    expect(fs.existsSync(result.outputFile)).toEqual(true);
+  });
+
+  it("should process the blank file", async () => {
+    // Arrange
+    const template = genTemplate("blank.template");
+
+    // Act
+    const result = await processTemplate(template);
+
+    // Assert
+    expect(result.data).not.toBeNull();
+    expect(result.data).toEqual("");
+    expect(fs.existsSync(result.outputFile)).toEqual(true);
+  });
+});