FIX: Allow headings to have the same label (#46)

Fixes an issue where multiple headings with the same value would remove
columns from displaying.

test/fixtures/md-table-fixture.js

@@ -1 +0,0 @@
-export default `|Make | Model | Year|\r\n|--- | --- | ---|\r\n|Toyota | Supra | 1998|\r\n|Nissan | Skyline | 1999|\r\n|Honda | S2000 | 2001|\r\n`;

test/fixtures/md-table-special-chars-fixture.js

@@ -1 +0,0 @@
-export default `|Make | Model | Price|\r\n|--- | --- | ---|\r\n|Toyota | Supra | $50,000|\r\n| | Celica | $20,000|\r\n|Nissan | GTR | $80,000|\r\n`;

test/fixtures/md-table.js

@@ -0,0 +1,3 @@
+export const mdTable = `|Make | Model | Year|\r\n|--- | --- | ---|\r\n|Toyota | Supra | 1998|\r\n|Nissan | Skyline | 1999|\r\n|Honda | S2000 | 2001|\r\n`;
+export const mdTableSpecialChars = `|Make | Model | Price|\r\n|--- | --- | ---|\r\n|Toyota | Supra | $50,000|\r\n| | Celica | $20,000|\r\n|Nissan | GTR | $80,000|\r\n`;
+export const mdTableNonUniqueHeadings = `|col1 | col2 | col1|\r\n|--- | --- | ---|\r\n|Col A | Col B | Col C|\r\n`;

test/unit/lib/utilities-test.js

@@ -1,7 +1,11 @@
 import { discourseModule } from "discourse/tests/helpers/qunit-helpers";
 import { test } from "qunit";
-import mdTableFixture from "../../fixtures/md-table-fixture";
-import mdTableSpecialCharsFixture from "../../fixtures/md-table-special-chars-fixture";
+import {
+  mdTable,
+  mdTableNonUniqueHeadings,
+  mdTableSpecialChars,
+} from "../../fixtures/md-table";
+
 import {
   arrayToTable,
   findTableRegex,
@@ -11,51 +15,80 @@ discourseModule("Unit | Utilities", function () {
   test("arrayToTable", function (assert) {
     const tableData = [
       {
-        Make: "Toyota",
-        Model: "Supra",
-        Year: "1998",
+        col0: "Toyota",
+        col1: "Supra",
+        col2: "1998",
       },
       {
-        Make: "Nissan",
-        Model: "Skyline",
-        Year: "1999",
+        col0: "Nissan",
+        col1: "Skyline",
+        col2: "1999",
       },
       {
-        Make: "Honda",
-        Model: "S2000",
-        Year: "2001",
+        col0: "Honda",
+        col1: "S2000",
+        col2: "2001",
       },
     ];
 
     assert.strictEqual(
-      arrayToTable(tableData),
-      mdTableFixture,
+      arrayToTable(tableData, ["Make", "Model", "Year"]),
+      mdTable,
       "it creates a markdown table from an array of objects (with headers as keys)"
     );
 
     const specialCharsTableData = [
       {
-        Make: "Toyota",
-        Model: "Supra",
-        Price: "$50,000",
+        col0: "Toyota",
+        col1: "Supra",
+        col2: "$50,000",
       },
       {
-        Make: "",
-        Model: "Celica",
-        Price: "$20,000",
+        col0: "",
+        col1: "Celica",
+        col2: "$20,000",
       },
       {
-        Make: "Nissan",
-        Model: "GTR",
-        Price: "$80,000",
+        col0: "Nissan",
+        col1: "GTR",
+        col2: "$80,000",
       },
     ];
 
     assert.strictEqual(
-      arrayToTable(specialCharsTableData),
-      mdTableSpecialCharsFixture,
+      arrayToTable(specialCharsTableData, ["Make", "Model", "Price"]),
+      mdTableSpecialChars,
       "it creates a markdown table with special characters in correct alignment"
     );
+
+    const nonUniqueColumns = ["col1", "col2", "col1"];
+
+    assert.strictEqual(
+      arrayToTable(
+        [{ col0: "Col A", col1: "Col B", col2: "Col C" }],
+        nonUniqueColumns
+      ),
+      mdTableNonUniqueHeadings,
+      "it does not suppress a column if heading is the same as another column"
+    );
+  });
+  test("arrayToTable with custom column prefix", function (assert) {
+    const tableData = [
+      {
+        A0: "hey",
+        A1: "you",
+      },
+      {
+        A0: "over",
+        A1: "there",
+      },
+    ];
+
+    assert.strictEqual(
+      arrayToTable(tableData, ["Col 1", "Col 2"], "A"),
+      `|Col 1 | Col 2|\r\n|--- | ---|\r\n|hey | you|\r\n|over | there|\r\n`,
+      "it works"
+    );
   });
 
   test("findTableRegex", function (assert) {