diff --git a/src/utils/getColNumber.ts b/src/utils/getColNumber.ts
deleted file mode 100644
index 4333bd6..0000000
--- a/src/utils/getColNumber.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export const getColNumber = (statement: string, text: string): number => {
-  return (statement.split('\n').pop() as string).indexOf(text) + 1
-}
diff --git a/src/utils/getColumnNumber.spec.ts b/src/utils/getColumnNumber.spec.ts
new file mode 100644
index 0000000..7a4e405
--- /dev/null
+++ b/src/utils/getColumnNumber.spec.ts
@@ -0,0 +1,13 @@
+import { getColumnNumber } from './getColumnNumber'
+
+describe('getColumnNumber', () => {
+  it('should return the column number of the specified string within a line of text', () => {
+    expect(getColumnNumber('foo bar', 'bar')).toEqual(5)
+  })
+
+  it('should throw an error when the specified string is not found within the text', () => {
+    expect(() => getColumnNumber('foo bar', 'baz')).toThrowError(
+      "String 'baz' was not found in statement 'foo bar'"
+    )
+  })
+})
diff --git a/src/utils/getColumnNumber.ts b/src/utils/getColumnNumber.ts
new file mode 100644
index 0000000..8d42dfd
--- /dev/null
+++ b/src/utils/getColumnNumber.ts
@@ -0,0 +1,9 @@
+export const getColumnNumber = (statement: string, text: string): number => {
+  const index = (statement.split('\n').pop() as string).indexOf(text)
+  if (index < 0) {
+    throw new Error(
+      `String '${text}' was not found in statement '${statement}'`
+    )
+  }
+  return (statement.split('\n').pop() as string).indexOf(text) + 1
+}