diff --git a/Cargo.lock b/Cargo.lock
index 4fe601ff45..f79f18c1de 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1483,8 +1483,10 @@ dependencies = [
  "leo-ast",
  "leo-ast-passes",
  "leo-compiler",
+ "leo-errors",
  "leo-imports",
  "leo-parser",
+ "regex",
  "serde",
  "serde_json",
  "serde_yaml",
diff --git a/errors/src/common/macros.rs b/errors/src/common/macros.rs
index 9dfa00f67c..54551c9b53 100644
--- a/errors/src/common/macros.rs
+++ b/errors/src/common/macros.rs
@@ -19,7 +19,13 @@
 /// with a unique error code.
 #[macro_export]
 macro_rules! create_errors {
-    (@step $_code:expr,) => {};
+    (@step $code:expr,) => {
+        #[inline(always)]
+        // Returns the number of unique exit codes that this error type can take on.
+        pub fn num_exit_codes() -> i32 {
+            $code
+        }
+    };
     ($(#[$error_type_docs:meta])* $error_type:ident, exit_code_mask: $exit_code_mask:expr, error_code_prefix: $error_code_prefix:expr, $($(#[$docs:meta])* @$formatted_or_backtraced_list:ident $names:ident { args: ($($arg_names:ident: $arg_types:ty$(,)?)*), msg: $messages:expr, help: $helps:expr, })*) => {
         #[allow(unused_imports)] // Allow unused for errors that only use formatted or backtraced errors.
         use crate::{BacktracedError, FormattedError, LeoErrorCode, Span};
@@ -63,6 +69,7 @@ macro_rules! create_errors {
             }
         }
 
+
         // Steps over the list of functions with an initial error code of 0.
         impl $error_type {
             create_errors!(@step 0i32, $(($(#[$docs])* $formatted_or_backtraced_list, $names($($arg_names: $arg_types,)*), $messages, $helps),)*);
@@ -112,5 +119,4 @@ macro_rules! create_errors {
         // Steps the error code value by one and calls on the rest of the functions.
         create_errors!(@step $code + 1i32, $(($(#[$docs])* $formatted_or_backtraced_tail, $names($($tail_arg_names: $tail_arg_types,)*), $messages, $helps),)*);
     };
-
 }
diff --git a/test-framework/Cargo.toml b/test-framework/Cargo.toml
index f32f3fe07a..bea2f59c5c 100644
--- a/test-framework/Cargo.toml
+++ b/test-framework/Cargo.toml
@@ -55,3 +55,11 @@ version = "1.5.2"
 
 [dependencies.structopt]
 version = "0.3"
+
+# List of dependencies for errcov
+[dependencies.leo-errors]
+path = "../errors"
+version = "1.5.3"
+
+[dependencies.regex]
+version = "1.5"
\ No newline at end of file
diff --git a/test-framework/src/bin/errcov.rs b/test-framework/src/bin/errcov.rs
new file mode 100644
index 0000000000..2d18415e71
--- /dev/null
+++ b/test-framework/src/bin/errcov.rs
@@ -0,0 +1,269 @@
+// Copyright (C) 2019-2021 Aleo Systems Inc.
+// This file is part of the Leo library.
+
+// The Leo library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// The Leo library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.
+
+use leo_errors::{
+    AsgError, AstError, CliError, CompilerError, ImportError, LeoErrorCode, PackageError, ParserError, StateError,
+};
+use leo_test_framework::{
+    fetch::find_tests,
+    output::TestExpectation,
+    test::{extract_test_config, TestExpectationMode as Expectation},
+};
+
+use regex::Regex;
+use serde_yaml::Value;
+use std::collections::{BTreeMap, HashSet};
+use std::{error::Error, fs, io, path::PathBuf};
+use structopt::{clap::AppSettings, StructOpt};
+
+#[derive(StructOpt)]
+#[structopt(name = "error-coverage", author = "The Aleo Team <hello@aleo.org>", setting = AppSettings::ColoredHelp)]
+struct Opt {
+    #[structopt(
+        short,
+        long,
+        help = "Path to the output file, defaults to stdout.",
+        parse(from_os_str)
+    )]
+    output: Option<PathBuf>,
+}
+
+fn main() {
+    handle_error(run_with_args(Opt::from_args()));
+}
+
+fn run_with_args(opt: Opt) -> Result<(), Box<dyn Error>> {
+    // Variable that stores all the tests.
+    let mut tests = Vec::new();
+    let mut test_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    test_dir.push("../tests/");
+
+    let mut expectation_dir = test_dir.clone();
+    expectation_dir.push("expectations");
+
+    find_tests(&test_dir, &mut tests);
+
+    // Store all covered error codes
+    let mut found_codes = BTreeMap::new();
+    let re = Regex::new(r"Error \[(?P<code>.*)\]:.*").unwrap();
+
+    for (path, content) in tests.into_iter() {
+        if let Some(config) = extract_test_config(&content) {
+            // Skip passing tests.
+            if config.expectation == Expectation::Pass {
+                continue;
+            }
+
+            let mut expectation_path = expectation_dir.clone();
+
+            let path = PathBuf::from(path);
+            let relative_path = path.strip_prefix(&test_dir).expect("path error for test");
+
+            let mut relative_expectation_path = relative_path.to_str().unwrap().to_string();
+            relative_expectation_path += ".out";
+
+            // Add expectation category
+            if relative_expectation_path.starts_with("compiler") {
+                expectation_path.push("compiler");
+            } else {
+                expectation_path.push("parser");
+            }
+            expectation_path.push(&relative_expectation_path);
+
+            if expectation_path.exists() {
+                let raw = std::fs::read_to_string(&expectation_path).expect("failed to read expectations file");
+                let expectation: TestExpectation =
+                    serde_yaml::from_str(&raw).expect("invalid yaml in expectations file");
+
+                for value in expectation.outputs {
+                    if let serde_yaml::Value::String(message) = value {
+                        if let Some(caps) = re.captures(&message) {
+                            if let Some(code) = caps.name("code") {
+                                let files = found_codes
+                                    .entry(code.as_str().to_string())
+                                    .or_insert_with(HashSet::new);
+                                let path = expectation_path
+                                    .strip_prefix(test_dir.clone())
+                                    .expect("invalid prefix for expectation path");
+                                files.insert(PathBuf::from(path));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    // Collect all defined error codes.
+    let mut all_codes = HashSet::new();
+    collect_error_codes(
+        &mut all_codes,
+        AsgError::error_type(),
+        AsgError::code_identifier(),
+        AsgError::exit_code_mask(),
+        AsgError::num_exit_codes(),
+    );
+    collect_error_codes(
+        &mut all_codes,
+        AstError::error_type(),
+        AstError::code_identifier(),
+        AstError::exit_code_mask(),
+        AstError::num_exit_codes(),
+    );
+    collect_error_codes(
+        &mut all_codes,
+        CliError::error_type(),
+        CliError::code_identifier(),
+        CliError::exit_code_mask(),
+        CliError::num_exit_codes(),
+    );
+    collect_error_codes(
+        &mut all_codes,
+        CompilerError::error_type(),
+        CompilerError::code_identifier(),
+        CompilerError::exit_code_mask(),
+        CompilerError::num_exit_codes(),
+    );
+    collect_error_codes(
+        &mut all_codes,
+        ImportError::error_type(),
+        ImportError::code_identifier(),
+        ImportError::exit_code_mask(),
+        ImportError::num_exit_codes(),
+    );
+    collect_error_codes(
+        &mut all_codes,
+        PackageError::error_type(),
+        PackageError::code_identifier(),
+        PackageError::exit_code_mask(),
+        PackageError::num_exit_codes(),
+    );
+    collect_error_codes(
+        &mut all_codes,
+        ParserError::error_type(),
+        ParserError::code_identifier(),
+        ParserError::exit_code_mask(),
+        ParserError::num_exit_codes(),
+    );
+    collect_error_codes(
+        &mut all_codes,
+        StateError::error_type(),
+        StateError::code_identifier(),
+        StateError::exit_code_mask(),
+        StateError::num_exit_codes(),
+    );
+
+    // Repackage data into values compatible with serde_yaml
+    let mut covered_errors = serde_yaml::Mapping::new();
+    let mut unknown_errors = serde_yaml::Mapping::new();
+
+    for (code, paths) in found_codes.iter() {
+        let mut yaml_paths = Vec::with_capacity(paths.len());
+        for path in paths {
+            yaml_paths.push(path.to_str().unwrap());
+        }
+        yaml_paths.sort_unstable();
+        let yaml_paths = yaml_paths.iter().map(|s| Value::String(s.to_string())).collect();
+
+        if all_codes.contains(code) {
+            covered_errors.insert(Value::String(code.to_owned()), Value::Sequence(yaml_paths));
+        } else {
+            unknown_errors.insert(Value::String(code.to_owned()), Value::Sequence(yaml_paths));
+        }
+        all_codes.remove(code);
+    }
+
+    let mut codes: Vec<String> = all_codes.drain().collect();
+    codes.sort();
+
+    let mut uncovered_errors = Vec::new();
+    for code in codes {
+        uncovered_errors.push(Value::String(code))
+    }
+
+    let mut uncovered_information = serde_yaml::Mapping::new();
+    uncovered_information.insert(
+        Value::String(String::from("count")),
+        Value::Number(serde_yaml::Number::from(uncovered_errors.len())),
+    );
+    uncovered_information.insert(Value::String(String::from("codes")), Value::Sequence(uncovered_errors));
+
+    let mut covered_information = serde_yaml::Mapping::new();
+    covered_information.insert(
+        Value::String(String::from("count")),
+        Value::Number(serde_yaml::Number::from(covered_errors.len())),
+    );
+    covered_information.insert(Value::String(String::from("codes")), Value::Mapping(covered_errors));
+
+    let mut unknown_information = serde_yaml::Mapping::new();
+    unknown_information.insert(
+        Value::String(String::from("count")),
+        Value::Number(serde_yaml::Number::from(unknown_errors.len())),
+    );
+    unknown_information.insert(Value::String(String::from("codes")), Value::Mapping(unknown_errors));
+
+    let mut results = serde_yaml::Mapping::new();
+    results.insert(
+        Value::String(String::from("uncovered")),
+        Value::Mapping(uncovered_information),
+    );
+
+    results.insert(
+        Value::String(String::from("covered")),
+        Value::Mapping(covered_information),
+    );
+    results.insert(
+        Value::String(String::from("unknown")),
+        Value::Mapping(unknown_information),
+    );
+
+    // Output error coverage results
+    if let Some(pathbuf) = opt.output {
+        let file = fs::File::create(pathbuf).expect("error creating output file");
+        serde_yaml::to_writer(file, &results).expect("serialization failed for error coverage report");
+    } else {
+        serde_yaml::to_writer(io::stdout(), &results).expect("serialization failed for error coverage report");
+    }
+
+    Ok(())
+}
+
+fn collect_error_codes(
+    codes: &mut HashSet<String>,
+    error_type: String,
+    code_identifier: i8,
+    exit_code_mask: i32,
+    num_exit_codes: i32,
+) {
+    for exit_code in 0..num_exit_codes {
+        codes.insert(format!(
+            "E{}{:0>3}{:0>4}",
+            error_type,
+            code_identifier,
+            exit_code_mask + exit_code,
+        ));
+    }
+}
+
+fn handle_error(res: Result<(), Box<dyn Error>>) {
+    match res {
+        Ok(_) => (),
+        Err(err) => {
+            eprintln!("Error: {}", err);
+            std::process::exit(1);
+        }
+    }
+}